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SEC 13F Institutional Holdings Tracker — by Filer

Pull SEC Form 13F-HR quarterly holdings for any institutional manager by CIK. One clean row per holding line — CUSIP, issuer name, share class, USD value, shares (or principal), put/call flag, investment discretion, sub-manager attribution, voting authority.

Built for cron (track "what did Berkshire just file?") and for ad-hoc research (pull 8 quarters of Bridgewater for a regime-change analysis). No auth, no scraping — pure SEC EDGAR.

Inputs

{
"filerCiks":["1067983","1350694"],
"lookbackQuarters":1,
"includeAmendments":false
}

Output

One row per <infoTable> line in the 13F. A single holding may appear multiple times if multiple sub-managers (under the same filer umbrella) hold separate blocks — that's how SEC structures the filing and we preserve it (deduplicate downstream if you want a clean per-CUSIP roll-up).

Daily / weekly cron pattern

13F filings drop 45 days after each calendar quarter (so May 15, Aug 14, Nov 14, Feb 14). A weekly cron with lookbackQuarters: 1 catches each new filing within days of it being posted.

{"filerCiks":["1067983","1350694","1423053"],"lookbackQuarters":1}

Real-world questions this answers

• Hedge-fund following. What did Berkshire just buy or sell vs. last quarter?
• Smart-money flow. Which 13F filers piled into NVDA last quarter?
• Risk monitoring. Track concentration in a single CUSIP across N filers.
• Manager attribution. Berkshire's 13F includes ~15 sub-managers (Buffett, Combs, Weschler, …) — otherManagerNames tells you whose desk this position is on.

What it doesn't do

• No 13F-NT (no holdings filings).
• No 13D / 13G (those are a separate filing type for >5% beneficial ownership — different actor).
• No put/call valuation analytics — raw filing data only.
• No automatic delta-vs-prior-quarter computation — pull lookbackQuarters: 2 and diff downstream if you need that.

Maintained by

vøiddo studio — small independent shop.