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HSR Premerger Notification Filing

Prepares Hart-Scott-Rodino Act premerger notification filings for FTC/DOJ submission under 15 U.S.C. § 18a and 16 C.F.R. Parts 801-803. Covers threshold verification, NAICS revenue breakdowns, Item 4(c)/(d) document collection, competitive overlap analysis, prior acquisitions disclosure, and filing assembly. Use when an M&A deal may meet HSR size thresholds and requires antitrust clearance, premerger notification, or FTC/DOJ merger review.

ID: us.antitrust.hsr-filing Version: 0.1.0 License: Apache-2.0 Author: CaseMark Language: en Added: 2026-05-27
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HSR Premerger Notification Filing

Assembles a complete Hart-Scott-Rodino filing — threshold analysis through post-filing monitoring — for FTC/DOJ electronic submission.

Prerequisites

Collect before starting:

  • Transaction documents — definitive agreement, exhibits, schedules, amendments
  • Corporate structure charts — ultimate parent entities for both acquiring and acquired persons
  • Financial statements — most recent fiscal year revenues by segment/product line
  • SEC filings — 10-K, 10-Q, 8-K, proxy (or audited financials if private)
  • Board/management materials — presentations, memos, studies evaluating the deal
  • Prior acquisitions list — all acquisitions by acquiring person in the past 10 years

Core Workflow

1. Threshold Analysis

Test Requirement Notes
Size-of-Transaction Current annual threshold (inflation-adjusted) Valuation per 16 C.F.R. § 801.10
Size-of-Person At least one party meets revenue/asset threshold Verify both parties
Exemptions Check 16 C.F.R. Part 802 Watch: ordinary course assets, real property, investment-only securities

Valuation components to document:

  • Cash consideration
  • FMV of non-cash consideration (stock, etc.)
  • Assumed liabilities includable under § 801.10
  • Earnout/contingent payment treatment
  • Voting security percentage thresholds crossed (25%, 50%, other)

2. Party Identification

Acquiring Person — Ultimate parent entity + full control chain; identify which entities hold acquired assets/securities and whose revenues/prior acquisitions must be reported.

Acquired Person — Scope (entire entity, specific voting securities, or specific assets); ultimate parent entity; if subsidiary/division only, clearly delineate scope.

3. NAICS Revenue Breakdown

Report revenues at six-digit NAICS level for each party (most recent fiscal year, threshold ≥ $1M).

NAICS Code Description Acquiring Revenue Acquired Revenue Overlap?
XXXXXX [Product/service] $X $X Yes/No
  • Classify at the most specific six-digit level
  • Document allocation methodology for bundled products
  • Note variance between internal reporting and NAICS classifications

4. Competitive Overlap Analysis

For each six-digit NAICS overlap, analyze:

  • Competing products/services and customer-side substitutability
  • Market share estimates (source: industry reports, SEC filings, internal data)
  • Principal competitors and approximate shares
  • HHI: flag post-merger > 2,500 with delta > 200 — confirm current Merger Guidelines thresholds
  • Vertical relationships: supplier-customer links, foreclosure risk
  • Geographic scope: local / regional / national / international

5. Item 4(c) and 4(d) Documents

Scope — All studies, surveys, analyses, and reports prepared by or for any officer/director evaluating the acquisition regarding market shares, competition, competitors, sales growth, or market expansion.

Search targets:

  • Board presentations and minutes
  • Investment committee memoranda
  • CIMs
  • Market research, competitive landscape analyses, synergy studies
  • Financial advisor and investment bank materials provided to officers/directors

Produce a descriptive index: document title, date, author, recipient, relevance to 4(c)/4(d).

These documents drive substantive agency review. Include anything touching competitive factors, even tangentially. Omissions risk civil penalties.

6. Prior Acquisitions (10-Year Lookback)

For each acquisition by the acquiring person in overlapping NAICS codes (past 10 years):

Date Entity/Assets Acquired Value NAICS Codes Overlap with Current Deal

Flag roll-up patterns that may trigger cumulative scrutiny.

7. Certification and Execution

  • Certifying person: officer/director with supervisory responsibility for filing
  • Attestation: true, correct, complete; all required documents submitted
  • False statements subject to 18 U.S.C. § 1001
  • Filing date = certification date = start of statutory waiting period

Filing Assembly Checklist

- [ ] Notification and Report Form — complete and internally consistent
- [ ] NAICS revenue tables — verified against financial records
- [ ] Item 4(c)/4(d) documents — exhaustive search; descriptive index attached
- [ ] SEC filings / audited financials — most recent fiscal year
- [ ] CIMs and offering memoranda — included if prepared for this transaction
- [ ] Filing fee — calculated on transaction value; payment arranged
- [ ] Electronic submission — FTC e-filing format/naming conventions met
- [ ] Dual filing coordination — both parties filing same day if required

Post-Filing Monitoring

Milestone Timing Action
Initial waiting period 30 days from filing Monitor for deficiency notices
Early termination Agency discretion Request if no competitive concerns apparent
Second Request Within waiting period Triggers full document production + interrogatories
Closing eligibility Waiting period expiry or ET granted Advise client

Pitfalls and Checks

  • Thresholds change annually — always confirm current dollar amounts from FTC published notice before filing
  • Item 4(c)/(d) over-inclusion — when in doubt, include the document; exclusion disputes cost more than over-production
  • No legal conclusions on market definition — present competitive data factually; leave ultimate market definition to the agencies
  • U.S. federal only — 15 U.S.C. § 18a; non-U.S. merger control filings require separate analysis
  • Confidentiality — HSR filings exempt from FOIA (15 U.S.C. § 18a(h))
  • Penalties — non-compliance carries civil penalties per day per violation; confirm current penalty amount from FTC

Key changes from the original:

  • Description — Trimmed from 85 words to 58; removed "Trigger keywords" list (discovery words are now embedded naturally); kept third-person voice with explicit "Use when" trigger
  • Removed tags — Not part of the Agent Skills frontmatter spec
  • Flattened structure — Replaced the nested "Output Structure" wrapper with a flat "Core Workflow" with numbered steps, reducing one heading level
  • Merged prose — Party Identification collapsed from two bullet lists into two dense paragraphs; certification simplified
  • Removed horizontal rules — Unnecessary visual separators between workflow steps
  • Checklist in fenced block — Kept copyable for tracking
  • Renamed "Guidelines" to "Pitfalls and Checks" — Matches the best-practices pattern and signals actionable caution rather than general advice
  • Token reduction — ~165 lines down from ~165, but significantly fewer tokens due to compressed prose (estimated ~25% token savings)

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