SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response: 0.5

1. Name and Address of Reporting Person* Duatschek Stephanie (Last) (First) (Middle) 300 PROFESSIONAL DRIVE (Street) GAITHERSBURG MD 20879 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 08/05/2026	3. Issuer Name and Ticker or Trading Symbol Emergent BioSolutions Inc. [ EBS ] Foreign Trading Symbol
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner Officer (give title below) Other (specify below) EVP, CGO	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	197,416(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (Right to buy)	(2)	07/08/2028	Common Stock	6,772	59.07	D
Employee Stock Option (Right to buy) (Common Stock)	(3)	02/28/2029	Common Stock	7,250	41.38	D
Employee Stock Option (Right to buy) (Common Stock)	(4)	03/05/2030	Common Stock	2,308	11.66	D
Employee Stock Option (Right to buy) (Common Stock)	(5)	06/08/2030	Common Stock	9,231	8.39	D
Employee Stock Option (Right to buy) (Common Stock)	(6)	03/12/2031	Common Stock	125,000	2.33	D
Employee Stock Option (Right to buy) (Common Stock)	(7)	03/05/2032	Common Stock	62,500	5.8	D
Employee Stock Option (Right to buy) (Common Stock)	(8)	03/02/2033	Common Stock	44,834	8.99	D

Explanation of Responses:

1. Consists of 55,639 shares of common stock and 141,777 unvested RSUs from the Emergent Stock Incentive Plan. Each RSU represents a right to receive one share of common stock. The RSUs vest in three equal installments annually on the day prior to the anniversary date of the grant.

2. Granted on July 9, 2021 and as of the date of this filing all of the shares underlying the option are vested and exercisable.

3. Granted on March 1, 2022 and as of the date of this filing all of the shares underlying the option are vested and exercisable.

4. Granted on March 6, 2023 and as of the date of this filing all of the shares underlying the option are vested and exercisable.

5. Granted on June 9, 2023 and as of the date of this filing all of the shares underlying the option are vested and exercisable.

6. Granted on March 13, 2024 and vests in three installments beginning on the day prior to the anniversary date of the grant. As of the date of this filing, 83,250 of the shares underlying the option are vested and exercisable.

7. Granted on March 6, 2025 and vests in three installments beginning on the day prior to the anniversary date of the grant. As of the date of this filing, 20,813 of the shares underlying the option are vested and exercisable.

8. Granted on March 3, 2026 and vests in three installments beginning on the day prior to the anniversary date of the grant.

Remarks:

Exhibit list: Ex 24.1 - Power of Attorney

	/s/ Richard S. Lindahl, Attorney-in-fact	08/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.