William D. Waddill

Companies

• Turnstone Biologics Corp.Board member Apr 16, 2024 to now¹
• Annexon, Inc.Board member Aug 16, 2021 to now²
• Arrowhead PharmaceuticalsBoard member Dec 27, 2017 to now³
• Protagonist Therapeutics, IncBoard member Aug 10, 2016 to now⁴
• Calithera Biosciences, Inc.Chief financial officer Oct 1, 2014 to Dec 1, 2016⁵
• OncoMedChief financial officer Jul 17, 2013 to Jul 23, 2013⁶

Holdings

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

Shares held

• APArrowhead Pharmaceuticals ARWR56,563 shares⁷$3.2M at $56.73Dec 19, 2025
• PTProtagonist Therapeutics, Inc PTGX7,825 shares⁸$1.0M at $134.03Jun 23, 2026

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

Recent filings

• Jun 23, 2026Sold 9,000 shares at $117.94 of Protagonist Therapeutics, Inc⁸
• Jun 23, 2026Exercised options 9,000 shares at $16.54 of Protagonist Therapeutics, Inc⁸
• Jun 10, 2026Sold 9,000 shares at $107.68 of Protagonist Therapeutics, Inc⁹
• Jun 10, 2026Exercised options 6,000 shares at $16.54 of Protagonist Therapeutics, Inc⁹
• Jun 10, 2026Exercised options 3,000 shares at $11.80 of Protagonist Therapeutics, Inc⁹
• May 29, 2026Sold 9,000 shares at $99.64 of Protagonist Therapeutics, Inc¹⁰
• May 29, 2026Exercised options 9,000 shares at $11.80 of Protagonist Therapeutics, Inc¹⁰
• Feb 6, 2026Sold 20,000 shares at $83.68 of Protagonist Therapeutics, Inc¹¹
• Feb 6, 2026Exercised options 20,000 shares at $8.31 of Protagonist Therapeutics, Inc¹¹
• Jan 2, 2026Granted 2,695 shares of Protagonist Therapeutics, Inc¹²
• Dec 19, 2025Sold 500 shares at $68.53 of Arrowhead Pharmaceuticals⁷
• Dec 19, 2025Sold 5,451 shares at $68.01 of Arrowhead Pharmaceuticals⁷
• Dec 19, 2025Sold 2,416 shares at $66.66 of Arrowhead Pharmaceuticals⁷
• Dec 16, 2025Granted 7,819 shares of Arrowhead Pharmaceuticals¹³
• Oct 10, 2025Sold 8,000 shares at $87.81 of Protagonist Therapeutics, Inc¹⁴
• Oct 10, 2025Sold 4,000 shares at $69.25 of Protagonist Therapeutics, Inc¹⁴
• Oct 10, 2025Exercised options 12,000 shares at $6.98 of Protagonist Therapeutics, Inc¹⁴
• Sep 22, 2025Sold 4,000 shares at $64.25 of Protagonist Therapeutics, Inc¹⁵
• Aug 27, 2025Sold 4,000 shares at $59.25 of Protagonist Therapeutics, Inc¹⁶
• Mar 17, 2025Sold 4,000 shares at $54.25 of Protagonist Therapeutics, Inc¹⁷
• Jan 2, 2025Granted 5,130 shares of Protagonist Therapeutics, Inc¹⁸
• Dec 18, 2024Granted 16,733 shares at $22.99 of Arrowhead Pharmaceuticals¹⁹
• Dec 17, 2024Sold 3,747 shares at $22.04 of Arrowhead Pharmaceuticals²⁰
• Dec 16, 2024Sold 3,748 shares at $21.90 of Arrowhead Pharmaceuticals²⁰
• Sep 10, 2024Sold 8,000 shares at $45.00 of Protagonist Therapeutics, Inc²¹