Insider · SEC Form 4 filer

Beth Seidenberg

Companies

Where they file as an insider

Latigo Biotherapeutics (LTGO) Director, 10% owner Latest filing Aug 10, 2026
Kyverna Therapeutics (KYTX) Director Latest filing May 27, 2026
Acelyrin (SLRN) Director Latest filing May 21, 2025
Vera Therapeutics (VERA) Director Latest filing Oct 28, 2024
Progyny (PGNY) Director Latest filing May 23, 2024

Track record

Did their buys beat the typical stock?

Open-market buys1
Quarters checked 6 months later1
Beat the typical stock —
Quarters too new to check0

Too soon to tell. 1 quarter has finished so far. We show a record once 3 have.

Kyverna Therapeutics (KYTX) Bought Dec 18, 2025 · $1000K · 133,333 shares Behind typical Dec 31, 2025 $9.40 → Jun 30, 2026 $8.91 · −5.2% (typical stock +4.7%)

Each row is one stock in one quarter, however many buys it took. We take the stock's price at the end of that quarter and again 6 months later, and compare it with the typical stock over the same dates. Prices are quarter-end values from funds' 13F reports (the middle value across 3 or more funds), through Sep 30, 2026. Moves past 3 times up or down, mostly stock splits, are left out. How we tested this.

Past results. This is data, not advice.

Where this data comes from. Insider trades, fund holdings, activist stakes and company results come from public SEC EDGAR filings (Forms 4, 13F, 13D/13G, 10-Q and 8-K). Congress trades come from the STOCK Act reports members file with the House Clerk and the Senate. Daily closing prices come from post-no-preference/stocks on DoltHub, a community-run database shared under CC BY-SA 4.0; the prices we show stay under that license. They are each day's close, not live or official exchange prices.

This is data, not investment advice. About StockToast · Your watchlist