Ameriprise Financial (AMP) SC 13G Altimmune / AMERIPRISE FINANCIAL ownership change

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities and Exchange Act of 1934

Altimmune, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

02155H200

(CUSIP Number)

December 31, 2023

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

This Schedule is filed pursuant to Rule 13d-1(b)

The information required in the remainder of this cover page (except any items to which the form provides a cross-reference) shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act.

CUSIP NO. 02155H200

1)	Name of Reporting Person  Ameriprise Financial, Inc.  S.S. or I.R.S. Identification No. of Above Person  IRS No. 13-3180631
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
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
	6)	Shared Voting Power  4,183,439
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,183,682

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,183,682
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.79%
12)	Type of Reporting Person  HC

CUSIP NO. 02155H200

1)	Name of Reporting Person  TAM UK International Holdings Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  Threadneedle Holdings Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  TAM UK Holdings Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  Threadneedle Asset Management Holdings Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  TC Financing Ltd
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  Threadneedle Asset Management Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

CUSIP NO. 02155H200

1)	Name of Reporting Person  Threadneedle Investment Services Limited
2)	Check the Appropriate Box if a Member of a Group  (a) ☐  (b) ☒* *   This filing describes the reporting person’s relationship with other persons, but the reporting person does not affirm the existence of a group.
3)	SEC Use Only
4)	Citizenship or Place of Organization  England and Wales

NUMBER OF SHARES BENEFICIALLY  OWNED BY EACH REPORTING PERSON WITH	5)	Sole Voting Power  0
	6)	Shared Voting Power  4,013,211
	7)	Sole Dispositive Power  0
	8)	Shared Dispositive Power  4,013,211

9)	Aggregate Amount Beneficially Owned by Each Reporting Person  4,013,211
10)	Check if the Aggregate Amount in Row (9) Excludes Certain Shares  Not Applicable
11)	Percent of Class Represented by Amount In Row (9)  7.47%
12)	Type of Reporting Person  FI

1(a)	Name of Issuer:	Altimmune, Inc.
1(b)	Address of Issuer’s Principal	910 Clopper Road, Suite 201S
	Executive Offices:	Gaithersburg, Maryland 20878
2(a)	Name of Person Filing:	(a) Ameriprise Financial, Inc. (“AFI”)
		(b) TAM UK International Holdings Limited (“TAMUKI”)
		(c) Threadneedle Holdings Limited (“THL”)
		(d) TAM UK Holdings Limited (“TUHL”)
		(e) Threadneedle Asset Management Holdings Limited (“TAMHL”)
		(f) TC Financing Ltd (“TCFL”)
		(g) Threadneedle Asset Management Limited (“TAML”)
		(h) Threadneedle Investment Services Limited (“TISL”)
		Persons (a) through (h) are sometimes referred to herein as the “Ameriprise Entities”.
2(b)	Address of Principal Business Office:	(a) Ameriprise Financial, Inc. 145 Ameriprise Financial Center Minneapolis, MN 55474
		(b) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(c) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(d) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(e) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(f) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(g) Cannon Place, 78 Cannon Street, London, EC4N 6AG
		(h) Cannon Place, 78 Cannon Street, London, EC4N 6AG
2(c)	Citizenship:	(a) Delaware
		(b) England and Wales
		(c) England and Wales
		(d) England and Wales
		(e) England and Wales
		(f) England and Wales
		(g) England and Wales
		(h) England and Wales

2(d)	Title of Class of Securities:	Common Stock
2(e)	Cusip Number:	02155H200

3 Information if statement is filed pursuant to Rules 13d-1(b) or 13d-2(b):

(a) Ameriprise Financial, Inc.

A parent holding company in accordance with Rule 13d-1(b)(1)(ii)(G). (Note: See Item 7)

(b) TAM UK International Holdings Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(c) Threadneedle Holdings Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(d) TAM UK Holdings Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(e) Threadneedle Asset Management Holdings Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(f) TC Financing Ltd

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(g) Threadneedle Asset Management Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

(h) Threadneedle Investment Services Limited

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J).

4 Incorporated by reference to Items (5)-(9) and (11) of the cover page pertaining to each reporting person.

AFI, as the parent company of the other Ameriprise Entities, may be deemed to beneficially own the shares reported herein by those reporting persons. Accordingly, the shares reported herein by AFI include those shares separately reported herein by those reporting persons.

Each of the Ameriprise Entities disclaims beneficial ownership of any shares reported on this Schedule.

5 Ownership of 5% or Less of a Class: Not Applicable

6 Ownership of more than 5% on Behalf of Another Person: Not Applicable

7 Identification and Classification of the Subsidiaries Which Acquired the Security Being Reported on by the Parent Holding Company:

AFI: See Exhibit I

8 Identification and Classification of Members of the Group:

Not Applicable

9 Notice of Dissolution of Group:

Not Applicable

10 Certification:

By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect.

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.

Dated: February 14, 2024

Ameriprise Financial, Inc.
	By: /s/ Michael G. Clarke
	Name: Michael G. Clarke
	Title: Senior Vice President, North America Head of Operations & Investor Services
TAM UK International Holdings Limited
Threadneedle Holdings Limited
TAM UK Holdings Limited
Threadneedle Asset Management Holdings Limited
TC Financing Ltd
Threadneedle Asset Management Limited
Threadneedle Investment Services Limited
By	Columbia Management Investment
	Advisers, LLC, as Attorney in Fact
	By: /s/ Michael G. Clarke
	Name: Michael G. Clarke
	Title: Senior Vice President, North America Head of Operations & Investor Services
	By Columbia Management Investment
	Advisers, LLC, as Attorney in Fact
Contact Information
Dominic Geddes
Global Head of Reporting
Global Operations and Investor Services
Telephone: +442074645779

Exhibit Index

Exhibit I	Identification and Classification of the Subsidiaries which Acquired the Security Being Reported on by the Parent Holding Company.
Exhibit II	Joint Filing Agreement
Exhibit III	Powers of Attorney