Emergent BioSolutions officer sells 3,000 shares

Emergent BioSolutions Inc. reported that Paul Anthony Williams, SVP, Products Business, sold 3,000 shares of common stock on October 1, 2026, at a weighted average price of $6.53 per share; the individual sale prices ranged from $6.52 to $6.56.

Rhea-AI Filing Summary

Emergent BioSolutions Inc. reported that Paul Anthony Williams, SVP, Products Business, sold 3,000 shares of common stock on October 1, 2026, at a weighted average price of $6.53 per share; the individual sale prices ranged from $6.52 to $6.56. The sale was made under a Rule 10b5-1(c) trading plan adopted November 14, 2025. Williams directly held 156,098 shares after the sale.

Insider Trade Summary 10b5-1

Net Seller: 3,000 shares

Net Sell 1 txn

Insider Williams Paul Anthony

Role SVP, Products Business

Sold 3,000 shs ($20K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	3,000	$6.53	$20K

Holdings After Transaction: Common Stock — 156,098 shares (Direct)

Footnotes (2)

1. F1. All transactions listed on this Form 4 were made by the Reporting Person pursuant to a trading plan adopted on November 14, 2025 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.
2. F2. The price reported in Column 4 is a weighted average price for sales executed on the same day within a one-dollar price range. These shares were sold in multiple transactions at prices ranging from $6.52 to $6.56, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Key Figures

Shares Sold: 3,000 shares Weighted Average Sale Price: $6.53 per share Sale Price Range: $6.52–$6.56 per share +2 more

5 metrics

Shares Sold 3,000 shares Common stock sold on October 1, 2026

Weighted Average Sale Price $6.53 per share Sales on October 1, 2026

Sale Price Range $6.52–$6.56 per share Individual sale prices on October 1, 2026

Direct Shares Held After Sale 156,098 shares Paul Anthony Williams's reported direct holdings after the transaction

Trading Plan Adoption Date November 14, 2025 Rule 10b5-1(c) trading plan

Key Terms

Rule 10b5-1(c), weighted average price, trading plan

3 terms

Rule 10b5-1(c) regulatory

"intended to comply with Rule 10b5-1(c)"

Rule 10b5-1(c) is an SEC guideline that lets company insiders set up a written, pre-planned schedule to buy or sell their company stock when they are not in possession of material, nonpublic information. For investors, it matters because such plans can reduce the appearance of insider trading by separating decisions from inside knowledge—like putting your trades on autopilot—while also requiring scrutiny since pre-planned trades can still affect market confidence and share value.

weighted average price financial

"a weighted average price for sales executed on the same day"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

trading plan regulatory

"pursuant to a trading plan adopted on November 14, 2025"

A trading plan is a written set of rules an investor follows about what to buy or sell, when to enter and exit positions, and how much risk to accept—like a travel itinerary that maps the route, stops, and budget before a trip. It matters because it helps remove emotional decisions during market swings, enforces discipline, and makes performance easier to review and improve, reducing the chance of costly impulsive moves.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many EBS shares did Paul Anthony Williams sell, and at what price?

Paul Anthony Williams sold 3,000 shares of Emergent BioSolutions common stock on October 1, 2026, at a weighted average price of $6.53 per share. Individual sale prices ranged from $6.52 to $6.56, inclusive. The transactions were made under a Rule 10b5-1(c) trading plan adopted November 14, 2025.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 09:16 AM Accepted by SEC EDGAR 10/05/2026 - 09:16 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Williams Paul Anthony

(Last) (First) (Middle)

300 PROFESSIONAL DRIVE

(Street)

GAITHERSBURG MARYLAND 20879

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Emergent BioSolutions Inc. [ EBS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Products Business

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2026		S		3,000(1)	D	$6.53(2)	156,098	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. All transactions listed on this Form 4 were made by the Reporting Person pursuant to a trading plan adopted on November 14, 2025 that is intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.

2. The price reported in Column 4 is a weighted average price for sales executed on the same day within a one-dollar price range. These shares were sold in multiple transactions at prices ranging from $6.52 to $6.56, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

Remarks:

	/s/ Richard S. Lindahl, Attorney-in-fact	10/02/2026
	** 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 4 (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.
* Form 4: SEC 1474 (03-26)