Shibui Finance gives Claude access to 335,000 Schedule 13D and 13G filings from SEC EDGAR, covering 1993 to present. These filings are triggered when an investor crosses the 5% ownership threshold in a public company. Schedule 13D signals activist intent - the investor plans to influence the company. Schedule 13G is the passive alternative for institutional holders with no activist agenda. Each filing includes the filer identity, the target company, the schedule type, and the filing date. An entity resolution layer with 38 verified activist investor groups lets you track activists across all their positions. You can cross-reference filings with daily price data to study what happened to stocks after a 13D was filed. Free, no API key.
13D vs 13G: what each filing means
When an investor acquires more than 5% of a company's outstanding shares, the SEC requires a disclosure. The form they file signals their intent:
| Schedule 13D | Schedule 13G | |
|---|---|---|
| Intent | Activist - plans to influence or change the company | Passive - holds for investment only |
| Typical filer | Activist funds, corporate raiders, strategic investors | Index funds, pension funds, passive institutions |
| Filing deadline | 10 days after crossing 5% | 45 days after calendar year-end (passive investors) |
| Signal to market | Strong - often precedes proxy fights, board changes, M&A proposals | Routine accumulation, minimal signal |
| Amendment frequency | Must amend within 10 days of material changes | Annual amendment only (unless converted to 13D) |
A 13D filing is one of the earliest public signals of activist involvement. When Carl Icahn, Elliott Management, or Starboard Value files a 13D, it often precedes months of campaign activity: public letters to management, board nominations, shareholder proposals, or tender offers.
Find recent 13D filings
Screen the entire market for new 13D filings to spot activist positions as they are disclosed. You can filter by time period, company size, and sector.
"Find all Schedule 13D filings in the last 90 days where the target company has a market cap above $1B. Show the target company, filer name, filing date, and current market cap. Sort by filing date."
Claude queries the beneficial_ownership table, joins with valuation data for market cap, and filters to 13D (activist intent) filings. The result is a screening list of companies that recently attracted activist attention, ranked by recency.
Track activist investors across companies
Shibui resolves filer identities across name variants and CIK numbers. The database includes a verified list of 38 known activist investor groups, so you can filter specifically for activist filings or follow an activist's portfolio of positions across companies.
"Show me all 13D and 13G filings by activist investors in 2025 and 2026. Group by activist group, showing the number of target companies and the most recent filing date for each."
"List all companies where Elliott Management has filed a Schedule 13D. Show the target company, filing date, and current market cap."
The CIK caveat
In 13D and 13G filings, the SEC identifier (CIK) belongs to the filer, the investor who acquired the position, not the target company. Shibui resolves both sides automatically, so you can search by investor ("Which companies did Elliott Management target?") or by company ("Which investors filed on Apple?") without worrying about the underlying identifiers.
What happened after the 13D filing?
The most valuable question about activist filings is not just who filed, but what happened to the stock afterward. By joining 13D filing dates with daily price data, you can measure the market's reaction and the longer-term outcome.
"For all 13D filings in 2025 targeting companies with market cap above $500M, what was the average stock price change 30, 60, and 90 days after the filing date? Compare to a baseline of all large-cap stocks over the same period."
This is an event study over activist filings. Claude joins each filing date with the target company's price at fixed forward offsets and aggregates across all qualifying events. The database has daily prices back to 1962 for cross-referencing.
Coverage and limitations
Coverage: 335,000 beneficial ownership filings (13D + 13G combined), 1993 to present, covering NYSE and NASDAQ filers. SGML filing headers are fully parsed for filer and target identification.
What's included: Filing date, schedule type (13D or 13G), filer identity and CIK, target company identity and ticker, activist group classification, amendment tracking.
What's not included: The exact ownership percentage is not currently extracted from the filing body (XML content parsing is deferred). The number of shares held and the purchase price history are in the filing documents but not yet parsed into structured fields. For those details, Claude can follow the EDGAR document links.
Questions
What is a Schedule 13D filing?
A Schedule 13D is an SEC filing required when an investor acquires more than 5% of a public company and intends to influence it. The "D" signals activist intent. It is one of the earliest public signals of activist involvement and often precedes proxy fights, board nominations, or strategic proposals.
What is the difference between 13D and 13G?
Both are required when crossing the 5% ownership threshold. Schedule 13D signals activist intent - the investor plans to influence the company. Schedule 13G is the passive alternative for institutional holders with no activist agenda. A 13D is a market event; a 13G is routine reporting.
Can I track activist investors across multiple companies?
Yes. Shibui Finance includes entity resolution with 38 verified activist investor groups. Ask Claude to show all 13D filings by a specific activist across all target companies, with filing dates, company names, and market cap.
How many 13D and 13G filings does Shibui Finance have?
335,000 beneficial ownership filings from SEC EDGAR, 1993 to present. Each includes filer identity, target company, schedule type, filing date, and amendment status. Filer entities are resolved across name variants for cross-company tracking.
Related SEC filing pages:
- SEC Filings Hub — overview of all filing types and data coverage
- Insider Buying Stocks — market-wide screen for Form 4 purchases
- Insider Trading Tracker — Form 4 deep-dive: transaction codes, timing, cluster detection
- Track Filing Activity — triage the daily 8-K feed by market cap