Chirfi Guindo

Companies

• Beam TherapeuticsBoard member Dec 4, 2024 to now¹
• Merck & Co.Chief Marketing Officer Jul 8, 2022 to now²
• BiogenEVP Glob. Mkt Acc & Cust Innov Nov 16, 2017 to Feb 23, 2022³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Merck & Co. MRK36,670 shares⁴$5.5M at $149.02Aug 13, 2026
• Biogen BIIB7,364 shares⁵$1.8M at $241.24Feb 18, 2022

As of each latest filing. The line shows shares held over time.

Recent filings

• Aug 13, 2026Sold 10,000 shares at $135.00 of Merck & Co.⁴
• Aug 6, 2026Sold 15,000 shares at $131.00 of Merck & Co.⁶
• Apr 29, 2026Shares withheld for tax 969 shares at $110.03 of Merck & Co.⁷
• Apr 29, 2026Exercised options 1,967 shares at $110.03 of Merck & Co.⁷
• Feb 12, 2026Sold 10,000 shares at $121.46 of Merck & Co.⁸
• Feb 9, 2026Sold 10,000 shares at $118.41 of Merck & Co.⁹
• Feb 5, 2026Sold 20,000 shares at $121.88 of Merck & Co.¹⁰
• Jan 26, 2026Granted 9,865 shares at $107.40 of Merck & Co.¹¹
• Aug 4, 2025Shares withheld for tax 18,175 shares at $79.29 of Merck & Co.¹²
• Aug 4, 2025Exercised options 36,903 shares at $79.29 of Merck & Co.¹²
• Jan 27, 2025Granted 28,158 shares at $97.94 of Merck & Co.¹³
• Aug 5, 2024Shares withheld for tax 17,412 shares at $115.20 of Merck & Co.¹⁴
• Aug 5, 2024Exercised options 36,901 shares at $115.20 of Merck & Co.¹⁴
• Aug 3, 2023Shares withheld for tax 17,989 shares at $105.70 of Merck & Co.¹⁵
• Aug 3, 2023Exercised options 36,901 shares at $105.70 of Merck & Co.¹⁵
• Feb 18, 2022Shares withheld for tax 879 shares at $209.79 of Biogen⁵
• Feb 18, 2022Exercised options 1,981 shares of Biogen⁵
• Feb 12, 2022Shares withheld for tax 1,189 shares at $214.59 of Biogen¹⁶
• Feb 12, 2022Shares withheld for tax 593 shares at $214.59 of Biogen¹⁶
• Feb 12, 2022Exercised options 1,336 shares of Biogen¹⁶
• Feb 12, 2022Shares withheld for tax 560 shares at $214.59 of Biogen¹⁶
• Feb 12, 2022Exercised options 1,261 shares of Biogen¹⁶
• Jan 19, 2022Granted 3,088 shares of Biogen¹⁷