Amphastar insider plans 47,101-share stock sale

Amphastar Pharmaceuticals, Inc. (symbol AMPH) has a notice of proposed sale under Rule 144 for its common stock.

Rhea-AI Filing Summary

Amphastar Pharmaceuticals, Inc. (symbol AMPH) has a notice of proposed sale under Rule 144 for its common stock. Floyd Petersen plans to sell 47,101 shares of Amphastar common stock through UBS Financial Services Inc., with an indicated aggregate market value of 989,121. Amphastar reports that 44,092,000 shares of this class of common stock are outstanding. The shares to be sold were acquired from the issuer via an option exercise for cash, with the form listing 08/18/2026 as both the acquisition and proposed sale date, and identifying NASDAQ as the exchange.

Key Figures

Shares to be sold: 47,101 shares Aggregate market value: 989,121 Shares outstanding: 44,092,000 shares +1 more

4 metrics

Shares to be sold 47,101 shares Number of Amphastar common shares proposed to be sold under Rule 144

Aggregate market value 989,121 Aggregate market value of the 47,101 shares to be sold

Shares outstanding 44,092,000 shares Total Amphastar common shares outstanding for this class

Proposed sale date 08/18/2026 Approximate date of sale listed for the Rule 144 transaction

Key Terms

Rule 144, aggregate market value, attorney-in-fact

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of 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.

aggregate market value financial

"Common Stock | UBS Financial Services Inc ... | 47101 | 989121 | 44092000"

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.

attorney-in-fact regulatory

"for UBS Financial Services Inc, as attorney-in-fact for Floyd Petersen"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What does the Form 144 filing for AMPH disclose about planned share sales?

The Form 144 discloses a proposed sale of 47,101 shares of Amphastar Pharmaceuticals, Inc. common stock. The shares are to be sold under Rule 144 through UBS Financial Services Inc. and were acquired via an option exercise for cash.

How many AMPH shares are planned to be sold and what is their aggregate market value?

The filing lists a planned sale of 47,101 shares of Amphastar common stock with an aggregate market value of 989,121. These figures relate specifically to this proposed Rule 144 transaction reported for the selling security holder.

Who is the selling security holder in the AMPH Form 144 notice?

The selling security holder named is Floyd Petersen. UBS Financial Services Inc. is identified as the broker, and the form is signed by Mijo Suric for UBS as attorney-in-fact for Floyd Petersen in connection with this planned Rule 144 sale.

What does the AMPH Form 144 say about total shares outstanding?

The notice states that 44,092,000 shares of Amphastar Pharmaceuticals, Inc. common stock are outstanding. This figure provides context for the size of the 47,101-share proposed sale relative to the total outstanding shares of the same class.

How and when were the AMPH shares in this Form 144 acquired?

The shares covered by this Form 144 were acquired from the issuer through an option exercise for cash. The form lists 08/18/2026 as the relevant date for both the option exercise and the proposed sale, tying acquisition and sale to the same day.

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

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Available on EDGAR 08/18/2026 - 05:57 PM Accepted by SEC EDGAR 08/18/2026 - 05:56 PM 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	0001611286
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 SIXTH STREET Rancho Cucamonga CALIFORNIA 91730
Phone	909-980-9484
Name of Person for Whose Account the Securities are To Be Sold	Floyd Petersen
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	47101	989121	44092000	08/18/2026	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	08/18/2026	Option Exercise	Issuer			47101	08/18/2026	Cash

* 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	08/18/2026
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 Floyd Petersen
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)