William D. Porteous

Sits on 1 board. Last updated September 27, 2026

Time on boards

Boards served
1
Current seats
1
Board service
3 years
Director since
2023

3 years of board service in total across 1 board, counting each seat separately. Longest: BlackSky Technology Inc., 3 years.

3 years ยท Since 2023

Shareholder support

Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Date Company Transaction Shares Price Value
Sep 11, 2026 BlackSky Technology Inc. Grant or award +8,733 โ€” โ€”
Jun 30, 2026 BlackSky Technology Inc. Grant or award +805 โ€” โ€”
Mar 31, 2026 BlackSky Technology Inc. Grant or award +894 โ€” โ€”
Dec 31, 2025 BlackSky Technology Inc. Grant or award +1,200 โ€” โ€”
Dec 10, 2025 BlackSky Technology Inc. Grant or award +1,500 โ€” โ€”
Sep 30, 2025 BlackSky Technology Inc. Grant or award +1,116 โ€” โ€”
Sep 11, 2025 BlackSky Technology Inc. Grant or award +8,625 โ€” โ€”
Jun 30, 2025 BlackSky Technology Inc. Grant or award +1,093 โ€” โ€”
Mar 31, 2025 BlackSky Technology Inc. Grant or award +2,910 โ€” โ€”
Dec 31, 2024 BlackSky Technology Inc. Grant or award +2,085 โ€” โ€”
Dec 12, 2024 BlackSky Technology Inc. Open-market sale โˆ’570 $10.65 $6,071
Sep 30, 2024 BlackSky Technology Inc. Grant or award +4,746 โ€” โ€”
Sep 4, 2024 BlackSky Technology Inc. Grant or award +135,135 โ€” โ€”
Jun 30, 2024 BlackSky Technology Inc. Grant or award +21,028 โ€” โ€”
Mar 31, 2024 BlackSky Technology Inc. Grant or award +16,544 โ€” โ€”

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