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Antitrust attorney on retainer: merger and acquisition antitrust advisory, antitrust compliance program advisory, and government investigation defense on monthly retainer

August 6, 2026 · ~22 min read

A mid-market software company signs a letter of intent to acquire a smaller competitor in the enterprise cloud infrastructure management space for $295 million. The transaction is announced on a Monday. The deal team’s investment banker advises that the transaction exceeds the Hart-Scott-Rodino filing threshold and that the parties will need to notify the Department of Justice and Federal Trade Commission before closing. The acquiring company’s general counsel asks the external antitrust attorney to file the HSR notification and manage the review process through clearance. The antitrust attorney files the notification six weeks after signing, the 30-day initial waiting period begins running, and the DOJ issues a Second Request for additional documents on day 28 of the waiting period. The deal team’s investment banker tells the CEO that Second Requests typically take six to eighteen months to resolve and cost $3 million to $15 million in legal and document production fees. The CEO asks why the company’s antitrust attorney did not warn them about the Second Request risk during the pre-signing due diligence phase.

The answer requires explaining that the company did not have an ongoing antitrust retainer that included pre-signing competitive overlap analysis, and the antitrust attorney was not engaged until after the letter of intent was signed. The company’s HSR counsel, engaged only to file the notification form, reviewed the transaction’s size-of-transaction and size-of-person thresholds and prepared the HSR notification without conducting a substantive competitive overlap analysis of the two companies’ enterprise cloud cost management software products, their overlapping customer lists, and the pricing documents that would be produced in the Second Request and reveal the competitive significance the acquiring company placed on eliminating the target as a competitor. Had the antitrust attorney been engaged before signing and conducted a pre-signing antitrust risk assessment, the deal team would have identified the Second Request risk, structured the transaction to include a reverse termination fee that allocated the Second Request cost risk, and prepared the 4(c) and 4(d) document list before filing to avoid producing internal documents that gave the DOJ staff attorneys their primary theory of competitive harm.

Antitrust attorneys on monthly retainer — J.D.s specializing in competition law under the Sherman Antitrust Act, the Clayton Act, and the Federal Trade Commission Act — do a substantial share of their highest-value work between the visible milestones of HSR filings, Second Requests, and government investigation subpoenas. This guide covers merger and acquisition antitrust advisory, antitrust compliance program advisory, and government investigation defense: the legal frameworks behind each service area, the specific antitrust standards that govern the advisory, and how to structure a retainer agreement that makes the ongoing antitrust advisory work visible between merger review and enforcement milestones.

Merger and acquisition antitrust advisory

Merger and acquisition antitrust advisory is the retainer function that evaluates proposed transactions for antitrust risk before signing, advises on HSR notification threshold analysis and filing strategy, manages the merger review process through clearance, and advises on transaction structure modifications that reduce antitrust risk during pre-signing due diligence and after-signing clearance proceedings.

HSR notification threshold analysis and filing strategy

The Hart-Scott-Rodino Antitrust Improvements Act of 1976, 15 U.S.C. §18a, requires parties to certain mergers and acquisitions to notify the DOJ Antitrust Division and the FTC Bureau of Competition before closing and to observe a mandatory waiting period. HSR notification is required when both the size-of-transaction test and the size-of-person test are satisfied. The size-of-transaction test under 16 CFR §801.10 is satisfied when the aggregate total consideration for the acquisition (including cash, securities, assumed liabilities, and contingent consideration) exceeds the indexed HSR filing threshold, which is adjusted annually; as of 2025, the basic filing threshold is $119.5 million. The size-of-person test under 16 CFR §801.11 is satisfied when one party to the transaction has annual net sales or total assets of $239.2 million or more and the other party has annual net sales or total assets of $23.9 million or more.

HSR exemptions analysis is the threshold advisory task that evaluates whether a transaction that meets the size-of-transaction and size-of-person tests qualifies for one of the exemptions that eliminates the filing obligation. Key exemptions under 16 CFR Part 802 include the acquisition of goods or realty in the ordinary course of business, acquisitions of 10% or less of the voting securities of a U.S. issuer made solely for investment purposes, acquisitions by foreign acquirers of foreign issuers where the U.S. nexus falls below specified thresholds, and intraperson acquisitions. The retained antitrust attorney analyzing a transaction for HSR filing obligations evaluates each potentially applicable exemption, advises on the risk of a mistaken conclusion that an exemption applies (which could expose the parties to civil penalties of up to $51,744 per day for failure to file), and recommends a voluntary filing for transactions that are close to the threshold or raise significant competitive concerns even if the filing thresholds are not technically met.

