AMPH plans Rule 144 sale of common stock

AMPH filed a notice of a proposed sale of common stock under Rule 144.

Rhea-AI Filing Summary

AMPH filed a notice of a proposed sale of common stock under Rule 144. The filing lists UBS Financial Services Inc as broker for a transaction involving 7,973 shares of common stock with an aggregate market value of $161,931.63, referencing 44,009,000 shares outstanding and a proposed sale date of 08/11/2026 on NASDAQ. The shares derive from multiple RSU vesting events between 2017 and 2025, including grants that vested in 2017, 2018, 2019, 2020, 2024, and 2025.

Key Figures

Shares in proposed Rule 144 sale: 7,973 shares Aggregate market value of shares: $161,931.63 Shares outstanding: 44,009,000 shares +4 more

7 metrics

Shares in proposed Rule 144 sale 7,973 shares Common stock to be sold through UBS Financial Services Inc

Aggregate market value of shares $161,931.63 Value associated with the 7,973 common shares in the proposed sale

Shares outstanding 44,009,000 shares Common shares outstanding referenced in the Rule 144 notice

Proposed sale date 08/11/2026 Date associated with the planned Rule 144 common stock sale

RSU vesting 06/05/2024 216 shares Common stock from RSU vesting on 06/05/2024 listed as a source

RSU vesting 06/03/2025 1,567 shares Common stock from RSU vesting on 06/03/2025 listed as a source

Largest single RSU vesting listed 2,295 shares Common stock from RSU vesting on 06/07/2019

Key Terms

Rule 144, RSU Vesting, aggregate market value, shares outstanding

4 terms

Rule 144 regulatory

"filed a notice of a proposed sale of common stock under Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

RSU Vesting financial

"Common Stock | 06/05/2024 | RSU Vesting | Issuer"

RSU vesting is the process by which restricted stock units — a promise by a company to give shares to an employee — become actual, owned shares over time or when certain goals are met. Investors care because vested shares can dilute existing ownership when issued, and the timing of vesting affects when employees can sell shares, which can influence share supply, insider selling patterns, and company incentives.

aggregate market value financial

"transaction involving 7,973 shares of common stock with an aggregate market value of $161,931.63"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

shares outstanding financial

"referencing 44,009,000 shares outstanding and a proposed sale date"

Shares outstanding are the total number of a company’s stock units held by all shareholders, including institutional investors and company insiders — think of them as the total number of slices of the company’s ownership pie. Investors use this number to calculate how much of the company each share represents, and it directly affects per-share measures like earnings per share, ownership percentage and valuation; when the slice count changes, an investor’s claim and the company’s per-share metrics change too.

FAQ

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

What does the AMPH Rule 144 filing disclose about planned stock sales?

The filing discloses a proposed Rule 144 sale of 7,973 common shares of AMPH through UBS Financial Services Inc, with an aggregate market value of $161,931.63 and a referenced proposed sale date of 08/11/2026 on NASDAQ.

How many AMPH shares are referenced as outstanding in this Rule 144 notice?

The notice references 44,009,000 shares of AMPH common stock as outstanding in connection with the planned Rule 144 sale. This figure serves as context for the relative size of the proposed transaction compared with total shares outstanding.

Which broker is handling the AMPH Rule 144 common stock sale?

The broker listed for the AMPH Rule 144 sale is UBS Financial Services Inc, located at 1000 Harbor Blvd, 3rd Floor, Weehawken, NJ 07086. UBS is identified as the firm through which the proposed common stock sale will be executed.

What RSU vesting events support the AMPH shares included in the Rule 144 filing?

The shares come from multiple RSU vesting events dated 06/09/2017, 06/08/2018, 06/07/2019, 06/12/2020, 06/07/2020, 06/05/2024, and 06/03/2025. Each event involved vested common shares issued by the company, which are now eligible for resale under Rule 144.

How many AMPH RSU shares vested in recent years according to this filing?

Recent RSU vestings include 216 shares on 06/05/2024 and 1,567 shares on 06/03/2025. Earlier RSU vestings of 2,295, 1,395, 295, 271, and 1,934 shares between 2017 and 2020 are also listed as sources.

What time frame does the AMPH Form 144 cover for potential stock sales?

The filing lists a proposed sale date of 08/11/2026 for the common stock transaction under Rule 144. Rule 144 notices typically cover sales within a limited forward window, and this date anchors when the filer expects to execute the planned sale.

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

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Available on EDGAR 08/11/2026 - 11:54 AM Accepted by SEC EDGAR 08/11/2026 - 11:53 AM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001047579
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Amphastar Pharmaceuticals, Inc.
SEC File Number	001-36509
Address of Issuer	11570 6th Street Rancho Cucamonga CALIFORNIA 91730
Phone	909-980-9484
Name of Person for Whose Account the Securities are To Be Sold	Richard Prins
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	7973	161931.63	44009000	08/11/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	06/05/2024	RSU Vesting	Issuer			216	06/05/2024	N/A
Common Stock	06/03/2025	RSU Vesting	Issuer			1567	06/03/2025	N/A
Common Stock	06/07/2019	RSU Vesting	Issuer			2295	06/07/2019	N/A
Common Stock	06/12/2020	RSU Vesting	Issuer			1395	06/12/2020	N/A
Common Stock	06/07/2020	RSU Vesting	Issuer			295	06/07/2020	N/A
Common Stock	06/09/2017	RSU Vesting	Issuer			271	06/09/2017	N/A
Common Stock	06/08/2018	RSU Vesting	Issuer			1934	06/08/2018	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Richard Prins
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)