Toolkit · Antitrust

The Antitrust and Competition Toolkit

15 U.S.C. §§ 1

Type
Toolkit
Jurisdiction
National
Date
2026-07-21
Topic
Antitrust

This toolkit is the front door to antitrust on UpLaw. It maps competition law as eleven pillars — the statutory framework of the Sherman, Clayton, and FTC Acts; horizontal agreements and the per se offenses; information exchange and trade associations; vertical restraints and distribution; monopolization and dominant-firm conduct; mergers and HSR clearance; the IP-antitrust intersection; labor-market restraints; criminal enforcement and leniency; private treble-damages litigation and class actions; and compliance programs. Each pillar gives you the plain-English doctrine, the controlling authority, the traps that catch sophisticated companies, and links into UpLaw's deeper guides and checklists. A running example follows Thornwood Machine Works, a fictional industrial pump manufacturer, as its growth and acquisitions touch every pillar in turn. Antitrust punishes conduct that looks like ordinary commercial good sense, which is exactly why the map matters more here than almost anywhere else in the law.

The Antitrust and Competition Toolkit

Antitrust > Competition Law | Published 21 July 2026 - Updated 18 August 2026 | UpLaw - uplaw.us

Antitrust is the body of law most likely to make a felon out of someone who thought they were being a good salesperson. Its core prohibitions are barely a page of statute; everything else is a century of judicial gloss about what "unreasonable" means. This toolkit is the map through it.

Keywords: antitrust, Sherman Act, Clayton Act, FTC Act, per se rule, rule of reason, price fixing, bid rigging, market allocation, information exchange, vertical restraints, monopolization, merger review, Hart-Scott-Rodino, no-poach, leniency, treble damages, Illinois Brick, antitrust compliance

How to read this toolkit

Antitrust is not one subject. It is eleven loosely federated subjects that share three short statutes and almost nothing else. The doctrine that governs a cartel meeting in a hotel room has virtually nothing in common with the doctrine that governs a merger clearance, which has nothing in common with the doctrine that governs a dominant platform's refusal to deal. Each has its own test, its own burden of proof, its own enforcement agency posture, and its own catastrophic failure mode.

This toolkit walks those eleven pillars in the order a company actually encounters them. It is a research map, not a treatise. Each pillar gives you the plain-English doctrine, the anchor authority, the traps that catch even well-advised companies, and a link into UpLaw's deeper treatment where the real detail lives. For the doctrinal foundation beneath everything below, keep Antitrust Law: A Comprehensive Guide to the Sherman, Clayton, and FTC Acts open in the next tab.

Use it three ways. Read it end to end once, to build the mental model of how competition law fits together. Jump to a pillar when you have a live question — "can we join this benchmarking survey?", "does this deal need an HSR filing?", "is this exclusive distributor arrangement safe?" — and follow the deep-dive links. Or use the consolidated gated checklist near the end as an audit of a company, a transaction, or a course of conduct.

A running example keeps it concrete. Meet Thornwood Machine Works, a fictional maker of industrial pumps and valves for water-treatment plants. Thornwood starts as a regional player with 12% share, grows into the national number two, acquires a rival, licenses a patented seal design, hires aggressively from competitors, and eventually finds itself on the receiving end of a grand jury subpoena and a putative class action. By the end of this toolkit, Thornwood will have touched every pillar of antitrust law — some deliberately, most by accident.

Before you rely on anything in this toolkit: two currency warnings

First, the numbers move. Antitrust is unusually full of figures that are re-set on a schedule, and every one of them is wrong the moment it is printed. The Hart-Scott-Rodino size-of-transaction and size-of-person thresholds, the HSR filing-fee tiers, and the per-day civil penalty for gun-jumping and for failure to file are adjusted annually — typically announced in the first quarter and effective some weeks later. The Merger Guidelines have been rewritten three times in twenty years. Sherman Act fine caps interact with the alternative-fines statute. Where a deal touches foreign parties, the surrounding regimes are worse: tariff schedules, export-control lists, and OFAC sanctions designations change constantly, sometimes weekly, and are frequently amended without notice. Treat every dollar figure, threshold, percentage, and list in this document as illustrative of the shape of the rule, never as the operative number. Pull the current figure from the agency's own published notice on the day you act. A deal cleared against last year's threshold is a deal that did not clear.

Second, agency guidance is not law — and it is worth less than it used to be. The Merger Guidelines, the IP Licensing Guidelines, the HR Guidance, the compliance-evaluation guidance, and the FTC's § 5 policy statement are statements of enforcement intent. They tell you what the staff reviewing your conduct will ask, which is enormously useful and is why this toolkit cites them. They do not bind a court. That has always been true in form; it is emphatically true in substance now that Chevron deference has been overruled. Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), holds that courts must exercise independent judgment in deciding what a statute means and may not defer to an agency's interpretation merely because the statute is ambiguous — an agency's reasoning earns only the persuasive weight it actually deserves, in the Skidmore sense. Do not tell a client that a practice is safe "because the guidelines say so," and do not assume a court will accept the agencies' reading of § 7 or of "unfair methods of competition." Conversely, do not assume the guidelines are toothless: they still describe the investigation you will actually face, and surviving an agency review is the practical question long before a court is ever involved. Related administrative-law currency: Corner Post, Inc. v. Board of Governors, 603 U.S. 799 (2024) (APA limitations run from the plaintiff's own injury), and SEC v. Jarkesy, 603 U.S. 109 (2024) (Seventh Amendment jury right for civil penalties adjudicated in-house) are reshaping how and when agency action can be attacked.

