Purpose
13F.chat is an AI tool for U.S. equity institutional holdings research scenarios, with the core goal of turning U.S. Securities and Exchange Commission (SEC) 13F disclosure filings into usable research information. 13F filings are quarterly holdings reports disclosed by institutional investors whose assets under management meet the threshold; the raw data is large in volume and tends to be table-oriented, making it difficult to understand. The question 13F.chat attempts to answer is: what top fund managers actually bought, added to, and sold in the most recent quarter, how many dollars are involved, and whether these actions are still worth researching now.
Main Capabilities
According to the official introduction, 13F.chat's capabilities revolve around "following smart money":
- Quarterly Holdings Change Tracking: Tracks well-known fund managers' actual quarterly actions, including buys, adds, and sells, and presents the scale in U.S. dollars.
- Estimated Cost: Provides estimated cost information for transactions to help judge the entry range.
- AI Explanation: Pairs holdings actions with AI-generated explanations to help judge whether the action still has reference value.
- Institutional Entity Research: For example, Berkshire Hathaway's 13F holdings and portfolio pages, showing the latest disclosed holdings, concentration, industry exposure, and accompanied by organized public research discussions.
- 13F Discovery Radar: Tracks the latest rotation signals from each manager, industry, and high-conviction individual stock actions; the official example covers the period from 2026-03-31 to 2026-06-30.
- Capital Rotation Timeline: Displays active capital inferred by share count with stacked industry bars, and tracks SPY (S&P 500 ETF) with an amber curve.
- Macro Rotation Heatmap: Ranks current 13F exposure by region, with color indicating the active capital momentum reflected in the latest disclosure filings.
- Leaderboard-style Views: Including largest industry rotations, highest-conviction individual stock actions, largest manager holdings, and more.
- AI Strategy Optimization Description: The official page states that each default workspace runs a phased optimization process—baseline, factor evidence, challenger proposals, out-of-sample evaluation, and finally a deterministic verdict, and only accepted candidates change the actual strategy.
- Public Workspaces and Daily Research: The official page mentions that the packaged directory snapshot includes 135 publicworkspaces and provides daily updated public research content (with an example date of October 15, 2026).
How to Use
13F.chat is provided as a web application, and the official website address is https://13f.chat/ . Users can visit the site to browse public workspaces, institutional entity research pages, and various rotation views. The materials do not provide explanations of account registration, paid plans, APIs, or specific operating steps; these contents are not yet available.
Applicable Scenarios
Suitable for researchers, investors, and investment research practitioners who follow U.S. equity institutional holdings and wish to quickly understand well-known fund managers' quarterly position adjustments, to help form research leads, observe industry and regional rotation trends, and track high-conviction individual stock actions.
Limitations
The official statement clearly states that: the content of 13F.chat is for informational and research purposes only and does not constitute investment advice. In addition, 13F disclosures themselves are lagging (disclosed quarterly and may be delayed), and the official website does not explain in the available materials the data coverage, update delays, accuracy, or error handling methods; these details are not yet available.
