David Kirske

Companies

• X4 Pharmaceuticals, IncChief financial officer Aug 14, 2025 to now¹
• CTI BioPharmaChief financial officer Oct 3, 2017 to Jun 26, 2023²
• CTI BioPharmaOfficer Aug 3, 2017 to Aug 3, 2017³

Holdings

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

Shares held

• XPX4 Pharmaceuticals, Inc XFOR167,750 shares⁴$430.3K at $2.56Jun 30, 2026
• CTI BioPharma0 shares⁵Jun 26, 2023

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

Recent filings

• Jun 30, 2026Sold 8,543 shares at $4.26 of X4 Pharmaceuticals, Inc⁴
• May 12, 2026Sold 16,961 shares at $4.29 of X4 Pharmaceuticals, Inc⁶
• Aug 14, 2025Granted 193,254 shares of X4 Pharmaceuticals, Inc⁷
• Jun 26, 2023U 17,547 shares at $9.10 of CTI BioPharma⁵
• Jan 3, 2023Sold 27,021 shares at $6.01 of CTI BioPharma⁸
• Jan 3, 2023Exercised options 27,021 shares at $0.95 of CTI BioPharma⁸
• Dec 30, 2022Sold 1,047 shares at $6.01 of CTI BioPharma⁸
• Dec 30, 2022Exercised options 1,047 shares at $0.95 of CTI BioPharma⁸
• Dec 30, 2022Sold 800 shares at $6.01 of CTI BioPharma⁸
• Dec 30, 2022Exercised options 800 shares at $0.95 of CTI BioPharma⁸
• Dec 30, 2022Sold 12,000 shares at $6.00 of CTI BioPharma⁸
• Dec 30, 2022Exercised options 12,000 shares at $0.95 of CTI BioPharma⁸
• Dec 30, 2022Granted 214 shares at $5.11 of CTI BioPharma⁸
• Dec 29, 2022Sold 13,174 shares at $6.00 of CTI BioPharma⁸
• Dec 29, 2022Exercised options 13,174 shares at $0.95 of CTI BioPharma⁸
• Oct 4, 2022Sold 609 shares at $6.27 of CTI BioPharma⁹
• Oct 4, 2022Exercised options 609 shares at $0.95 of CTI BioPharma⁹
• Oct 4, 2022Sold 100 shares at $6.26 of CTI BioPharma⁹
• Oct 4, 2022Exercised options 100 shares at $0.95 of CTI BioPharma⁹
• Oct 4, 2022Sold 1,400 shares at $6.25 of CTI BioPharma⁹
• Oct 4, 2022Exercised options 1,400 shares at $0.95 of CTI BioPharma⁹
• Oct 3, 2022Sold 300 shares at $6.25 of CTI BioPharma¹⁰
• Oct 3, 2022Exercised options 300 shares at $0.95 of CTI BioPharma¹⁰
• Sep 30, 2022Sold 139,841 shares at $6.05 of CTI BioPharma¹⁰
• Sep 30, 2022Exercised options 139,841 shares at $0.95 of CTI BioPharma¹⁰