The competition landscape at a glance

  1. The statutes — Sherman §§ 1 and 2, Clayton §§ 3, 4, 7, and 16, and FTC Act § 5. Three statutes, two agencies, fifty states, and a private bar. (15 U.S.C. §§ 1, 2, 14, 15, 18, 26, 45)
  2. Horizontal agreements — Agreements among competitors. Price fixing, bid rigging, and market allocation are per se unlawful and criminal. Everything else gets the rule of reason. (Socony-Vacuum; Topco)
  3. Information exchange — Sharing prices, wages, capacity, or costs with competitors. The most under-appreciated exposure in the entire field. (Container Corp.)
  4. Vertical restraints — Restraints up and down the distribution chain: resale price maintenance, territories, exclusive dealing, tying. Nearly all rule of reason since Leegin. (Sylvania; Leegin; Tampa Electric)
  5. Monopolization — Sherman § 2. Monopoly power plus exclusionary conduct. Having a monopoly is legal; keeping it the wrong way is not. (Grinnell; Trinko; Microsoft)
  6. Mergers and HSR — Clayton § 7's "may be substantially to lessen competition" standard, and the premerger notification machinery that enforces it. (15 U.S.C. §§ 18, 18a; 2023 Merger Guidelines)
  7. IP and antitrust — Licensing, standard-essential patents and FRAND, patent pools, and reverse-payment settlements. (Actavis; Illinois Tool Works)
  8. Labor markets — No-poach, wage-fixing, and non-competes. The newest criminal frontier, and mostly state law at the edges.
  9. Criminal enforcement and leniency — Felony exposure, the Antitrust Division's Leniency Policy, and the race to be first in the door.
  10. Private litigation — Treble damages under Clayton § 4, antitrust injury, the Illinois Brick indirect-purchaser bar, and Rule 23 class actions.
  11. Compliance — The program that keeps the other ten pillars from becoming your problem.

Pillar 1 — The statutes: Sherman, Clayton, FTC Act

Federal antitrust rests on three statutes that between them run to a few thousand words.

Sherman Act § 1 (15 U.S.C. § 1) condemns "[e]very contract, combination ... or conspiracy, in restraint of trade." Read literally, that would void every contract ever written, so the Supreme Court read in a reasonableness limit almost immediately: only unreasonable restraints are unlawful. Standard Oil Co. of New Jersey v. United States, 221 U.S. 1 (1911). Section 1 has exactly two elements that matter: (1) an agreement — a "conscious commitment to a common scheme" — and (2) an unreasonable restraint. Unilateral conduct, however aggressive, is not a § 1 violation. Neither is a parent conspiring with its wholly owned subsidiary, which is legally a single actor. Copperweld Corp. v. Independence Tube Corp., 467 U.S. 752 (1984). But separately owned entities do not escape § 1 merely by organizing themselves as a joint venture. American Needle, Inc. v. National Football League, 560 U.S. 183 (2010).

Sherman Act § 2 (15 U.S.C. § 2) condemns monopolization, attempted monopolization, and conspiracy to monopolize. It is the only federal antitrust provision that reaches purely unilateral conduct.

Clayton Act supplies the civil machinery. Section 7 (15 U.S.C. § 18) reaches mergers and acquisitions whose effect "may be substantially to lessen competition, or to tend to create a monopoly" — an incipiency standard, deliberately looser than the Sherman Act's. Section 3 (15 U.S.C. § 14) reaches tying and exclusive dealing in goods. Section 4 (15 U.S.C. § 15) gives private plaintiffs treble damages, costs, and attorney's fees. Section 16 (15 U.S.C. § 26) gives private plaintiffs injunctive relief on a lighter showing. The Robinson-Patman Act (15 U.S.C. § 13) prohibits certain forms of price discrimination; long dormant, it has drawn renewed FTC interest and should not be assumed dead.

FTC Act § 5 (15 U.S.C. § 45) prohibits "unfair methods of competition." It reaches everything the Sherman and Clayton Acts reach and, on the Commission's view, a penumbra beyond them — but it carries no private right of action. The FTC's competition authority and its consumer-protection authority share a statutory home; for the deceptive-practices half of § 5, see Advertising Law: A Comprehensive Guide to the FTC Act and Lanham Act.

Who enforces. The DOJ Antitrust Division (civil and criminal), the FTC (civil only), state attorneys general (under both federal law and their own statutes — California's Cartwright Act, New York's Donnelly Act, and so on), and private plaintiffs. Assume all four are watching the same conduct.

