Perspective Therapeutics, Inc. ownership disclosure: Avidity reporting group states shared beneficial ownership of 6,049,999 shares of Common Stock, representing 5.3%.
The filing also shows Avidity Private Master Fund I LP holds 5,849,999 shares ( 5.1%). The report is signed by Michael Gregory on 03/10/2026.
Positive
None.
Negative
None.
Insights
Large institutional holder discloses passive, shared voting stake near 5%.
The filing lists 6,049,999 shares ( 5.3%) as shared voting and dispositive power across Avidity entities and 5,849,999 shares ( 5.1%) for Avidity Private Master Fund I LP. The report states the securities are directly owned by advisory clients of Avidity Partners Management LP.
Ownership is reported as shared power with 0 sole voting or dispositive power recorded. The signature block is dated 03/10/2026, and reporting persons disclaim beneficial ownership except for pecuniary interest.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Perspective Therapeutics, Inc.
(Name of Issuer)
Common Stock, $0.001 par value
(Title of Class of Securities)
02/20/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Avidity Partners Management LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
6,049,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,049,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,049,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.3 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Avidity Partners Management (GP) LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
6,049,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,049,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,049,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.3 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Avidity Capital Partners Fund (GP) LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
6,049,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,049,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,049,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.3 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Avidity Capital Partners (GP) LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
6,049,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,049,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,049,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.3 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Avidity Private Master Fund I LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
CAYMAN ISLANDS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,849,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,849,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,849,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.1 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
1
Names of Reporting Persons
Michael Gregory
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
6,049,999.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,049,999.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,049,999.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.3 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Perspective Therapeutics, Inc.
(b)
Address of issuer's principal executive offices:
2401 Elliott Avenue, Suite 320, Seattle, Washington 98121
Item 2.
(a)
Name of person filing:
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
(b)
Address or principal business office or, if none, residence:
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
(c)
Citizenship:
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
(d)
Title of class of securities:
Common Stock, $0.001 par value
(e)
CUSIP No.:
46489V302
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
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
(b)
Percent of class:
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%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
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
(ii) Shared power to vote or to direct the vote:
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
(iii) Sole power to dispose or to direct the disposition of:
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
(iv) Shared power to dispose or to direct the disposition of:
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
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
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.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Please see Exhibit B attached hereto.
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
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.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Avidity Partners Management LP
Signature:
By: Avidity Partners Management (GP) LLC, its general partner, By: /s/ Michael Gregory
Name/Title:
Michael Gregory, Managing Member
Date:
03/10/2026
Avidity Partners Management (GP) LLC
Signature:
By: /s/ Michael Gregory
Name/Title:
Michael Gregory, Managing Member
Date:
03/10/2026
Avidity Capital Partners Fund (GP) LP
Signature:
By: Avidity Capital Partners (GP) LLC, its general partner, By: /s/ Michael Gregory
Name/Title:
Michael Gregory, Managing Member
Date:
03/10/2026
Avidity Capital Partners (GP) LLC
Signature:
By: /s/ Michael Gregory
Name/Title:
Michael Gregory, Managing Member
Date:
03/10/2026
Avidity Private Master Fund I LP
Signature:
By: Avidity Capital Partners Fund (GP) LP, its general partner, By: Avidity Capital Partners (GP) LLC, its general partner, By: /s/ Michael Gregory
Name/Title:
Michael Gregory, Managing Member
Date:
03/10/2026
Michael Gregory
Signature:
By: /s/ Michael Gregory
Name/Title:
Michael Gregory
Date:
03/10/2026
Comments accompanying signature: * 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.
Exhibit Information
[Exhibit A - Joint Filing Agreement]
[Exhibit B - Control Person Identification]
Avidity reports shared beneficial ownership of 6,049,999 shares, equal to 5.3% of common stock. The filing lists that amount across several Avidity entities and shows shared voting and dispositive power.
How many shares does Avidity Private Master Fund I LP hold in CATX?
Avidity Private Master Fund I LP holds 5,849,999 shares, representing 5.1% of the class. The ownership is reported with shared voting and shared dispositive power in the Schedule 13G.
Who signed the Schedule 13G for these CATX holdings?
Michael Gregory signed on behalf of the reporting entities. The signature block shows Michael Gregory as Managing Member and the date of signature is 03/10/2026.
Do the Avidity filers claim sole voting or dispositive power?
No. The filing reports 0 shares with sole voting or sole dispositive power; the listed amounts are reported as shared voting and shared dispositive power across the Avidity entities.
Are these shares directly owned or held for advisory clients?
The filing states the securities are directly owned by advisory clients of Avidity Partners Management LP. It also notes that, except for Avidity Private Master Fund I LP, no advisory client is deemed to beneficially own more than 5%.
