SEC 13F Holdings — Hedge Fund Portfolios & Who Owns a Stock

13F holdings from SEC filings: see what hedge funds such as Pershing Square or Bridgewater (and large holders such as Berkshire Hathaway) own, and what they bought or sold last quarter. Every investment manager with over $100M in US equities files a 13F with the SEC each quarter. This Actor turns those filings into a table: one row per position, with value, shares, portfolio weight and the change against the previous quarter. Or flip it around: enter a ticker or CUSIP and see which of the listed institutions hold it.

You enter	You get
A fund name (Pershing Square, Bridgewater, Berkshire Hathaway) or any 13F filer's CIK	one row per position: issuer, CUSIP, value, shares, % of portfolio, rank, and NEW / ADDED / REDUCED / UNCHANGED / SOLD OUT with share change
A ticker or CUSIP (AAPL, 037833100)	one row per institution holding it: shares, value, % of that manager's portfolio and the change vs. the previous quarter

This Actor is our own project, not an official SEC product. Data comes from SEC EDGAR. 13F shows long US-listed positions at quarter end (filed up to 45 days later), not today's portfolio, shorts or cash.

Example row (Pershing Square, 13F for 2026-03-31)

Input: {"managers": ["Pershing Square"], "topN": 10}. Brookfield was Pershing Square's largest position at 17.6 % of the portfolio, reduced by 2.8 % against the previous quarter. Pershing Square's newer 13F for Q2 2026 contains no positions table, so the output uses the latest filing with positions and says so in periodNote.

{
  "type": "holding",
  "managerName": "Pershing Square Capital Management, L.P.",
  "managerCik": "0001336528",
  "period": "2026-03-31",
  "filingDate": "2026-05-15",
  "periodNote": "Newer 13F-NT filed 2026-08-14 for period 2026-06-30 reports no holdings table of its own (notice or confidential treatment); 2026-03-31 is the latest filing with positions.",
  "portfolioValueUsd": 13714299861,
  "positionsCount": 11,
  "rank": 1,
  "issuer": "BROOKFIELD CORP",
  "titleOfClass": "CL A LTD VT SH",
  "cusip": "11271J107",
  "valueUsd": 2415946008,
  "shares": 59697208,
  "portfolioWeightPct": 17.616,
  "changeType": "REDUCED",
  "previousShares": 61403089,
  "sharesChange": -1705881,
  "sharesChangePct": -2.78,
  "previousValueUsd": 2817787754
}

Example row (Berkshire Hathaway, Q2 2026)

{
  "type": "holding",
  "managerName": "Berkshire Hathaway Inc",
  "period": "2026-06-30",
  "filingDate": "2026-08-14",
  "portfolioValueUsd": 299253556246,
  "positionsCount": 29,
  "rank": 1,
  "issuer": "APPLE INC",
  "cusip": "037833100",
  "valueUsd": 65950296923,
  "shares": 227917808,
  "portfolioWeightPct": 22.038,
  "changeType": "UNCHANGED",
  "previousShares": 227917808,
  "sharesChange": 0,
  "sharesChangePct": 0,
  "previousValueUsd": 57843260493
}

Also in every row: managerCik, titleOfClass, putCall, sharesType, investmentDiscretion, votingSole / votingShared / votingNone and filingUrl (the SEC filing).

Who uses it

• Investors and newsletter writers: follow "smart money" — new positions and exits of top funds every quarter.
• Analysts and IR teams: see which institutions hold, buy or sell a stock you cover.
• Fintech and AI apps: a structured, sourced feed of institutional portfolios for dashboards, screeners or LLM agents.

Why this one

• Changes, not just lists. Quarter-over-quarter comparison is built in, including positions the fund fully sold.
• Clean numbers. Positions split across sub-managers are summed per security; options (puts/calls) are kept separate and can be switched off. Values filed before 2023 (reported in thousands) are converted to dollars.
• Amendments handled. Restatements replace the original report; "new holdings" amendments (confidential positions disclosed later) are added to the quarter.
• Any 13F filer. 30 well-known managers work by name; any other by CIK (the number in the manager's SEC EDGAR URL).
• Official source, fast. Straight from SEC EDGAR — Berkshire takes about 3 seconds, Citadel's 13,000+ positions a few more.