Federal law is not the whole answer. The Sherman, Clayton, and FTC Acts are federal, and this toolkit is a map of federal doctrine. But every state has its own antitrust statute, and several of them are materially stricter than federal law — most notably on minimum resale price maintenance (per se in California and some other states notwithstanding Leegin) and on indirect-purchaser standing (repealer statutes displacing Illinois Brick). Adjacent bodies of law that interact constantly with competition counseling — employee non-competes, unfair-competition and "little FTC Act" claims, trade-secret protection, insurance regulation of rate-setting, and the tort surround of a competitor's business-disparagement or interference claims — are overwhelmingly state law and genuinely diverge from state to state. Nothing in this document should be read as stating a single nationwide rule on any of them. Where a practice will be rolled out in more than one state, the federal answer is the beginning of the analysis, not the end: confirm each state's rule before you act.

Immunities. Two matter. Noerr-Pennington immunizes genuine petitioning of government, including litigation and lobbying, subject to a narrow "sham" exception. Eastern Railroad Presidents Conference v. Noerr Motor Freight, Inc., 365 U.S. 127 (1961); Professional Real Estate Investors, Inc. v. Columbia Pictures Industries, Inc., 508 U.S. 49 (1993). The state action doctrine immunizes conduct that is clearly articulated state policy and actively supervised by the state. Parker v. Brown, 317 U.S. 341 (1943); California Retail Liquor Dealers Ass'n v. Midcal Aluminum, Inc., 445 U.S. 97 (1980). Both are narrower than clients hope: a state licensing board controlled by active market participants gets no immunity absent active state supervision. North Carolina State Board of Dental Examiners v. FTC, 574 U.S. 494 (2015).

Pillar 2 — Horizontal agreements and the per se offenses

Everything in antitrust begins with a single question: is this an agreement with a competitor? If yes, the analysis is dangerous. If no, it is usually survivable.

The per se offenses. Three categories of naked horizontal agreement are conclusively unlawful — no market definition, no market power showing, no procompetitive justification, no defense:

Offense What it is Example
Price fixing Any agreement that raises, lowers, stabilizes, or pegs price, or any component of price Agreeing on a fuel surcharge, a discount ceiling, or credit terms
Bid rigging Allocating who wins which bid; complementary or courtesy bidding; bid suppression "You take the Fresno contract, we'll take Bakersfield"
Market allocation Dividing customers, territories, or product lines Agreeing not to solicit each other's accounts

United States v. Socony-Vacuum Oil Co., 310 U.S. 150 (1940), holds price fixing per se unlawful and makes clear that agreements to stabilize price count, that a reasonable price is no defense, and that market power is irrelevant. United States v. Topco Associates, Inc., 405 U.S. 596 (1972), and Palmer v. BRG of Georgia, Inc., 498 U.S. 46 (1990) (per curiam), do the same for market allocation — Palmer holding that an allocation is per se unlawful even between firms with no market power.

The rule of reason governs everything else: joint ventures, standard-setting, research collaborations, group purchasing, joint selling. The burden shifts. The plaintiff must define a relevant market and show substantial anticompetitive effect; the defendant offers a procompetitive justification; the plaintiff shows a less restrictive alternative or that harms outweigh benefits. Ohio v. American Express Co., 585 U.S. 529 (2018), restates that framework and — for two-sided transaction platforms — requires the relevant market to include both sides.

The middle ground. A genuine integration can rescue what would otherwise be per se conduct. In Broadcast Music, Inc. v. Columbia Broadcasting System, Inc., 441 U.S. 1 (1979), a blanket license set a single price for millions of compositions and was still not per se unlawful, because the license created a genuinely new product. Texaco Inc. v. Dagher, 547 U.S. 1 (2006), holds that a legitimate joint venture setting the price of its own product is not price fixing at all. Conversely, NCAA v. Board of Regents, 468 U.S. 85 (1984), applied an abbreviated "quick look" to output restraints by a joint venture with obvious anticompetitive tendencies.

Proving agreement. Parallel conduct alone is not enough. Theatre Enterprises, Inc. v. Paramount Film Distributing Corp., 346 U.S. 537 (1954). A plaintiff must offer evidence "that tends to exclude the possibility of independent action," Monsanto Co. v. Spray-Rite Service Corp., 465 U.S. 752 (1984), and at the pleading stage must allege enough "plus factors" to make agreement plausible rather than merely conceivable, Bell Atlantic Corp. v. Twombly, 550 U.S. 544 (2007).

Thornwood. At a trade show, a Thornwood regional sales manager and his counterpart at a rival grumble over drinks about "irrational discounting" in the Midwest, and agree to "hold the line at list minus ten." No contract, no follow-through, no memo. That is a completed criminal felony under § 1 the moment the words are spoken. Thornwood's general counsel will not learn of it for four years — from a grand jury subpoena.

Deep dives: Antitrust Law: A Comprehensive Guide to the Sherman, Clayton, and FTC Acts and Antitrust Compliance: A Practical Checklist.

Pillar 3 — Information exchange, benchmarking, and trade associations

This is where good companies get into trouble. No one at Thornwood would agree to fix prices. Plenty of people at Thornwood would happily join an industry benchmarking survey that reports average realized pricing by region, or share a "market intelligence" spreadsheet with a competitor over lunch.

