Ask about Berkshire Hathaway, Top 20 US Stocks, S&P 500 holdings, risk, factor style, and optimization results.
13F.chat — AI Research Terminal for 13F
A new AI frontier for quantitative investing turns any investment idea into unprecedented quantitative investing
Enter a 13F thesis, constraint, or challenging investment idea. 13F.chat turns 13F filings into fund screens, holdings insight, and a chat-ready optimization path you can test.
Data as of 2026-05-07114 funds
Research feed
Hot Optimization and Insight Reads
A compact 13F.chat feed that alternates tested strategy pages with fund-level AI insight pages, so every 13F chat can start from fresh filings.
Popular optimization and insight articles
Superinvestor portfolio updates
All fundsLatest research
Fresh Optimizations and Insights
The newest strategy runs and AI-written fund observations, split into two fast-scanning lists.
Latest Insights
Latest Optimizations
Holdings movement
What Changed Recently
Largest 13F position changes, ranked by absolute weight delta, from the latest filings across all 73 funds.
| Ticker | Action | Change | Date | Fund |
|---|---|---|---|---|
| GOOGL | Increase | +4.49 pts | 2026-04-30 | S&P 500 Communication Services Sector |
| AMZN | Increase | +4.43 pts | 2026-04-30 | S&P 500 Consumer Discretionary Sector |
| MU | Increase | +3.62 pts | 2026-04-30 | S&P 500 Momentum |
| CVX | Exit | -2.75 pts | 2026-04-30 | Dow Jones Industrial Average |
| CF | Exit | -2.54 pts | 2026-04-30 | S&P 500 Materials Sector |
| MU | Increase | +2.29 pts | 2026-04-30 | S&P 500 Technology Sector |
| GOOGL | Increase | +2.16 pts | 2026-04-30 | Top 20 US Stocks |
| UNH | Increase | +2.04 pts | 2026-04-30 | S&P 500 Health Care Sector |
| PPL | Exit | -1.99 pts | 2026-04-30 | S&P 500 Utilities Sector |
| CSGP | Exit | -1.95 pts | 2026-04-30 | S&P 500 Real Estate Sector |
High-conviction ideas
High-Conviction Ideas
Funds whose top-10 concentration exceeds 60% with positive baseline alpha — a useful 13F research starting point, with the usual 13F caveat that shorts and derivatives are not disclosed.
Strategy lab
Strategy Optimization Results
13F.chat compares average metrics across all 73 funds for each of the four bootstrap strategies — a baseline view for 13F portfolio optimization.
| Method | Alpha | Sharpe | Max DD | Ann. return | Funds |
|---|---|---|---|---|---|
| Baseline | -0.44% | 0.64 | -39.52% | 11.33% | 114 |
| Momentum Screen | +0.54% | 0.60 | -44.12% | 12.57% | 114 |
| Value Screen | -1.89% | 0.50 | -51.34% | 9.81% | 114 |
| Combo Equal | +0.61% | 0.64 | -43.66% | 13.46% | 114 |
Reading 13F
Why 13F Needs AI Context
13F is public data, but not an action signal. Use 13F.chat to chat with AI and turn raw filings into investable insight — three caveats are worth keeping in mind before you act.
Disclosure delay
13F is reported up to 45 days after quarter end — by the time you see it, the manager may have already moved. Use 13F.chat AI to surface the changes that still matter.
Long positions only
13F does not include shorts, derivatives, or foreign assets — you are looking at part of the picture. Chat with our AI to fill the gaps with peer overlap and sector context.
Research signal, not a buy signal
Treat 13F as a starting point for fundamental research and combine it with valuation and momentum context. 13F.chat AI does that synthesis for you.
Browse
Explore the Universe
Search the 13F.chat universe across all 114 funds by name, manager, or ticker — then open a 13F chat workspace or jump into a curated slice below.
