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Amphastar (AMPH) director awarded RSUs and options with tax withholding update

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Amphastar Pharmaceuticals, Inc. director Lee Howard reported routine equity compensation and related tax withholding. On June 1, 2026, he received 8,143 shares of Common Stock in the form of restricted stock units that will fully vest on June 1, 2027, and was granted stock options for 17,365 shares at an exercise price of $18.42 per share, expiring on June 1, 2036. On June 2, 2026, 769 shares of Common Stock were withheld to cover his tax liability from RSU vesting. After these transactions, he directly holds 159,350 shares of Common Stock.

Positive

  • None.

Negative

  • None.
Insider Lee Howard
Role null
Type Security Shares Price Value
Tax Withholding Common Stock 769 $18.45 $14K
Grant/Award Stock Option (right to buy) 17,365 $0.00 --
Grant/Award Common Stock 8,143 $0.00 --
Holdings After Transaction: Common Stock — 159,350 shares (Direct, null); Stock Option (right to buy) — 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. The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs. All of the shares subject to the option vest on June 1, 2027.
RSU grant 8,143 shares Restricted stock units vesting on June 1, 2027
Tax withholding shares 769 shares Shares withheld to satisfy tax liability from RSU vesting
Stock options granted 17,365 shares Options on Common Stock granted June 1, 2026
Option exercise price $18.42 per share Conversion or exercise price for stock options
Option expiration June 1, 2036 Expiration date of stock options
Shares held after transactions 159,350 shares Direct Common Stock ownership following transactions
RSU-related share price $18.45 per share Price used for 769-share tax-withholding disposition
Grant date for RSUs and options June 1, 2026 Transaction date for equity award acquisitions
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.
tax liability financial
"The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs."
Stock Option (right to buy) financial
"Stock Option (right to buy) with 17,365.0000 shares and a conversion or exercise price of 18.4200."
exercise price financial
"conversion or exercise price of 18.4200 for the Stock Option (right to buy)."
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.
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Lee Howard
(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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/01/2026A8,143(1)A$0160,119D
Common Stock06/02/2026F769(2)D$18.45159,350D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy)$18.4206/01/2026A17,365 (3)06/01/2036Common Stock17,365$017,365D
Explanation of Responses:
1. The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 1, 2027.
2. The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs.
3. All of the shares subject to the option vest on June 1, 2027.
/s/ Eva Wen, by power of attorney06/03/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Amphastar (AMPH) director Lee Howard report in this Form 4?

Lee Howard reported routine equity compensation and tax withholding. He received 8,143 restricted stock units and options for 17,365 shares, and had 769 shares withheld to cover taxes related to RSU vesting.

How many Amphastar (AMPH) shares does Lee Howard hold after these transactions?

After these transactions, Lee Howard directly holds 159,350 shares of Amphastar Common Stock. This figure reflects his updated ownership following the RSU grant and the 769 shares withheld for tax obligations.

What equity awards did Lee Howard receive from Amphastar (AMPH)?

Lee Howard received 8,143 restricted stock units that vest on June 1, 2027, and a stock option for 17,365 shares at an $18.42 exercise price, expiring June 1, 2036, as part of his compensation.

Why were 769 Amphastar (AMPH) shares disposed of in this Form 4?

The 769 shares were withheld to satisfy Lee Howard’s tax liability from the vesting of restricted stock units. This tax-withholding disposition is not an open-market sale but a standard mechanism to cover taxes on equity awards.

When do Lee Howard’s new Amphastar (AMPH) RSUs vest?

All 8,143 restricted stock units granted to Lee Howard vest on June 1, 2027. Until that date, they remain unvested awards that convert into Common Stock only upon vesting, subject to the specified terms.

What are the key terms of Lee Howard’s new Amphastar (AMPH) stock options?

The new stock options cover 17,365 shares of Amphastar Common Stock at an exercise price of $18.42 per share. All shares subject to the option vest on June 1, 2027, and the option expires on June 1, 2036.