Amphastar (AMPH) director receives RSU and stock option grants

Rhea-AI Filing Summary

Amphastar Pharmaceuticals director Michael A. Zasloff received new equity awards in the form of stock and options. On June 1, 2026, he was granted 8,143 shares of common stock represented by restricted stock units that vest on June 1, 2027. He also received a stock option for 17,365 shares of common stock at an exercise price of $18.42 per share, expiring on June 1, 2036, with all option shares vesting on June 1, 2027. Following these grants, he directly owns 37,667 shares of Amphastar common stock. These awards represent compensation rather than open-market purchases or sales.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider ZASLOFF MICHAEL A

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	17,365	$0.00	--
Grant/Award	Common Stock	8,143	$0.00	--

Holdings After Transaction: Common Stock — 17,365 shares (Direct, null)

Footnotes (1)

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

Key Figures

RSU grant: 8,143 shares Option grant size: 17,365 shares Option exercise price: $18.42 per share +3 more

6 metrics

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

Option grant size 17,365 shares 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 for the stock options

Shares after grant 37,667 shares Common stock directly owned after non-derivative grant

RSU vesting date June 1, 2027 All 8,143 RSU shares vest on this date

Key Terms

restricted stock units, RSUs, stock option, exercise price, +1 more

5 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.

RSUs financial

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

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

stock option financial

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

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

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.

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Form 4 Insider Transactions: What Each Field Means →

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^*

ZASLOFF MICHAEL A

(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	37,667	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
Common Stock	$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)

FAQ

What insider transaction did Amphastar (AMPH) director Michael Zasloff report?

Michael A. Zasloff reported receiving equity compensation rather than trading shares on the market. He was granted restricted stock units and stock options in Amphastar Pharmaceuticals, increasing his direct ownership stake without any open-market buying or selling activity.

How many Amphastar (AMPH) RSUs were granted to Michael Zasloff and when do they vest?

He received 8,143 shares represented by restricted stock units. All of these RSUs vest on June 1, 2027, meaning the shares are delivered then if conditions are met, aligning the director’s incentives with Amphastar’s longer-term performance.

What are the terms of Michael Zasloff’s new Amphastar (AMPH) stock options?

He was granted options covering 17,365 shares of Amphastar common stock at an exercise price of $18.42 per share. All option shares vest on June 1, 2027, and the options expire on June 1, 2036 if not exercised.

Did Michael Zasloff buy or sell Amphastar (AMPH) shares on the open market?

No open-market trades were reported. The Form 4 shows grant or award acquisitions of restricted stock units and stock options as compensation, with a reported price per share of $0.00 for these awards, not purchases or sales.

What is Michael Zasloff’s Amphastar (AMPH) shareholding after the reported grants?

After the non-derivative stock grant, Michael A. Zasloff directly holds 37,667 shares of Amphastar common stock. This figure reflects his direct ownership position following the June 1, 2026 equity compensation awards disclosed in the Form 4 filing.

When do Michael Zasloff’s new Amphastar (AMPH) equity awards fully vest?

Both the restricted stock units and the stock options vest on June 1, 2027. This single vesting date applies to all 8,143 RSU shares and the 17,365 option shares, encouraging longer-term alignment with Amphastar’s performance until that vesting milestone.