Michael Gregory, Managing Member

SCHEDULE 13G 0001791827 XXXXXXXX LIVE Common Stock, $0.001 par value 02/20/2026 0000728387 Perspective Therapeutics, Inc. 46489V302 2401 Elliott Avenue Suite 320 Seattle WA 98121 Rule 13d-1(c) Avidity Partners Management LP b DE 0.00 6049999.00 0.00 6049999.00 6049999.00 N 5.3 IA PN Avidity Partners Management (GP) LLC b DE 0.00 6049999.00 0.00 6049999.00 6049999.00 N 5.3 OO Avidity Capital Partners Fund (GP) LP b DE 0.00 6049999.00 0.00 6049999.00 6049999.00 N 5.3 PN Avidity Capital Partners (GP) LLC b DE 0.00 6049999.00 0.00 6049999.00 6049999.00 N 5.3 OO Avidity Private Master Fund I LP b E9 0.00 5849999.00 0.00 5849999.00 5849999.00 N 5.1 PN Michael Gregory b X1 0.00 6049999.00 0.00 6049999.00 6049999.00 N 5.3 HC IN Perspective Therapeutics, Inc. 2401 Elliott Avenue, Suite 320, Seattle, Washington 98121 Avidity Partners Management LP Avidity Partners Management (GP) LLC Avidity Capital Partners Fund (GP) LP Avidity Capital Partners (GP) LLC Avidity Private Master Fund I LP Michael Gregory Avidity Partners Management LP 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Avidity Partners Management (GP) LLC 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Avidity Capital Partners Fund (GP) LP 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Avidity Capital Partners (GP) LLC 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Avidity Private Master Fund I LP 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Michael Gregory c/o Avidity Partners Management LP 2828 N Harwood Street, Suite 1220 Dallas, Texas 75201 United States of America Avidity Partners Management LP - Delaware Avidity Partners Management (GP) LLC - Delaware Avidity Capital Partners Fund (GP) LP - Delaware Avidity Capital Partners (GP) LLC - Delaware Avidity Private Master Fund I LP - Cayman Islands Michael Gregory - United States Y Avidity Partners Management LP - 6,049,999 Avidity Partners Management (GP) LLC - 6,049,999 Avidity Capital Partners Fund (GP) LP - 6,049,999 Avidity Capital Partners (GP) LLC - 6,049,999 Avidity Private Master Fund I LP -5,849,999 Michael Gregory - 6,049,999 Avidity Partners Management LP - 5.3% Avidity Partners Management (GP) LLC - 5.3% Avidity Capital Partners Fund (GP) LP - 5.3% Avidity Capital Partners (GP) LLC - 5.3% Avidity Private Master Fund I LP - 5.1% Michael Gregory - 5.3% Avidity Partners Management LP - 0 Avidity Partners Management (GP) LLC - 0 Avidity Capital Partners Fund (GP) LP - 0 Avidity Capital Partners (GP) LLC - 0 Avidity Private Master Fund I LP - 0 Michael Gregory - 0 Avidity Partners Management LP - 6,049,999 Avidity Partners Management (GP) LLC - 6,049,999 Avidity Capital Partners Fund (GP) LP - 6,049,999 Avidity Capital Partners (GP) LLC - 6,049,999 Avidity Private Master Fund I LP - 5,849,999 Michael Gregory - 6,049,999 Avidity Partners Management LP - 0 Avidity Partners Management (GP) LLC - 0 Avidity Capital Partners Fund (GP) LP - 0 Avidity Capital Partners (GP) LLC - 0 Avidity Private Master Fund I LP - 0 Michael Gregory - 0 Avidity Partners Management LP - 6,049,999 Avidity Partners Management (GP) LLC - 6,049,999 Avidity Capital Partners Fund (GP) LP - 6,049,999 Avidity Capital Partners (GP) LLC - 6,049,999 Avidity Private Master Fund I LP - 5,849,999 Michael Gregory - 6,049,999 Y N All of the securities reported in this Schedule 13G are directly owned by advisory clients of Avidity Partners Management LP. None of those advisory clients, other than Avidity Private Master Fund I LP, may be deemed to beneficially own more than 5% of the Common Stock, $0.001 par value. N Please see Exhibit B attached hereto. Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. [Exhibit A - Joint Filing Agreement] [Exhibit B - Control Person Identification] Avidity Partners Management LP By: Avidity Partners Management (GP) LLC, its general partner, By: /s/ Michael Gregory Michael Gregory, Managing Member 03/10/2026 Avidity Partners Management (GP) LLC By: /s/ Michael Gregory Michael Gregory, Managing Member 03/10/2026 Avidity Capital Partners Fund (GP) LP By: Avidity Capital Partners (GP) LLC, its general partner, By: /s/ Michael Gregory Michael Gregory, Managing Member 03/10/2026 Avidity Capital Partners (GP) LLC By: /s/ Michael Gregory Michael Gregory, Managing Member 03/10/2026 Avidity Private Master Fund I LP By: Avidity Capital Partners Fund (GP) LP, its general partner, By: Avidity Capital Partners (GP) LLC, its general partner, By: /s/ Michael Gregory Michael Gregory, Managing Member 03/10/2026 Michael Gregory By: /s/ Michael Gregory Michael Gregory 03/10/2026 * Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.