Michael J. Malecek

Companies

• PROTHENA CORP PUBLIC LTD COGeneral counsel Feb 25, 2022 to now¹
• PROTHENA CORP PUBLIC LTD COOfficer Jul 3, 2019 to Nov 19, 2021²

Holdings

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

Shares held

• PPPROTHENA CORP PUBLIC LTD CO PRTA80,000 shares³$676.8K at $8.46Jul 28, 2025

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

Recent filings

• Jul 28, 2025Granted 80,000 shares of PROTHENA CORP PUBLIC LTD CO³
• Sep 27, 2023Sold 404 shares at $48.31 of PROTHENA CORP PUBLIC LTD CO⁴
• Sep 27, 2023Sold 4,596 shares at $47.29 of PROTHENA CORP PUBLIC LTD CO⁴
• Sep 27, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁴
• Aug 30, 2023Sold 14 shares at $56.21 of PROTHENA CORP PUBLIC LTD CO⁵
• Aug 30, 2023Sold 2,664 shares at $55.39 of PROTHENA CORP PUBLIC LTD CO⁵
• Aug 30, 2023Sold 2,322 shares at $54.58 of PROTHENA CORP PUBLIC LTD CO⁵
• Aug 30, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁵
• Jul 26, 2023Sold 620 shares at $63.40 of PROTHENA CORP PUBLIC LTD CO⁶
• Jul 26, 2023Sold 1,903 shares at $62.69 of PROTHENA CORP PUBLIC LTD CO⁶
• Jul 26, 2023Sold 2,477 shares at $61.78 of PROTHENA CORP PUBLIC LTD CO⁶
• Jul 26, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁶
• Jun 28, 2023Sold 710 shares at $70.84 of PROTHENA CORP PUBLIC LTD CO⁷
• Jun 28, 2023Sold 3,050 shares at $69.89 of PROTHENA CORP PUBLIC LTD CO⁷
• Jun 28, 2023Sold 1,240 shares at $69.07 of PROTHENA CORP PUBLIC LTD CO⁷
• Jun 28, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁷
• May 31, 2023Sold 711 shares at $65.98 of PROTHENA CORP PUBLIC LTD CO⁸
• May 31, 2023Sold 1,078 shares at $65.20 of PROTHENA CORP PUBLIC LTD CO⁸
• May 31, 2023Sold 3,211 shares at $64.16 of PROTHENA CORP PUBLIC LTD CO⁸
• May 31, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁸
• Apr 26, 2023Sold 320 shares at $54.25 of PROTHENA CORP PUBLIC LTD CO⁹
• Apr 26, 2023Sold 4,680 shares at $53.40 of PROTHENA CORP PUBLIC LTD CO⁹
• Apr 26, 2023Exercised options 5,000 shares at $10.27 of PROTHENA CORP PUBLIC LTD CO⁹
• Mar 29, 2023Sold 2,266 shares at $49.28 of PROTHENA CORP PUBLIC LTD CO¹⁰
• Mar 29, 2023Sold 2,734 shares at $48.81 of PROTHENA CORP PUBLIC LTD CO¹⁰