Information exchange among competitors is not per se unlawful. It is analyzed under the rule of reason — but it can supply the plus factor that converts parallel pricing into an inferred agreement, and a sufficiently rich exchange can itself be an unreasonable restraint. United States v. Container Corp. of America, 393 U.S. 333 (1969), found a § 1 violation where competitors in a concentrated market reciprocally exchanged recent, specific price information on request, even without any agreement on price. Contrast Maple Flooring Manufacturers Ass'n v. United States, 268 U.S. 563 (1925), where aggregated, historical, publicly disseminated statistics survived.

The risk factors are consistent and easy to teach:

  • Concentration. The fewer the players, the more dangerous the exchange.
  • Current or forward-looking data is far riskier than historical data.
  • Company-specific and disaggregated is far riskier than aggregated and anonymized.
  • Price, cost, wages, capacity, and output are the sensitive categories. Safety records and technical standards are not.
  • Public dissemination cuts in favor; a closed competitor-only channel cuts sharply against.

A currency warning. For decades, counsel relied on the DOJ/FTC healthcare policy statements — particularly the "safety zone" for information exchanges administered by a neutral third party using aggregated, three-months-stale data from at least five participants. The agencies withdrew those statements in 2023. Do not cite the safety zone as a compliance rule. It is at best a description of factors the agencies once found comforting; it is no longer agency policy.

The algorithmic frontier. The agencies' current position is that using a common pricing algorithm or a shared data-pooling service to align prices does not escape § 1 because a machine, rather than a person, did the coordinating — the phrase they use is that an agreement is unlawful whether it is reached "in a smoke-filled room or over an algorithm." Litigation over rent-setting and hospitality revenue-management software is testing that theory now, and the case law is unsettled. Treat any arrangement in which competitors feed nonpublic data into a shared pricing engine, and take outputs from it, as a live § 1 exposure requiring counsel.

Thornwood. Thornwood's trade association circulates a quarterly "Pump Pricing Index." Members submit current quoted prices by SKU; the association returns a table showing each member's submissions, unaggregated, labeled by company. That is Container Corp. with extra steps. Fix: aggregate, anonymize, lag the data by at least a quarter, require a minimum number of contributors, run it through an independent administrator, and publish it. Then have antitrust counsel bless it in writing — and put a lawyer in the room at every association meeting.

Pillar 4 — Vertical restraints and distribution

Restraints between firms at different levels of the chain — manufacturer and distributor, supplier and retailer — are analyzed far more permissively than horizontal restraints, because they usually make distribution work better rather than worse.

Resale price maintenance. A manufacturer telling a retailer what to charge is judged under the rule of reason, not per se. Leegin Creative Leather Products, Inc. v. PSKS, Inc., 551 U.S. 877 (2007), overruled the century-old per se rule of Dr. Miles Medical Co. v. John D. Park & Sons Co., 220 U.S. 373 (1911). Maximum RPM had already been moved to the rule of reason in State Oil Co. v. Khan, 522 U.S. 3 (1997). But: a number of states — California most prominently, under the Cartwright Act — continue to treat minimum RPM as per se unlawful under state law. A nationwide RPM program that is lawful federally can still be a state-law violation. Confirm state by state before rolling one out.

Non-price vertical restraints — exclusive territories, customer restrictions, location clauses — are rule of reason. Continental T.V., Inc. v. GTE Sylvania Inc., 433 U.S. 36 (1977).

Unilateral refusal to deal. A manufacturer may announce a resale price policy and refuse to sell to those who do not follow it, without ever forming an agreement — the Colgate doctrine, from United States v. Colgate & Co., 250 U.S. 300 (1919). It is a genuine safe harbor and a genuine trap: the moment the manufacturer negotiates compliance, extracts a promise, or reinstates a terminated dealer after assurances, there is an agreement and Colgate evaporates.

Exclusive dealing is lawful unless it forecloses a substantial share of the relevant market, considering the duration and the availability of alternatives. Tampa Electric Co. v. Nashville Coal Co., 365 U.S. 320 (1961). Rough working rule: short-term, terminable, low-foreclosure arrangements are safe; long, hard-to-exit contracts covering a large share of a concentrated market are not.

Tying — conditioning the sale of a desired product on the purchase of a second — requires separate products, coercion, market power in the tying product, and a not-insubstantial amount of commerce affected. Jefferson Parish Hospital District No. 2 v. Hyde, 466 U.S. 2 (1984). Importantly, holding a patent no longer creates any presumption of market power. Illinois Tool Works Inc. v. Independent Ink, Inc., 547 U.S. 28 (2006).

Thornwood. Thornwood wants its distributors to stop discounting below MSRP, wants each distributor locked to a territory, and wants water-treatment OEMs to buy Thornwood's proprietary seals with every pump. Federally, the first two are rule of reason and probably fine at Thornwood's share; the seal requirement is a tying claim waiting to happen if Thornwood has market power in pumps. And the RPM program is per se unlawful in California regardless of Leegin.

Pillar 5 — Monopolization and dominant-firm conduct

Section 2 has two elements: (1) monopoly power in a relevant market, and (2) the willful acquisition or maintenance of that power, as distinguished from growth or development as a consequence of a superior product, business acumen, or historic accident. United States v. Grinnell Corp., 384 U.S. 563 (1966).

