13F Filings Explained
Every quarter, institutional investors managing over $100M report a snapshot of certain holdings to the SEC. The key detail: you see the snapshot late, and it does not reveal when trades happened.
The 13F Delay, In One Picture
Start with the simplest mental model: quarter ends, the snapshot waits, then the filing becomes public. It is useful because it is verified, but it is never live.
Simple rule
A 13F shows what a fund held on the last day of the quarter. You often do not see that snapshot until weeks later.
Example: Q3 report
The lag is the whole point to remember
Dates shown use a Sep 30 quarter end.
Quarter being reported
Jul 1 to Sep 30The investor can buy or sell at any point. The filing will not show the trade date or price.
SEC filing window
Oct 1 to Nov 14The Sep 30 holdings snapshot is not public yet. Managers have up to 45 days to file.
Public data
Nov 14 onwardOnce filed on EDGAR, Whale Radar can read the snapshot and compare it with the prior quarter.
Snapshot date
The filing reports positions held at quarter end, not every trade during the quarter.
Invisible to the public
The portfolio can keep changing while the reported snapshot waits to be filed.
Filing deadline
13F reports are due within 45 calendar days after quarter end, adjusted for weekends and holidays.
What you see
You are looking at a delayed quarter-end snapshot, not the investor's live portfolio.
Up to 45 days stale
If a manager files on the deadline, the visible holdings are from 45 days earlier.
Up to about 135 days since a trade
A position bought near the start of the quarter may not become visible until the filing arrives after quarter end.
Never a live portfolio
Use 13F data as a delayed research signal, then check current prices and company context.
Reading Between Filings
A single filing shows one delayed snapshot. Comparing two consecutive filings shows what changed between snapshots: new positions, additions, reductions, and exits.
Q3 2024 Filing
Report Date: Sep 30, 2024
Q4 2024 Filing
Report Date: Dec 31, 2024
Q3 2024 Filing
Report Date: Sep 30, 2024
Q4 2024 Filing
Report Date: Dec 31, 2024
Detected Changes
Key insight: 13F filings only show snapshots — we compare consecutive filings to detect changes. A stock that appears in Q4 but not Q3 is a NEW position. One that disappears is an EXIT.
The Price Uncertainty Window
13F filings tell you how many shares were reported at quarter end, but not when the investor bought or sold, or at what price. The trade could have happened anywhere in the quarter.
Position Snapshot
The filing shows shares held on the report date — not when they were bought.
Price Range
We can bound the trade price to the quarter's high/low range — $172 to $192 in this example.
45-Day Delay
You only see this data on the filing date — up to 45 days after the quarter ends.
Key insight: The exact transaction price is unknowable from 13F data. But we can bound it: if an investor added shares during Q3 2024, they paid somewhere between $172 and $192 per share. Whale Radar uses this range to estimate position values.
Methodology
Whale Radar treats each 13F as a delayed portfolio snapshot. We compare consecutive reports by CUSIP, classify position changes, and estimate portfolio weights from reported market values. The goal is to make institutional disclosure data easier to inspect, not to reconstruct every trade.
Change Classification
A holding is marked new when it appears in the latest report but not the prior one, exited when it disappears, and increased or reduced when the reported value changes for a continuing CUSIP.
Price and Timing
A 13F does not disclose trade dates or execution prices. Performance ranges use report dates, filing dates, and market prices as estimates rather than exact trade records.
Instrument Coverage
13F reports primarily cover US-listed long securities. Shorts, many international holdings, cash, bonds, private investments, and some derivatives can be absent or only partially represented.
Ticker Mapping
Holdings are reported by CUSIP. Ticker mappings are best effort and can lag corporate actions, share-class changes, delistings, or securities that do not map cleanly.
Not investment advice. Whale Radar is an analytical research tool based on public filings. The data is delayed, incomplete by design, and may contain mapping or reporting discrepancies.
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