Insider · SEC Form 4 filer

Robert Duggan

Past buys: 1 of 6 beat

Companies

Where they file as an insider

Summit Therapeutics (SMMT) Co-CEO, Director, 10% owner Latest filing Jun 12, 2026
Pulse Biosciences (PLSE) Director, 10% owner Latest filing May 11, 2026

Track record

Did their buys beat the typical stock?

Open-market buys28
Quarters checked 6 months later6
Beat the typical stock 1 of 6
Quarters too new to check2

1 of 6 checked quarters beat the typical stock. A past record is data, not a forecast.

Summit Therapeutics (SMMT) Bought Jun 4–12, 2026 · $51.4M · 3.91M shares Too new Too new. Its 6-month check uses prices as of Dec 31, 2026.
Pulse Biosciences (PLSE) Bought May 11, 2026 · $13M · 660,233 shares Too new Too new. Its 6-month check uses prices as of Dec 31, 2026.
Summit Therapeutics (SMMT) Bought Oct 21, 2025 · $500K · 26,680 shares Behind typical Dec 31, 2025 $17.49 → Jun 30, 2026 $14.57 · −16.7% (typical stock +4.7%)
Pulse Biosciences (PLSE) Bought Sep 10, 2025 · $508K · 34,659 shares Beat typical Sep 30, 2025 $17.70 → Mar 31, 2026 $21.59 · +22.0% (typical stock −3.4%)
Summit Therapeutics (SMMT) Bought Sep 10–11, 2025 · $5.98M · 338,394 shares Behind typical Sep 30, 2025 $20.66 → Mar 31, 2026 $18.96 · −8.2% (typical stock −3.4%)
Pulse Biosciences (PLES) Bought Dec 12, 2024 · $778K · 45,404 shares Not counted Not counted. We have no fund price for this stock on both Dec 31, 2024 and Jun 30, 2025.
Pulse Biosciences (PLSE) Bought Dec 11–13, 2024 · $1.92M · 111,310 shares Behind typical Dec 31, 2024 $17.41 → Jun 30, 2025 $15.09 · −13.3% (typical stock −3.4%)
Pulse Biosciences (PLSE) Bought Sep 11–12, 2024 · $2.28M · 157,940 shares Behind typical Sep 30, 2024 $17.54 → Mar 31, 2025 $16.09 · −8.3% (typical stock −7.5%)
Pulse Biosciences (PLSE) Bought Nov 17–Dec 12, 2023 · $9.55M · 1.04M shares Behind typical Dec 31, 2023 $12.24 → Jun 30, 2024 $11.19 · −8.6% (typical stock −1.2%)

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