The second element does all the work. As Verizon Communications Inc. v. Law Offices of Curtis V. Trinko, LLP, 540 U.S. 398 (2004), put it, "[t]he mere possession of monopoly power, and the concomitant charging of monopoly prices, is not only not unlawful; it is an important element of the free-market system." Antitrust does not punish success. It punishes exclusion.

Recurring theories of exclusionary conduct:

Attempted monopolization requires specific intent to monopolize, predatory or anticompetitive conduct, and a dangerous probability of achieving monopoly power — which means you still have to define a market and show real power. Spectrum Sports, Inc. v. McQuillan, 506 U.S. 447 (1993).

The single most useful modern treatment of § 2 conduct is United States v. Microsoft Corp., 253 F.3d 34 (D.C. Cir. 2001) (en banc), which supplies the burden-shifting sequence courts now use: plaintiff shows anticompetitive effect; defendant offers a procompetitive justification; plaintiff rebuts or shows the harm outweighs the benefit — and refuses to let a monopolist excuse exclusionary conduct with an after-the-fact rationalization.

Thornwood. By year eight Thornwood holds 68% of the market for high-pressure municipal water-treatment pumps. It launches a loyalty rebate: buy 90% of your annual pump requirement from Thornwood and get 14% back. It also refuses to sell replacement seals to independent service shops that repair Thornwood pumps. The rebate is an exclusive-dealing/foreclosure question. The seal refusal is a Kodak aftermarket problem sitting on top of an Aspen Skiing refusal-to-deal problem — made worse because Thornwood used to sell those seals happily and profitably.

Pillar 6 — Mergers and HSR clearance

Clayton § 7 prohibits acquisitions whose effect "may be substantially to lessen competition, or to tend to create a monopoly." 15 U.S.C. § 18. The verb is may: § 7 is an incipiency statute, designed to arrest anticompetitive trends "in their incipiency." Brown Shoe Co. v. United States, 370 U.S. 294 (1962). A merger producing an undue share in a concentrated market, with a significant increase in concentration, is presumptively unlawful. United States v. Philadelphia National Bank, 374 U.S. 321 (1963).

The 2023 DOJ/FTC Merger Guidelines are the agencies' operative analytical framework. They restore a stronger structural presumption (broadly, a highly concentrated post-merger market plus a meaningful increase in concentration, or a merged-firm share above roughly 30% with a meaningful HHI increase), and they extend beyond simple horizontal overlap to vertical foreclosure, serial acquisitions and roll-ups, potential and nascent competition, multi-sided platforms, and labor-market effects. Guidelines are not law and courts are not bound by them — a point with real bite after Loper Bright, which forecloses any argument that a court owes the agencies deference on what "may be substantially to lessen competition" means. But they tell you exactly what the staff reviewing your deal will ask, and that is the review you have to survive first. Merger guidelines, thresholds, and fee tiers change; confirm the version and the figures in force when your deal is signed, and again when you file.

Hart-Scott-Rodino. 15 U.S.C. § 18a and 16 C.F.R. Parts 801–803 require premerger notification of transactions above statutory thresholds and impose a waiting period before closing (generally 30 days; 15 for cash tender offers and certain bankruptcy sales). The size-of-transaction and size-of-person thresholds and the filing fees are adjusted annually and take effect on a date the FTC announces — never quote last year's number, and never quote a number you read in a secondary source, including this one. Confirm the figure in the FTC's operative notice as of your filing date. The same caution applies with even more force to anything cross-border: if the deal implicates foreign acquirers, controlled technology, or sanctioned parties, the CFIUS, export-control, and OFAC overlays move on their own schedules and must be checked contemporaneously. The HSR form itself was substantially expanded by rule effective in 2025, and now demands materially more narrative, deal-rationale documents, overlap descriptions, and prior-acquisition history than the legacy form.

Three traps kill deals:

  1. The Item 4(c)/4(d) documents. Deal-rationale documents prepared by or for officers and directors get produced. The synergy deck that says "eliminates our only real competitor on price" will be the government's Exhibit 1. Discipline the deal team's vocabulary from day one — this is a diligence-phase problem, not a filing-phase problem.
  2. Gun-jumping. Coordinating pricing, allocating customers, or transferring operational control before the waiting period expires is both an HSR violation (civil penalties accrue per day, at an inflation-adjusted rate that now exceeds $50,000 a day — confirm the current amount) and, potentially, a Sherman § 1 violation between still-independent competitors.
  3. Non-reportable deals are not exempt from § 7. Falling under the HSR threshold means you need not file. It does not mean the deal is lawful. The agencies and private plaintiffs can, and do, challenge consummated non-reportable transactions.

Deep dives: Merger Review and HSR Clearance: A Comprehensive Guide for the substantive law and the Second Request process; Filing an HSR Notification: A Practical Checklist for the mechanics. For the deal itself, see Mergers and Acquisitions: A Comprehensive Guide from Letter of Intent to Closing, The Mergers and Acquisitions Toolkit, and Conducting Merger and Acquisition Due Diligence: A Practical Checklist.