Pre-signing antitrust risk assessment is the highest-value advisory function in merger and acquisition antitrust work and the function most commonly excluded from transactional retainer engagements that engage antitrust counsel only to file the HSR notification. The pre-signing antitrust risk assessment evaluates the competitive overlap between the acquirer’s and target’s products or services in each relevant market, the parties’ combined market shares in those markets under the DOJ and FTC 2023 Merger Guidelines’ Herfindahl-Hirschman Index (HHI) threshold framework, the competitive significance of the target to the acquirer as reflected in the acquirer’s internal documents, the availability of merger remedies (behavioral commitments or divestitures) that could resolve competitive concerns, and the probability and estimated cost of a Second Request investigation. The pre-signing assessment gives the deal team the information needed to decide whether to proceed with the transaction as structured, to modify the transaction structure to reduce antitrust risk, to negotiate a reverse termination fee that allocates the regulatory risk to the seller, or to abandon the transaction before signing.

Market definition and competitive overlap analysis

Market definition is the analytical foundation of merger antitrust review and the framework through which the DOJ Antitrust Division and FTC Bureau of Competition evaluate whether a proposed transaction substantially lessens competition. The relevant market comprises a product market and a geographic market. The DOJ and FTC 2023 Merger Guidelines define the relevant product market using the hypothetical monopolist test (also known as the SSNIP test): the relevant market is the smallest set of products and geographies within which a hypothetical profit-maximizing monopolist could sustain a small but significant and non-transitory increase in price (typically 5% to 10% above prevailing levels) without losing enough sales to make the price increase unprofitable. The test identifies the market by assessing whether customers could substitute to other products or geographic sources if prices increased by the specified amount.

Horizontal merger analysis under the 2023 Merger Guidelines evaluates whether the transaction would substantially lessen competition in relevant markets where both the acquirer and the target compete. The primary analytical tool is the HHI measure of market concentration: the HHI is calculated by summing the squares of each firm’s market share percentage. Mergers producing a post-merger HHI above 1,800 and an HHI increase above 100 points are presumed likely to enhance market power under the 2023 Guidelines’ revised thresholds (the 2010 Merger Guidelines used thresholds of 2,500 and 200). The retained antitrust attorney conducting a horizontal merger analysis calculates the parties’ combined market shares across each relevant product market and geographic market, estimates the post-merger HHI and HHI increase, evaluates whether entry by new competitors would be timely, likely, and sufficient to offset competitive harm, and assesses whether the efficiencies generated by the transaction (cost savings, innovation, improved quality) are cognizable under the Merger Guidelines and would counteract the potential competitive harm.

Vertical merger analysis evaluates whether a transaction between firms operating at different levels of the supply chain (an upstream supplier and a downstream customer, for example) would harm competition by enabling the combined firm to foreclose rivals from access to essential inputs or customers, raise rivals’ costs, or facilitate coordination among remaining competitors. The 2023 Merger Guidelines addressed vertical mergers by evaluating whether the merged firm has the ability and incentive to foreclose rivals from the input or distribution channel, whether foreclosure would substantially lessen competition, and whether efficiencies would offset the competitive harm. The retained antitrust attorney analyzing a vertical acquisition advises on the foreclosure risk, the credibility of the efficiency justification, and the structural remedies that could resolve a vertical competitive concern.

Second Request response coordination and merger clearance strategy

A Second Request is a formal demand for additional documents and information issued by the DOJ Antitrust Division or the FTC Bureau of Competition during the HSR initial waiting period when the reviewing agency concludes that the transaction requires further investigation. The Second Request extends the initial 30-day waiting period (15 days for cash tender offers and bankruptcy acquisitions) until the parties certify substantial compliance with the Second Request’s document and information demands, at which point a new 30-day waiting period (10 days for cash tender offers) begins running. Second Requests are a significant intervention in the merger process: compliance typically requires producing hundreds of thousands to millions of documents from dozens of custodians, responding to extensive written interrogatories covering market definition, competitive dynamics, and transaction rationale, and making witnesses available for depositions.

