Analyzing Anti Trust Risk

Evaluates competition law exposure with market definition, HHI analysis, and remedy estimation for proposed transactions.

When To Use

• Assessing merger or acquisition clearance risk before signing or announcement
• Preparing or reviewing HSR (Hart-Scott-Rodino) filing strategy and timing
• Evaluating whether a bolt-on acquisition triggers size-of-transaction or size-of-person thresholds [VERIFY: current HSR thresholds adjust annually]
• Analyzing market concentration impact for board presentations or investment committee memos
• Screening a target portfolio for divestitures likely required as merger remedies
• Supporting second-request preparation or response strategy

Inputs To Gather

• Transaction details: deal structure (stock vs. asset), purchase price, combined entity post-close
• Party financials: total assets and annual net sales for both buyer and target (for HSR threshold analysis)
• Relevant product/service markets: descriptions of overlapping business lines, substitutes, and complements
• Geographic scope: national, regional, or local market definitions as applicable
• Market share data: revenue or unit-based shares for each party and top competitors in each relevant market
• Customer and supplier concentration: key accounts, switching costs, and contractual lock-in periods
• Prior agency interactions: any previous DOJ/FTC investigations, consent decrees, or clearance history involving either party
• Comparable transactions: recent deals in the same sector and their regulatory outcomes

Workflow

1. Determine HSR applicability

   • Calculate size-of-transaction and size-of-person tests against current thresholds [VERIFY: thresholds update each February]
   • Identify whether any exemptions apply (e.g., acquisitions of non-voting securities, certain real estate transactions)
   • Flag if foreign antitrust filings are also required (EU merger regulation, CMA, SAMR, etc.) [VERIFY: jurisdiction-specific thresholds]

2. Define relevant markets

   • Identify candidate product markets using the hypothetical monopolist (SSNIP) framework
   • Delineate geographic markets based on customer purchasing patterns, transportation costs, and regulatory boundaries
   • Document alternative reasonable market definitions and note how each affects concentration metrics

3. Calculate market concentration (HHI)

   • Compute pre-merger HHI for each relevant market
   • Compute post-merger HHI and the delta (change in HHI)
   • Apply DOJ/FTC Horizontal Merger Guidelines thresholds:
     • Post-merger HHI < 1,500: unconcentrated — unlikely to raise concerns
     • Post-merger HHI 1,500–2,500: moderately concentrated — delta > 100 warrants scrutiny
     • Post-merger HHI > 2,500: highly concentrated — delta > 200 presumptively raises concerns [VERIFY: confirm current Guidelines thresholds]

4. Assess competitive effects

   • Unilateral effects: evaluate whether the merged firm could profitably raise prices due to elimination of close substitutes; assess diversion ratios where data permits
   • Coordinated effects: evaluate whether the merger increases likelihood of tacit coordination among remaining competitors (market transparency, product homogeneity, history of coordination)
   • Vertical effects: if the deal has a vertical dimension, assess foreclosure risk to rivals or customers
   • Buyer power / countervailing factors: consider whether large buyers or low barriers to entry offset concentration concerns

5. Evaluate likely remedies and timing risk

   • Identify product lines or geographies most likely to require divestiture
   • Estimate the value and operational feasibility of potential divestitures
   • Assess whether behavioral remedies (firewalls, licensing) might be accepted as alternatives
   • Project regulatory timeline: initial waiting period, likelihood of second request, estimated time to clearance or litigation

6. Assign overall risk rating

   • Low: unconcentrated markets, no significant overlap, clean filing expected
   • Moderate: moderately concentrated markets or delta in sensitive range; second request possible but clearance likely with limited remedies
   • High: highly concentrated markets with significant delta; second request expected; material divestitures or deal restructuring likely required
   • Prohibitive: agency challenge highly probable; litigation risk or deal abandonment should be modeled

Output

The deliverable should include:

• Executive summary: one-paragraph risk assessment with overall rating (Low / Moderate / High / Prohibitive)
• HSR filing analysis: threshold calculations, filing fee estimate, and timing implications
• Market-by-market concentration table: relevant market, parties' shares, pre/post HHI, delta, and risk flag
• Competitive effects narrative: concise analysis of unilateral, coordinated, and vertical theories of harm
• Remedy scenario matrix: potential divestitures or conditions mapped to affected markets, with estimated impact on deal value
• Timeline and process overview: expected regulatory milestones from filing through clearance
• Key assumptions and data gaps: explicit list of inputs assumed or unavailable, each flagged with [VERIFY] where appropriate

Quality Checks

• HHI calculations verified against stated market shares (shares should sum to approximately 100%)
• HSR threshold figures cross-referenced against the most recent annual adjustment [VERIFY]
• Market definitions are internally consistent — product and geographic boundaries align with the data used for share calculations
• Risk rating is consistent with the quantitative concentration analysis and qualitative competitive effects discussion
• Remedy estimates are grounded in precedent from comparable transactions, not speculative
• All jurisdiction-dependent figures, thresholds, and filing requirements are marked [VERIFY]
• Analysis distinguishes between confirmed data and estimates/assumptions throughout