Thornwood. Thornwood agrees to acquire Verrick Pump Co., the number-three player, for $310 million. The deal is reportable. The combined share in high-pressure municipal pumps is 74%. Thornwood's CEO wrote an email calling Verrick "the only thing standing between us and real pricing power." That email is responsive to Item 4(c). Expect a Second Request.

Pillar 7 — IP and antitrust: licensing, SEPs, and patent settlements

Patents confer a right to exclude; antitrust condemns exclusion. The two regimes coexist by treating IP as ordinary property for antitrust purposes — valuable, but not immunizing.

Licensing. Under the DOJ/FTC Antitrust Guidelines for the Licensing of Intellectual Property, licensing is presumptively procompetitive: it moves technology to those who can use it. Field-of-use, territorial, and exclusive licenses are generally rule of reason. Danger appears when license terms become a vehicle for horizontal coordination among competing licensees — cross-licenses or pools that fix downstream prices or allocate markets get analyzed as what they functionally are. And a patent no longer implies market power for tying purposes. Illinois Tool Works. For structure and drafting, see Intellectual Property Licensing: A Comprehensive Guide to Structuring and Negotiating License Agreements.

Standard-essential patents and FRAND. Where a patent is declared essential to a standard and the holder promised to license on fair, reasonable, and nondiscriminatory terms, the antitrust question is whether reneging on that promise — or deceiving the standards body to get the patent read into the standard — constitutes exclusionary conduct. Courts have been cautious: the Ninth Circuit's decision in FTC v. Qualcomm Inc., 969 F.3d 974 (9th Cir. 2020), reversed a sweeping § 2 judgment and emphasized that hypercompetitive licensing conduct and breach of a FRAND commitment are not automatically antitrust violations. Note also that the federal agencies' joint policy statement on SEP remedies was withdrawn in 2022 and has not been replaced — this space is governed by contract law, patent law, and case-by-case § 2 analysis, not by an agency framework. See Standard-Essential Patents and FRAND Licensing in the 5G and IoT Era.

Reverse-payment settlements. A branded manufacturer paying a generic challenger to abandon a patent suit and stay off the market is not immune merely because the patent might have blocked entry anyway. FTC v. Actavis, Inc., 570 U.S. 136 (2013), holds such settlements neither presumptively lawful nor per se unlawful; they are judged under the rule of reason, with a large and otherwise-unexplained payment serving as a proxy for the patentee's own doubts about its patent's strength.

Thornwood. Thornwood licenses its patented ceramic seal to two competitors — but the license fixes the price at which licensees may sell finished pumps. That is not patent licensing; that is horizontal price fixing dressed in a patent. And when a rival challenges the seal patent, Thornwood settles by paying the rival $9 million to withdraw and stay out for three years. That is Actavis, and the payment is the evidence.

Pillar 8 — Labor markets: no-poach, wage-fixing, and non-competes

The buy side of the labor market is a market. Agreements among employers not to hire each other's people, or to fix wages, are horizontal restraints among competitors for labor, and the agencies have treated naked versions of them as per se unlawful and criminally prosecutable since the 2016 DOJ/FTC Antitrust Guidance for Human Resource Professionals.

Two hard truths:

  1. Naked no-poach and wage-fixing agreements are per se offenses. No market power showing, no defense. DOJ has charged them criminally. Results have been genuinely mixed — several early trials produced acquittals on the § 1 counts, and some courts have questioned whether no-poach agreements are properly per se — but DOJ has also obtained guilty pleas, and the civil and reputational exposure is severe regardless of criminal outcome. Do not read the acquittals as a green light.
  2. Ancillary restraints are different. A no-hire covenant that is reasonably necessary to a legitimate collaboration — a joint venture, an M&A transaction, a services agreement — is judged under the rule of reason. The distinction between naked and ancillary is the whole ballgame. Keep no-hire clauses narrow, time-limited, tied to the people actually working on the collaboration, and documented as necessary to a real integration.

Employee non-competes are a different animal: they are vertical (employer-employee), not horizontal, and they are overwhelmingly a matter of state law. California, Minnesota, North Dakota, and Oklahoma void them almost entirely; most states enforce reasonable ones. The FTC's 2024 rule that would have banned most non-competes nationwide was set aside by a federal district court before its effective date and never took effect — do not advise clients that non-competes are federally banned. For the current patchwork, see The Future of Non-Competes: FTC Rulemaking and the State-Law Patchwork; for the employment-law surround, The Employment Law Toolkit: From Hiring to Separation; and where departing employees carry information rather than customers, Protecting Trade Secrets When Employees Leave: A Practical Checklist.

Thornwood. Thornwood's VP of HR and a peer at a rival agree by text not to "raid each other's welders." That is a naked no-poach — a per se offense, and the text message is the whole case. Separately, Thornwood's acquisition agreement with Verrick contains a two-year no-hire covering the 40 engineers on the integration team. That one is ancillary, narrow, and defensible.