Second Request scope negotiation is the retained antitrust attorney’s first priority after a Second Request is issued. The DOJ and FTC have authority under 15 U.S.C. §18a(e) to demand any information relevant to determining whether the transaction violates the Clayton Act, and Second Requests are intentionally broad, requiring production of all documents relating to competition, pricing, customers, and market analysis. The retained attorney negotiates with agency staff attorneys to narrow the Second Request by defining custodians whose documents are most responsive, agreeing on a document production protocol (search terms, date ranges, privilege review procedures), and obtaining a clarification letter that limits the scope of the interrogatories. Negotiating a reasonable Second Request compliance scope can reduce document review and production costs by 30% to 60% and shorten the compliance timeline by two to four months.

Merger clearance strategy during agency review requires the retained attorney to manage the timing and content of agency communications, coordinate proffers (informal presentations to agency staff attorneys summarizing the transaction’s competitive rationale, market definition, and efficiencies), prepare witnesses for investigational hearings, and evaluate the advisability of proposing remedies (behavioral commitments or divestitures) versus defending the transaction through the full investigation timeline. The clearance strategy decision — litigate to block through administrative adjudication or federal court, accept behavioral commitments, or offer a structural divestiture to resolve competitive concerns — requires evaluating the strength of the agency’s competitive harm theory, the availability of a clean remedy that resolves the agency’s concerns without destroying the transaction’s commercial rationale, and the timeline and cost risk of litigating a preliminary injunction proceeding against a federal agency.

Antitrust compliance program advisory

Antitrust compliance program advisory is the retainer function that develops and maintains the client’s internal antitrust compliance infrastructure: training programs for sales, procurement, and executive teams on per se violation risk and information exchange restrictions, protocols for identifying and reporting potential Sherman Act violations, and internal investigation procedures for responding to discovered compliance issues before they become government investigations.

Sherman Act Section 1 per se violations: detection and avoidance

Sherman Act Section 1, 15 U.S.C. §1, prohibits every contract, combination, or conspiracy in restraint of trade. Certain categories of horizontal restraints among competitors are per se unlawful under Section 1 — illegal without any balancing of competitive effects or market power — because their anticompetitive effects are so clear and their potential for competitive benefit so limited that courts have determined they are never justified. The three categories of per se Section 1 violations most relevant to corporate antitrust compliance programs are horizontal price fixing, market allocation agreements, and bid rigging.

Horizontal price fixing includes any agreement among competing companies to fix, raise, stabilize, or otherwise coordinate the prices charged to customers. Price fixing agreements may be explicit (a direct agreement on price levels or price increases) or implicit (a mutual understanding to follow a price leader’s announced increases). The retained antitrust attorney advising on price fixing risk analyzes whether the client’s pricing practices involve any coordination with competitors, whether pricing information exchanged at trade association meetings or industry conferences creates inference risk, and whether the client’s sales team’s practices of announcing price increases in advance of implementation could be characterized as a facilitating practice under the antitrust doctrine on price signaling.

Market allocation agreements divide customers, geographic territories, or product markets among competing companies, with each competitor agreeing not to compete for the customers or in the territories allocated to others. Market allocation agreements are per se unlawful regardless of whether the allocating parties have market power or whether the agreement produces any efficiency benefit. The retained antitrust attorney advising on market allocation risk evaluates whether the client’s distribution arrangements, exclusive territory provisions in agreements with distributors or dealers, or informal understandings among competitors about not soliciting each other’s customers constitute illegal market allocation under Section 1.

Bid rigging occurs when competitors conspire to manipulate the outcome of a competitive bidding process by coordinating which competitor will submit the winning bid, the prices to be submitted by each bidder, or which competitors will refrain from bidding. Bid rigging is per se unlawful under Section 1 and is also a criminal violation prosecuted by the DOJ Antitrust Division under the Sherman Act’s criminal penalties (15 U.S.C. §1 provides penalties of up to $100 million for corporate defendants and up to $1 million and 10 years imprisonment for individuals). The retained antitrust attorney advising on bid rigging risk evaluates whether the client’s procurement practices involve any coordination with competing bidders in the same supplier category, whether the client’s submission of subcontractor bids to prime contractors in competitive bid solicitations creates subcontracting bid rigging risk, and whether the client’s participation in industry consortia or joint procurement arrangements creates bid coordination exposure.

Information exchange restrictions for trade association participation

Trade association participation creates antitrust risk when the association’s activities facilitate the exchange of competitively sensitive information among competing members. The antitrust standard governing information exchanges among competitors is a rule of reason analysis under Section 1: the competitive harm of the information exchange is weighed against its pro-competitive benefits. Information exchanges are more likely to be found anticompetitive when the exchanged information is current (rather than historical), disaggregated (identifying individual firm data rather than industry-level aggregates), comprehensive (covering all or most market participants), and competitively sensitive (covering pricing, costs, output, customers, or capacity).