Who holds a stock? (holder mode)

Enter a ticker or CUSIP in securities (for example ["AAPL"] or ["037833100"]) and get which institutions hold it: one row per manager with shares, value, % of that manager's portfolio and the change against the previous quarter (NEW / ADDED / REDUCED). By default about 30 major institutions are scanned (Vanguard, BlackRock, Berkshire, Bridgewater, Citadel...); list your own managers (CIKs) to scan a different set. Rows are priced like holdings, one per holder. Tickers outside the built-in table are looked up by issuer name in the SEC's company list; the row shows the CUSIP it matched.

Example input: {"securities": ["AAPL", "COST"], "includeOptions": false, "maxResults": 40}. A real cloud run with it (Q2 2026 filings) returned about 30 holder rows in roughly 100 seconds for under $0.01 of platform usage.

Example row (holder mode, AAPL)

{
  "type": "holder",
  "query": "AAPL",
  "ticker": "AAPL",
  "cusip": "037833100",
  "issuer": "APPLE INC",
  "titleOfClass": "COM",
  "putCall": null,
  "managerName": "Berkshire Hathaway Inc",
  "managerCik": "0001067983",
  "period": "2026-06-30",
  "filingDate": "2026-08-14",
  "shares": 227917808,
  "sharesType": "SH",
  "valueUsd": 65950296923,
  "portfolioWeightPct": 22.038,
  "portfolioValueUsd": 299253556246,
  "changeType": "UNCHANGED",
  "previousShares": 227917808,
  "sharesChange": 0,
  "sharesChangePct": 0,
  "filingUrl": "https://www.sec.gov/Archives/edgar/data/1067983/000119312526352200/0001193125-26-352200-index.htm"
}

Excerpt from the same run (shares held, Q2 2026 vs. previous quarter):

Holder	Stock	Shares	% of holder's portfolio	Change
Vanguard Group	Apple	1,426,283,914	5.62	ADDED
BlackRock	Apple	1,162,996,939	5.00	ADDED
Citadel Advisors	Apple	7,296,076	0.24	ADDED
Two Sigma	Costco	1,006,231	0.68	ADDED
D. E. Shaw	Costco	873,316	0.39	REDUCED

This Actor is our own project, not an official SEC product. The holder scan covers the managers it lists, not every 13F filer, so it is not a complete register of owners.

Pricing

Pay per holding row. Error rows are free. Use Top N or Min. position value to get only the positions you care about, and set a maximum cost per run — the Actor stops cleanly when it is reached. Each position costs a fraction of a cent, so 1 000 positions cost about $1 (see the pricing on the Actor page for the exact current rate).

Input

Field	Default
securities	—	Holder mode: tickers or CUSIPs, returns the institutions holding them
managers	—	CIKs or known names (in holder mode: the set to scan)
quarters	1	Latest N quarters per manager
compareWithPrevious	true	Change type and share change
includeSoldOut	true	Rows for exited positions
topN	0 (all)	Largest N positions per quarter (+ up to N largest exits)
minValueUsd	—	Skip small positions
includeOptions	true	Put/call rows
maxResults	5000	Total row limit

Good to know

• 13F covers long positions in US-listed equities, ETFs, options and some convertibles. It does not show shorts, cash, bonds or non-US holdings. Reports are due 45 days after quarter end, so they show the portfolio at quarter end, not today.
• Institutions only. Filers that are individual people are refused, and names, signatures and phone numbers from the filings are never returned.
• The Actor follows the SEC's fair-access rules (identifies itself, stays under 10 requests per second). For large runs you can add your contactEmail, which is sent only to sec.gov.
• Not affiliated with the U.S. Securities and Exchange Commission. Not investment advice.