Pillar 9 — Criminal enforcement, leniency, and individual exposure

A Sherman Act § 1 violation is a felony. Individuals face up to 10 years' imprisonment and a fine up to $1 million; corporations face up to $100 million — and under the alternative fine statute, 18 U.S.C. § 3571(d), the fine may instead be twice the gross gain or twice the gross loss, which in a real cartel case dwarfs the statutory cap. Cartel conduct also routinely brings obstruction, false statements, and wire fraud charges. See White-Collar Crime and Corporate Criminal Liability: A Comprehensive Guide.

The Leniency Policy. The Antitrust Division's Leniency Program — substantially revised in 2022 — gives complete immunity from criminal prosecution to the first company (and its cooperating employees) to report a cartel, subject to strict conditions: the Division must not already have information likely to result in a sustained conviction; the company must promptly self-report upon discovery; must provide full, continuing, timely cooperation; must not have coerced others into the conspiracy or been the ringleader; and must make restitution to victims. There is exactly one leniency slot. Everyone else pleads.

Under ACPERA (the Antitrust Criminal Penalty Enhancement and Reform Act), a successful leniency applicant that provides satisfactory cooperation to civil plaintiffs is exposed to single, not treble, damages, and is relieved of joint-and-several liability for its co-conspirators' overcharges. That detrebling is often worth more than the criminal immunity.

The practical consequence is a race. The moment credible evidence of cartel conduct surfaces, the clock is running against every other participant's counsel making the same call. That is why the internal-investigation trigger matters so much: an antitrust red flag is not a "let's monitor it" event.

If the subpoena or the dawn raid comes first, work from Responding to a Government Subpoena or Investigation: A Practical Checklist and issue the hold immediately — see Issuing a Litigation Hold and Preserving ESI: A Practical Checklist. Document destruction after an antitrust inquiry is how a survivable civil case becomes an obstruction indictment.

Pillar 10 — Private litigation: treble damages, standing, and class actions

Clayton Act § 4 (15 U.S.C. § 15) gives "any person ... injured in his business or property" treble damages, costs, and a reasonable attorney's fee. Treble damages are mandatory, not discretionary. The statute of limitations is four years from accrual (15 U.S.C. § 15b), subject to fraudulent-concealment tolling — which cartel plaintiffs almost always plead, since cartels are by nature concealed — and to the continuing-violation rule, under which each sale at a conspiratorially fixed price starts a new limitations clock. A government antitrust suit also suspends the private limitations period and for one year after.

Four doctrines cabin who may sue:

Class actions. Antitrust damages cases are class actions in practice. Certification under Fed. R. Civ. P. 23(b)(3) turns almost entirely on predominance, and predominance turns almost entirely on whether the plaintiffs' economist can show antitrust impact — that essentially all class members paid an overcharge — with common evidence. Comcast Corp. v. Behrend, 569 U.S. 27 (2013), requires the damages model to measure only the damages attributable to the plaintiffs' theory of liability. The certification fight is therefore a Daubert fight, conducted through expert regression models.

Work the mechanics through Class Action Litigation: A Comprehensive Guide to Rule 23 and The Class Action Toolkit; the certification tactics through Moving for Class Certification: A Practical Checklist and Opposing Class Certification: A Defense Checklist; the expert war through Challenging an Expert Under Daubert and Rule 702: A Practical Checklist; the exit through Settling a Class Action: A Rule 23(e) Approval Checklist; and the number itself through The Litigation Damages Toolkit: Valuing and Proving Money Awards. For the procedural spine, The Federal Discovery Toolkit: A Roadmap From Rule 26(f) to Sanctions and The Civil Pretrial Toolkit: From Pleadings to Summary Judgment.

Thornwood. Eighteen months after the grand jury subpoena, Thornwood faces: a DOJ criminal case; a direct-purchaser class of municipal utilities under § 4; an indirect-purchaser class of downstream ratepayers under twenty-odd state repealer statutes; opt-out suits from the three largest utilities; and state AG parens patriae actions under 15 U.S.C. § 15c. The single overcharge is being trebled multiple times over. Thornwood's co-conspirator, who called DOJ first, is paying single damages and no criminal fine.

Pillar 11 — Compliance programs

Antitrust compliance is unusual in that a good program can literally be the difference between a corporate felony conviction and a declination. Since 2019, the Antitrust Division has credited effective compliance programs at the charging stage — a departure from decades of practice — and its guidance on Evaluation of Corporate Compliance Programs in Criminal Antitrust Investigations sets out what "effective" means. The questions the Division asks are the ones you should be asking yourself:

  • Is the program designed for the actual risks of this business — or is it a generic code of conduct? A company whose sales force meets competitors at four trade shows a year has a specific, identifiable risk.
  • Is it applied earnestly and in good faith, with real resources and senior ownership — or is it a poster?
  • Does it work in practice? Did it detect anything? Did anyone get disciplined?
  • Is there a functioning reporting channel, and does the company actually investigate what comes through it?
  • Does the company remediate — discipline wrongdoers, fix the process, and self-report?

The concrete controls that matter for antitrust specifically: a trade-association policy (agenda review, counsel present, minutes, walk-out protocol); a competitor-contact rule (log it, never discuss price/wages/customers/capacity, leave the room and say so audibly); document hygiene training for sales and deal teams; pre-clearance for any information exchange or benchmarking participation; HR training on no-poach; M&A deal-document discipline; and a real, tested escalation path so that a credible cartel signal reaches the general counsel in days, not quarters — because of the leniency race.