The retained antitrust attorney advising on trade association participation develops protocols that allow the client’s employees to participate in legitimate industry association activities — discussing industry-wide regulatory issues, coordinating on safety and technical standards, sharing aggregated historical market data — while avoiding communications that could constitute per se Section 1 violations or facilitate coordinated effects through information sharing. The protocols specifically address the risk of informal competitor contacts at trade association meetings where price, capacity, or customer discussions may occur outside the formal meeting agenda, the risk of industry surveys that collect and distribute disaggregated current pricing or cost data among member companies, and the risk of association working groups that discuss future pricing trends or market supply-demand balance projections.

Sherman Act Section 2 unilateral conduct: monopolization and attempted monopolization

Sherman Act Section 2, 15 U.S.C. §2, prohibits monopolization, attempted monopolization, and conspiracy to monopolize. Unlike Section 1’s per se prohibition on horizontal restraints, Section 2 unilateral conduct claims are evaluated under a rule of reason framework that requires the plaintiff to prove (1) possession of monopoly power in a relevant market, (2) willful acquisition or maintenance of that power through exclusionary conduct, and (3) that the challenged conduct is causally connected to the acquisition or maintenance of monopoly power. The retained antitrust attorney advising on Section 2 risk evaluates whether the client has market power in any relevant product or geographic market, whether the client’s unilateral business practices could be characterized as exclusionary conduct under Section 2’s evolving case law, and whether the client’s pricing practices create predatory pricing, exclusive dealing, or tying liability.

Predatory pricing advisory evaluates whether the client’s pricing practices could be characterized as below-cost pricing designed to drive out competition, creating potential Section 2 liability under the standard established in Brooke Group Ltd. v. Brown & Williamson Tobacco Corp., 509 U.S. 209 (1993): prices below an appropriate measure of cost (typically average variable cost) and a dangerous probability of recouping the investment in below-cost pricing through monopoly profits after competition is eliminated. The retained attorney evaluating predatory pricing risk analyzes the client’s cost structure, the relationship between the client’s prices and its variable and fully allocated costs, and whether the client’s pricing decisions are documented as legitimate competitive responses rather than predatory campaigns.

Exclusive dealing and tying advisory evaluates whether the client’s distribution and supply agreements foreclose competitors from a sufficient share of the relevant market to constitute exclusionary conduct under Section 2. Exclusive dealing arrangements — requiring distributors or customers to purchase exclusively from the client or not to purchase from the client’s competitors — are evaluated under a rule of reason analysis that examines the foreclosure share, the anticompetitive effect on rivals’ ability to achieve minimum efficient scale, the duration and breadth of the exclusivity provision, and the legitimate business justification for the exclusivity arrangement. Tying arrangements — conditioning the sale of one product (the tying product) on the buyer’s purchase of a separate product (the tied product) — raise per se Section 1 concerns when the tying product seller has market power in the tying product market, a substantial volume of commerce in the tied product market is foreclosed by the arrangement, and there is no legitimate business justification for the tie.

Government investigation defense advisory

Government investigation defense advisory is the retainer function that responds to DOJ Antitrust Division and FTC Bureau of Competition investigations through Civil Investigative Demands, administrative subpoenas, and grand jury subpoenas in criminal cartel investigations: developing document preservation and litigation hold procedures, coordinating document production and privilege review, preparing witnesses for investigational hearings and grand jury testimony, evaluating leniency program applications, and advising on cooperation strategies with government investigators.

Civil Investigative Demand response strategy

A Civil Investigative Demand (CID) is a formal pre-litigation discovery tool used by the DOJ Antitrust Division under 15 U.S.C. §1312 and by the FTC under 15 U.S.C. §57b-1 to compel the production of documents, written interrogatory responses, and oral testimony from companies under investigation for antitrust violations. CIDs are issued before the government has filed a complaint and before any litigation has commenced; the recipient has no right to notice of the investigation’s scope or the basis for the government’s antitrust theory before receiving the CID. The retained antitrust attorney responding to a CID evaluates the CID’s scope, the government’s likely antitrust theory based on the CID’s document requests and interrogatories, the availability of legal challenges to the CID’s scope or constitutionality, and the strategy for engaging with government staff attorneys to negotiate a reasonable production timeline and scope.

