SEC Amendments Review
Review amendments to SEC filings and identify material changes or corrections for public companies using the Octagon MCP server.
Prerequisites
Ensure Octagon MCP is configured in your AI agent (Cursor, Claude Desktop, Windsurf, etc.). See references/mcp-setup.md for installation instructions.
Workflow
1. Identify Analysis Parameters
Determine the following before querying:
- Ticker: Stock symbol (e.g., AAPL, MSFT, GOOGL)
- Time Period (optional): Recent amendments, specific date range
- Filing Type (optional): Specific amendment types of interest
2. Execute Query via Octagon MCP
Use the octagon-agent tool with a natural language prompt:
Review recent amendments to SEC filings for <TICKER> and identify material changes or corrections.MCP Call Format:
{
"server": "octagon-mcp",
"toolName": "octagon-agent",
"arguments": {
"prompt": "Review recent amendments to SEC filings for AMZN and identify material changes or corrections."
}
}3. Expected Output
The agent returns structured amendment analysis including:
Recent Amendments:
- Form 144/A: Amended report of proposed securities sales
- Filing date and description
- Material changes identified
Related Filings:
- Original filings being amended
- Subsequent transactions (e.g., bond offerings)
Data Sources: octagon-sec-agent, octagon-web-search-agent
4. Interpret Results
See references/interpreting-results.md for guidance on:
- Understanding amendment types
- Assessing materiality of changes
- Tracking restatement patterns
- Evaluating correction significance
Example Queries
General Amendment Review:
Review recent amendments to SEC filings for AMZN and identify material changes or corrections.10-K Amendments:
Has TSLA filed any 10-K/A amendments in the past year and what changes were made?Restatement Search:
Identify any financial restatements or 10-Q/A amendments filed by META in 2025.S-1 Amendment Tracking:
Track the S-1/A amendments filed by Reddit during their IPO process.8-K Corrections:
Find any 8-K/A amendments for NVDA that corrected prior disclosures.Proxy Amendments:
Review DEF 14A amendments for AAPL and identify changes to compensation disclosures.Amendment Types
Periodic Report Amendments
| Form | Original | Amendment |
|---|---|---|
| Annual Report | 10-K | 10-K/A |
| Quarterly Report | 10-Q | 10-Q/A |
| Current Report | 8-K | 8-K/A |
| Transition Report | 10-KT | 10-KT/A |
Registration Statement Amendments
| Form | Original | Amendment |
|---|---|---|
| IPO Registration | S-1 | S-1/A |
| Shelf Registration | S-3 | S-3/A |
| M&A Registration | S-4 | S-4/A |
| Employee Plans | S-8 | S-8/A |
Proxy Statement Amendments
| Form | Original | Amendment |
|---|---|---|
| Definitive Proxy | DEF 14A | DEFA14A |
| Preliminary Proxy | PRE 14A | PREA14A |
| Contested Proxy | DEFC14A | N/A |
Other Amendments
| Form | Description |
|---|---|
| Form 144/A | Amended proposed securities sale |
| Schedule 13D/A | Amended beneficial ownership (>5%) |
| Schedule 13G/A | Amended passive investor disclosure |
| Form 3/A, 4/A, 5/A | Amended insider ownership |
Reasons for Amendments
Financial Restatements
| Reason | Severity |
|---|---|
| Accounting Error | High |
| Revenue Recognition | High |
| Expense Timing | Medium |
| Classification Error | Medium |
| Rounding/Typo | Low |
Disclosure Updates
| Reason | Typical Content |
|---|---|
| Additional Information | Expanded details |
| Clarification | Improved explanation |
| Correction | Fixed errors |
| Subsequent Events | New developments |
| Exhibit Updates | New or corrected exhibits |
Registration Statement Updates
| Reason | Purpose |
|---|---|
| SEC Comments | Response to staff review |
| Pricing Update | Final terms |
| Financial Update | More recent financials |
| Material Change | Business developments |
| Risk Factor Update | New risks identified |
Materiality Assessment
High Materiality Amendments
| Type | Indicators |
|---|---|
| Restatement | Changed reported numbers |
| Control Weakness | Internal control issues |
| Regulatory | Government action response |
| Legal | Litigation developments |
| M&A | Deal term changes |
Medium Materiality Amendments
| Type | Indicators |
|---|---|
| Clarification | Expanded disclosure |
| Reclassification | Changed categories |
| Exhibit | New supporting documents |
| Officer | Management updates |
Low Materiality Amendments
| Type | Indicators |
|---|---|
| Typographical | Spelling, formatting |
| Administrative | Signatures, dates |
| Cross-reference | Citation fixes |
| Exhibit | Technical corrections |
Amendment Analysis Framework
Key Questions
- What changed? - Specific sections modified
- Why? - Stated reason for amendment
- When? - Timing relative to original
- How material? - Impact on financials/operations
- Pattern? - History of amendments
Red Flags
- Frequent restatements - Recurring accuracy issues
- Delayed amendments - Long gaps from original
- Material weakness - Control deficiencies
- SEC comment response - Regulatory concerns
- Multiple rounds - Repeated amendments
- Downward revisions - Reduced financials
S-1/A Amendment Tracking
IPO Amendment Progression
| Amendment | Typical Content |
|---|---|
| S-1/A #1 | SEC comment responses |
| S-1/A #2 | Additional responses, updates |
| S-1/A #3+ | Further refinements |
| Final S-1/A | Pricing, final terms |
Key Changes to Track
| Section | What Changes |
|---|---|
| Risk Factors | New risks, updated language |
| Financials | More recent quarters |
| Valuation | Price range updates |
| Use of Proceeds | Refined allocation |
| Shares Offered | Final share count |
10-K/A and 10-Q/A Analysis
Common Amendment Reasons
| Reason | Frequency |
|---|---|
| Restatement | Uncommon, serious |
| Control Disclosure | Moderate |
| Exhibit Filing | Common |
| Signature | Common |
| XBRL Correction | Common |
Financial Impact Assessment
| Change | How to Assess |
|---|---|
| Revenue | Compare restated vs. original |
| Earnings | Impact on EPS, net income |
| Balance Sheet | Asset/liability changes |
| Cash Flow | Operating cash adjustments |
| Ratios | Covenant, metric impacts |
8-K/A Analysis
Amendment Purposes
| Purpose | Content |
|---|---|
| Correction | Fix errors in original |
| Additional Info | Complete disclosure |
| Exhibit | Add omitted documents |
| Financial Statements | Required within 71 days |
Timing Considerations
| Timing | Interpretation |
|---|---|
| Same day | Quick correction |
| Within week | Discovered error |
| Within month | Deliberate update |
| Extended | Potential concern |
Tracking Amendment Patterns
Company History
Track over time:
- Frequency of amendments
- Types filed
- Reasons stated
- Time to amend
Peer Comparison
Compare to industry:
- Amendment frequency
- Types of corrections
- Materiality levels
- Response times
Analysis Tips
- Compare versions: Use SEC compare tools to see exact changes.
- Read cover page: Amendment reason often stated upfront.
- Check exhibits: Often key documents added/corrected.
- Note timing: Gaps between filings reveal issues.
- Track patterns: Recurring amendments signal problems.
- Cross-reference 8-Ks: Material amendments often disclosed.
Use Cases
- Due diligence: Identify correction history
- Risk assessment: Track restatement patterns
- IPO analysis: Monitor S-1 amendment progression
- Governance review: Evaluate filing quality
- Compliance monitoring: Track regulatory responses