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Form SCHEDULE 13G Altimmune, Inc. Filed by: VIKING GLOBAL INVESTORS LP

May 1, 2026 5:39 PM





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)




schemaVersion:


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G




Comment for Type of Reporting Person: See Item 4


SCHEDULE 13G



VIKING GLOBAL INVESTORS LP
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of VIKING GLOBAL INVESTORS LP (1)(2)
Date:05/01/2026
Viking Global Opportunities Parent GP LLC
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Parent GP LLC (1)(2)
Date:05/01/2026
Viking Global Opportunities GP LLC
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities GP LLC (1)(2)
Date:05/01/2026
Viking Global Opportunities Portfolio GP LLC
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Portfolio GP LLC (1)(2)
Date:05/01/2026
Viking Global Opportunities Illiquid Investments Sub-Master LP
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Illiquid Investments Sub-Master LP (1)(2)
Date:05/01/2026
Viking Global Opportunities Vintage IV GP LLC
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Vintage IV GP LLC (1)(2)
Date:05/01/2026
Viking Global Opportunities Vintage IV Portfolio GP LLC
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Vintage IV Portfolio GP LLC (1)(2)
Date:05/01/2026
Viking Global Opportunities Vintage IV (Aggregator) LP
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Viking Global Opportunities Vintage IV (Aggregator) LP (1)(2)
Date:05/01/2026
HALVORSEN OLE ANDREAS
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of O. Andreas Halvorsen (1)
Date:05/01/2026
Shabet Rose Sharon
Signature:/s/ Scott M. Hendler
Name/Title:Scott M. Hendler on behalf of Rose S. Shabet (2)
Date:05/01/2026

Comments accompanying signature: (1) Scott M. Hendler is signing on behalf of O. Andreas Halvorsen, individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES PARENT GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES GP LLC, VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC, VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP, VIKING GLOBAL OPPORTUNITIES VINTAGE IV GP LLC, VIKING GLOBAL OPPORTUNITIES VINTAGE IV PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES VINTAGE IV (AGGREGATOR) LP, pursuant to an authorization and designation letter dated February 9, 2021, which was previously filed with the Commission as an exhibit to a Form 13G filed by Mr. Halvorsen on February 12, 2021 (SEC File No. 005-49737). (2) Scott M. Hendler is signing on behalf of Rose S. Shabet, individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES PARENT GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES GP LLC, VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC, VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP, VIKING GLOBAL OPPORTUNITIES VINTAGE IV GP LLC, VIKING GLOBAL OPPORTUNITIES VINTAGE IV PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES VINTAGE IV (AGGREGATOR) LP, pursuant to an authorization and designation letter dated February 9, 2021, which was previously filed with the Commission as an exhibit to a Form 13G filed by Mr. Halvorsen on February 12, 2021 (SEC File No. 005-49737).
Exhibit Information

EXHIBIT A - JOINT FILING AGREEMENT

ATTACHMENTS / EXHIBITS

JFA

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