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When companies amend their SEC filings, the changes can be buried in hundreds of pages of identical text. SEC API’s diff engine compares any two versions of a filing and returns a structured changeset — additions, deletions, and modifications — so you can see exactly what changed without reading the entire document.

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Capabilities

Structured diffs

Additions, deletions, and modifications returned as structured JSON with section-level context.

Amendment comparison

Compare an original 10-K with its 10-K/A amendment automatically. Works with any form type that has amendments.

Section-level granularity

Changes grouped by section (e.g., Item 1A Risk Factors, Item 8 Financial Statements) for quick navigation.

Numeric change detection

Financial figures that changed are flagged with old and new values for instant identification of restated numbers.

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Quick start

Compare an original 10-K with its amendment: 
curl -H "x-api-key: $SECAPI_API_KEY" \
  "https://api.secapi.ai/v1/filings/diff?accession_a=0000320193-24-000081&accession_b=0000320193-25-000003"

{
  "original": "0000320193-24-000081",
  "amendment": "0000320193-25-000003",
  "form": "10-K/A",
  "changes": [
    {
      "section": "Item 8 - Financial Statements",
      "type": "modification",
      "description": "Restated revenue figure for Q3 2024",
      "old_text": "Revenue: $94,930,000,000",
      "new_text": "Revenue: $94,880,000,000"
    },
    {
      "section": "Item 1A - Risk Factors",
      "type": "addition",
      "description": "New risk factor added",
      "new_text": "Regulatory changes in the European Union may impact..."
    }
  ],
  "total_changes": 12,
  "sections_affected": 3
}

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Use cases

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Restatement detection

Automatically detect when companies restate financial figures by diffing 10-K and 10-K/A filings. Flag the specific numbers that changed.

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Compliance monitoring

Regulatory teams can track what changed in amended filings from issuers they monitor without manually reviewing hundreds of pages.

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Audit trail creation

Build an auditable record of all changes between filing versions for legal, compliance, or research purposes.

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Risk factor monitoring

Track changes to Item 1A (Risk Factors) between annual filings to detect emerging risks and removed risks over time.

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API endpoints

EndpointDescription
GET /v1/filings/diffCompare two filing accession numbers
GET /v1/filings/amendmentsFind all amendments for a filing

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Why SEC API for filing diffs

FeatureSEC APIRaw EDGARsec-api.ioManual review
Structured diff outputYesNoNoN/A
Section-level groupingYesNoNoManual
Numeric change detectionYesNoNoManual
REST APIYesNoNoN/A
Any form typeYesManualNoManual
PricingPay-as-you-goFree (manual)N/ALabor cost

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Get started

Get your API key

Start comparing SEC filings in under 60 seconds. 150 free API calls (one-time).