Amphastar director receives RSU and option grants

Amphastar Pharmaceuticals director Deflin Gayle received new equity compensation awards.

Rhea-AI Filing Summary

Amphastar Pharmaceuticals director Deflin Gayle received new equity compensation awards. On June 1, 2026, Gayle acquired 8,143 shares of Common Stock through restricted stock units that vest on June 1, 2027. Gayle also received stock options for 17,365 shares at an exercise price of $18.42 per share, with all option shares vesting on June 1, 2027 and expiring on June 1, 2036. Following the stock grant, Gayle directly holds 19,057 shares of Common Stock, in addition to the newly granted options. These are compensation-related awards rather than open-market purchases or sales.

Insider Trade Summary

Grant/Award: 25,508 shares

Grant/Award 2 txns

Insider Deflin Gayle

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	17,365	$0.00	$0.00
Grant/Award	Common Stock	8,143	$0.00	$0.00

Holdings After Transaction: Stock Option (right to buy) — 17,365 contracts (Direct); Common Stock — 19,057 shares (Direct)

Footnotes (2)

1. F1. The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 1, 2027.
2. F2. All of the shares subject to the option vest on June 1, 2027.

Key Figures

RSU grant size: 8,143 shares Option grant size: 17,365 options Option exercise price: $18.42 per share +2 more

5 metrics

RSU grant size 8,143 shares Restricted stock units vesting June 1, 2027

Option grant size 17,365 options Stock options on Common Stock granted June 1, 2026

Option exercise price $18.42 per share Exercise price for 17,365 stock options

Option expiration June 1, 2036 Expiration date of stock options

Shares held after grant 19,057 shares Common Stock directly held after June 1, 2026 RSU grant

Key Terms

restricted stock units, stock options, exercise price, expiration date

4 terms

restricted stock units financial

"The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 1, 2027."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

stock options financial

"All of the shares subject to the option vest on June 1, 2027."

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

exercise price financial

"conversion_or_exercise_price: "18.4200""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

expiration date financial

"expiration_date: "2036-06-01T00:00:00.000Z""

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

FAQ

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

What equity awards did Deflin Gayle receive from Amphastar (AMPH)?

Deflin Gayle received 8,143 restricted stock units and stock options for 17,365 shares of Amphastar Common Stock. The awards are compensation grants, not open-market transactions, and provide both current share exposure and future purchase rights at a fixed exercise price.

When do Deflin Gayle’s new Amphastar (AMPH) RSUs and options vest?

All of Deflin Gayle’s newly granted RSUs and stock options vest on June 1, 2027. Vesting means the awards become fully owned or exercisable at that date, tying director compensation to Amphastar’s long-term performance over the next several years.

What is the exercise price and expiration date of Deflin Gayle’s Amphastar options?

Deflin Gayle’s stock options allow purchase of 17,365 Amphastar shares at $18.42 per share and expire on June 1, 2036. These long-dated options provide potential upside if the stock trades above the exercise price before expiration.

How many Amphastar (AMPH) shares does Deflin Gayle hold after these grants?

After the June 1, 2026 grant, Deflin Gayle directly holds 19,057 shares of Amphastar Common Stock. This figure reflects his non-derivative holdings and is separate from the 17,365 stock options that were also granted as part of his compensation.

Are Deflin Gayle’s recent Amphastar (AMPH) transactions open-market buys or sells?

The transactions are compensation-related grants, not open-market buys or sells. Gayle acquired 8,143 RSUs and 17,365 stock options at no cash cost, reflecting board compensation rather than discretionary trading in Amphastar shares.

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

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Accepted by SEC EDGAR 06/03/2026 - 08:29 PM EDT 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).

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^*

Deflin Gayle

(Last) (First) (Middle)

C/O AMPHASTAR PHARMACEUTICALS, INC.

11570 6TH STREET

(Street)

RANCHO CUCAMONGA CALIFORNIA 91730

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Amphastar Pharmaceuticals, Inc. [ AMPH ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

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	06/01/2026		A		8,143(1)	A	$0	19,057	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
Stock Option (right to buy)	$18.42	06/01/2026		A		17,365		(2)	06/01/2036	Common Stock	17,365	$0	17,365	D

Explanation of Responses:

1. The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 1, 2027.

2. All of the shares subject to the option vest on June 1, 2027.

	/s/ Eva Wen, by power of attorney	06/03/2026
	** 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)