Document preservation and litigation hold is the immediate response required upon receipt of a CID, before any substantive review of the CID’s demands begins. The retained attorney issues a litigation hold notice to all employees and third parties who may possess documents responsive to the CID, instructing them to preserve all potentially responsive documents and to suspend any routine document destruction policies that would otherwise delete relevant materials. The litigation hold notice must identify the scope of the potentially relevant subject matter, the categories of documents to be preserved (email, text messages, instant messages, voicemails, physical documents, and electronically stored information on all platforms), the custodians subject to the hold, and the retention obligations. Failure to preserve documents after receipt of a CID can result in spoliation sanctions in subsequent litigation and exposure to obstruction of justice charges in criminal cartel investigations.

Privilege review and production protocol development is the advisory function that establishes the framework for reviewing documents for attorney-client privilege and work product protection before production to the government. CID document productions in antitrust investigations typically involve large volumes of business documents, email communications among sales and executive teams, and financial data. The retained attorney oversees the privilege review process, develops a privilege log format that satisfies the government’s expectations while adequately protecting privileged communications, evaluates the scope of the crime-fraud exception to attorney-client privilege in criminal cartel investigations, and advises on the strategic implications of producing privileged documents under a compelled production that may limit subsequent privilege challenges.

Criminal cartel investigation defense and DOJ Leniency Program

The DOJ Antitrust Division’s Corporate Leniency Program, implemented through the Division’s Leniency Policy for amnesty from criminal prosecution, provides the first company to report cartel activity and cooperate with the government’s investigation with complete immunity from criminal prosecution for both the corporation and its cooperating employees. Leniency is available only if the applicant is the first to report the conduct to the DOJ Antitrust Division, the applicant did not coerce others to participate in the cartel, the applicant provides full, continuing, and complete cooperation with the Division’s investigation, and the applicant makes restitution to the victims of the illegal conduct. The retained antitrust attorney advising a company that has discovered potential criminal cartel activity within its organization evaluates whether leniency is available (based on whether the conduct is within an active DOJ investigation, whether a competitor has already applied for leniency in the same investigation, and whether the conduct meets the leniency program’s requirements), advises on the decision to self-report versus defend against a potential future government investigation, and coordinates the leniency application process with the DOJ Antitrust Division if self-reporting is recommended.

Grand jury subpoena response in criminal cartel investigations differs fundamentally from civil CID response: grand jury subpoenas are issued by a federal grand jury under the government’s criminal investigation authority, documents produced to the grand jury are protected from disclosure to civil plaintiffs by Federal Rule of Criminal Procedure 6(e), and individuals subpoenaed to testify before the grand jury may assert Fifth Amendment rights against self-incrimination. The retained antitrust attorney defending a company in a grand jury investigation evaluates each employee’s potential criminal exposure, advises on the availability of Fifth Amendment rights for individual witnesses, coordinates with individual employees’ separately retained criminal defense counsel, evaluates whether a corporate representation agreement with DOJ is appropriate to coordinate the corporation’s cooperation strategy, and advises on the risk that cooperation by the corporation may generate evidence against individual employees who face separate criminal exposure.

Structuring an antitrust attorney retainer for visibility

Antitrust attorney retainer work is inherently deadline-intensive and event-driven: HSR initial waiting periods run 30 days from filing with automatic extension on Second Request, CID response deadlines are typically 30 to 45 days from service with the right to petition for modification, grand jury subpoena return dates may be as short as 10 days, merger clearance strategy decisions must be made in the context of transaction-specific outside date provisions that typically give the parties 12 to 18 months before the acquisition agreement can be terminated without penalty. Each of these advisory milestones is preceded by weeks or months of preparatory advisory work — the competitive overlap analysis completed two months before the HSR filing, the document preservation protocol established the day after the CID arrives, the leniency program evaluation completed in 72 hours after discovering potential cartel conduct — that is invisible to the client’s M&A, legal, and compliance teams unless it is captured in a work log entry that connects the advisory task to the specific transaction or matter, the legal standard applied, and the strategic recommendation.

The most effective antitrust attorney retainer structures pair a defined monthly advisory scope (which pending transactions include pre-signing antitrust risk assessment, whether ongoing compliance program maintenance is included in the monthly fee, whether government investigation defense is billed at a separate matter-specific rate) with a shared work log that gives the client’s M&A, legal, and compliance teams a running record of the antitrust advisory activity between HSR filings, clearance decisions, and investigation milestones. The work log serves as both the primary deliverable for the ongoing compliance and M&A advisory function and as the supporting documentation for the more visible discrete deliverables — the HSR notification, the antitrust risk assessment memo, the compliance training program, the CID response letter — that the retained antitrust attorney produces when transaction or investigation milestones require action.

