Yvonne Greenstreet

Chief Executive Officer at Alnylam Pharmaceuticals Inc.

Sits on 1 board. Last updated September 28, 2026

Time on boards

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

4 years of board service in total across 1 board, counting each seat separately. Longest: Alnylam Pharmaceuticals Inc., 3 years.

Alnylam Pharmaceuticals Inc. Director ยท Chief Executive Officer
3 years ยท Since 2023

Chief executive roles

Alnylam Pharmaceuticals Inc. ยท Chief Executive Officer
Dates unknown

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
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’194 $447.98 $86,908
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’450 $449.92 $202,464
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’195 $450.92 $87,929
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’514 $451.99 $232,323
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’1,646 $452.96 $745,572
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’2,716 $454.04 $1,233,173
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’1,204 $454.84 $547,627
Aug 18, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’60 $455.82 $27,349
Aug 15, 2025 Alnylam Pharmaceuticals Inc. Grant or award +14,252 โ€” โ€”
Jun 2, 2025 Alnylam Pharmaceuticals Inc. Option exercise +12,080 $119.13 $1,439,090
Jun 2, 2025 Alnylam Pharmaceuticals Inc. Option exercise +7,217 $118.05 $851,967
Jun 2, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’19,297 $306.00 $5,904,882
May 30, 2025 Alnylam Pharmaceuticals Inc. Option exercise +12,081 $119.13 $1,439,210
May 30, 2025 Alnylam Pharmaceuticals Inc. Option exercise +19,559 $118.05 $2,308,940
May 30, 2025 Alnylam Pharmaceuticals Inc. Open-market sale โˆ’25,469 $304.00 $7,742,576

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