Build it from Antitrust Compliance: A Practical Checklist, situate it inside the enterprise program via The Corporate Compliance Toolkit, and give the board the oversight duty it owes under Corporate Governance and Fiduciary Duties: A Comprehensive Guide for Directors and Officers and Board Governance, Minutes, and Corporate Formalities: A Practical Checklist.

The landscape as a working checklist

Run this as a gated audit of a company, a transaction, or a course of conduct.

Gate 1 — Is there an agreement with a competitor?

  • [ ] Identify every touchpoint with competitors: trade associations, standards bodies, joint ventures, benchmarking surveys, shared distributors, hiring.
  • [ ] For each, ask whether price, output, capacity, wages, customers, or territories were discussed. If yes, stop and call counsel.
  • [ ] Confirm no naked price-fixing, bid-rigging, market-allocation, wage-fixing, or no-poach agreement exists — these are per se and criminal.

Gate 2 — Is competitively sensitive information moving?

  • [ ] Inventory every data flow to or from competitors, including through third-party administrators and pricing software.
  • [ ] Test each against the risk factors: concentration, currency, disaggregation, sensitivity, public availability.
  • [ ] Do not rely on the withdrawn agency "safety zones." Get a current written clearance.

Gate 3 — Are the vertical restraints defensible?

  • [ ] Map RPM, territories, customer restrictions, exclusive dealing, and tying/bundling.
  • [ ] Confirm federal rule-of-reason defensibility and state-law compliance (minimum RPM remains per se in some states).
  • [ ] If relying on Colgate, confirm the policy is genuinely unilateral — no negotiated assurances.

Gate 4 — Is the firm dominant, and is its conduct exclusionary?

  • [ ] Define the relevant market honestly, including aftermarkets.
  • [ ] Screen loyalty rebates, bundling, exclusives, and refusals to deal against Trinko/Aspen Skiing and Brooke Group.
  • [ ] Ensure every restrictive practice has a documented, contemporaneous procompetitive rationale.

Gate 5 — Is a transaction in play?

  • [ ] Determine HSR reportability against the current-year thresholds; determine filing fee tier.
  • [ ] Discipline deal-document vocabulary from the first diligence memo (Item 4(c)/4(d)).
  • [ ] Assess substantive § 7 risk under the current Merger Guidelines — including labor, serial-acquisition, and vertical theories.
  • [ ] Preserve independence until the waiting period expires. No gun-jumping.

Gate 6 — Is IP being used as a restraint?

  • [ ] Screen licenses and pools for downstream price or market coordination.
  • [ ] Screen patent settlements for large, unexplained reverse payments (Actavis).
  • [ ] Confirm FRAND commitments are honored and standard-setting disclosures are complete.

Gate 7 — Is the compliance program real?

  • [ ] Risk-tailored, board-sponsored, trained, tested, audited, and enforced.
  • [ ] Competitor-contact rule and trade-association protocol in force.
  • [ ] Escalation path fast enough to win the leniency race.

Gate 8 — If something has already happened.

  • [ ] Preserve immediately; issue the litigation hold; stop all document destruction.
  • [ ] Retain outside antitrust counsel; conduct a privileged internal investigation.
  • [ ] Evaluate leniency now — there is one slot, and the four-year private limitations clock is not the clock that matters.

Primary Authority

Statutes and rules

Cases

Agency materials (enforcement guidance, not law, entitled to no Chevron deference after Loper Bright; every one of these has been withdrawn, replaced, or rewritten at least once — confirm the current version and the current numbers before relying on any of them)

  • DOJ/FTC Merger Guidelines (2023)
  • DOJ Antitrust Division Leniency Policy and Procedures (revised 2022)
  • DOJ Antitrust Division, Evaluation of Corporate Compliance Programs in Criminal Antitrust Investigations
  • DOJ/FTC Antitrust Guidelines for the Licensing of Intellectual Property
  • DOJ/FTC Antitrust Guidance for Human Resource Professionals (2016)
  • FTC Policy Statement Regarding the Scope of Unfair Methods of Competition Under Section 5 of the FTC Act (2022)

Secondary Sources

  • Areeda & Hovenkamp, Antitrust Law — the field's controlling treatise; courts cite it constantly, and its market-definition and § 2 volumes are the best available guides to how judges actually reason.
  • Hovenkamp, Federal Antitrust Policy: The Law of Competition and Its Practice.
  • ABA Section of Antitrust Law, Antitrust Law Developments — the practitioner's survey of the case law by doctrine.
  • ABA Section of Antitrust Law, Premerger Notification Practice Manual — indispensable for HSR reportability questions.

Related UpLaw Resources

Related Guides & Articles

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Related Toolkits

This toolkit is general legal information from UpLaw (uplaw.us), not legal advice, and does not create an attorney-client relationship. Antitrust law, agency guidelines, HSR thresholds, and civil penalty amounts change frequently, and state antitrust law diverges from federal law on important points including resale price maintenance and indirect-purchaser standing; verify current requirements and consult qualified counsel before acting.