Antitrust attorneys on retainer who maintain detailed, matter-specific work logs — capturing the specific HSR threshold analysis, competitive overlap methodology, compliance training assessments, and CID response strategy evaluations for each advisory task — give their corporate clients an antitrust advisory record that demonstrates the ongoing nature of the compliance and transaction advisory relationship and the specific legal standards maintained between transaction closings and investigation responses. HourTab gives antitrust counsel a shareable, public-facing retainer dashboard where clients can see the current month’s advisory hours, the running work log with transaction-specific and compliance program entries, and the retainer progress bar — all without a client login or a separate portal. The retainer’s value is visible in the work log, not just in the HSR filings and clearance decisions that the ongoing antitrust advisory is designed to achieve.

Frequently asked questions

What does an antitrust attorney on retainer typically do?

An antitrust attorney on monthly retainer provides ongoing advisory across merger and acquisition antitrust advisory (HSR notification threshold analysis, pre-signing competitive overlap assessment, merger clearance strategy, Second Request response coordination), antitrust compliance program advisory (Sherman Act Section 1 per se violation detection and avoidance, trade association information exchange protocols, Section 2 unilateral conduct risk assessment), and government investigation defense (DOJ and FTC Civil Investigative Demand response, document preservation and litigation hold implementation, grand jury subpoena defense, and DOJ Leniency Program evaluation in criminal cartel investigations). See the FAQ section above for a detailed breakdown of each service area.

What antitrust advisory work is most commonly underlogged?

The most systematically underlogged categories are pre-signing antitrust risk assessment advisory (competitive overlap analysis, 2023 Merger Guidelines HHI threshold analysis, and Second Request risk evaluation before the LOI is signed), HSR notification threshold and exemption analysis for transactions close to the filing thresholds, antitrust compliance program development and employee training advisory (developing per se violation detection protocols and trade association information exchange restrictions), and Civil Investigative Demand response strategy advisory before document production begins (scope negotiation, document preservation, privilege review protocol development) — each of which produces no visible deliverable to the client’s business team unless captured in a detailed work log entry with the specific transaction or matter, legal framework applied, and strategic recommendation.

What should an antitrust attorney retainer agreement include?

Antitrust attorney retainer agreements should specify the services covered (M&A antitrust advisory, compliance program maintenance, government investigation defense, or a defined combination), the applicable legal frameworks (Sherman Antitrust Act 15 U.S.C. §§1-7; Clayton Act 15 U.S.C. §§12-27; FTC Act 15 U.S.C. §§41-58; HSR Act 15 U.S.C. §18a and 16 CFR Parts 801-803; 2023 Merger Guidelines; DOJ Corporate Leniency Policy), the deliverables format (antitrust risk assessment memos, HSR notification analysis, compliance training materials, CID response strategy memos), and the work log format. Monthly retainer amounts typically range from $5,000 to $25,000 per month for standard compliance and M&A advisory, increasing substantially during active Second Request proceedings or government investigations.

What are typical retainer rates for antitrust attorneys?

Antitrust associates and counsel with 3 to 7 years of experience in merger review and compliance program development typically bill at $350 to $550 per hour. Senior antitrust partners with merger clearance, government investigation defense, and criminal cartel defense experience typically bill at $500 to $900 per hour. Former DOJ Antitrust Division and FTC Bureau of Competition attorneys command premium rates at the top of these ranges. Monthly retainer amounts for standard antitrust advisory range from $5,000 to $25,000 per month; Second Request proceedings and criminal antitrust investigations are typically structured as separate matter-specific engagements with fees that can reach $100,000 to $500,000 per month or more during peak compliance and investigation phases.

How should antitrust attorney retainer hours be logged?

Antitrust attorney retainer work log entries should capture the transaction or matter name, the specific antitrust advisory task, the legal standard or analytical framework applied (HSR threshold calculation methodology, 2023 Merger Guidelines HHI analysis, Sherman Act Section 1 per se category evaluated, CID scope negotiation approach), and the finding or strategic recommendation. Entries that identify the specific competitive overlap markets analyzed, the HSR exemption conclusions, the compliance risk categories addressed in training sessions, and the CID response strategy decisions transform the antitrust retainer into a documented antitrust advisory record between transaction filings and government investigation responses.