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

1. What changed? - Specific sections modified
2. Why? - Stated reason for amendment
3. When? - Timing relative to original
4. How material? - Impact on financials/operations
5. Pattern? - History of amendments

Red Flags

1. Frequent restatements - Recurring accuracy issues
2. Delayed amendments - Long gaps from original
3. Material weakness - Control deficiencies
4. SEC comment response - Regulatory concerns
5. Multiple rounds - Repeated amendments
6. 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

1. Compare versions: Use SEC compare tools to see exact changes.

2. Read cover page: Amendment reason often stated upfront.

3. Check exhibits: Often key documents added/corrected.

4. Note timing: Gaps between filings reveal issues.

5. Track patterns: Recurring amendments signal problems.

6. 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