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CFO exercised or converted 5,053 AMPH derivative securities | OQRO

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Insider trades
Amphstar Pharmaceuticals, Inc.
CFO exercised or converted 5,053 AMPH derivative securities

Insider trades

Insider trade

CFO exercised or converted 5,053 AMPH derivative securities

Traded Aug 7, 2026 · Filed Aug 11, 2026

AMPAmphstar Pharmaceuticals, Inc.AMPH

5,053
Derivative units

Why it stands out

Derivative exercise or conversion — not an open-market buy.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Aug 7, 2026
Reporting period: Not applicable
Filed with the SEC: Aug 11, 2026

CFOOption exercise

Context

Classification

option exercise

Code M — exercise or conversion of a derivative security

Planned / mechanical clue

Footnote references vesting of compensation awards

Only flagged when a footnote says so; never inferred

Source receipt

Record ID: 0001263136-26-000012

Ask Claude or ChatGPT about these filings. Connect OQRO in a minute, then ask things like “which insiders bought this week?”

Filed / recorded

Aug 11, 2026, 8:57 PM UTC

Added to OQRO

Oct 6, 2026, 9:54 PM UTC

Parser

form4-xml-v2

Data quality

Verified: identifiers matched exactly

Issuer

Amphastar Pharmaceuticals, Inc.

Issuer CIK

1297184

Ticker

AMPH

Reporting person

William J Peters

Relationship

Director, Officer

Officer title

CFO, EVP & TREASURER

Security

Employee Stock Option (right to buy)

Table

Derivative (Table II)

Transaction date

Aug 7, 2026

Transaction code

Shares / units

5,053

Price per share

$0.00

Acquired / disposed

Disposed (D)

Shares owned after

Ownership form

Direct

Amendment

Footnotes from the filing

Shares subject to the option are fully vested and immediately exercisable.

Around the same time

Rong Zhou (SENIOR EVP, PRODUCTION CENTER) sold ~$75K of Amphstar Pharmaceuticals, Inc.

Automatic saleFiled 5w ago

Richard K PrinsDirector

Filed 8w ago

Sold

~$162K7,973 sh @ $20.30

Traded Aug 11 · filed 1 day laterNot under a reported trading plan

A Amphstar Pharmaceuticals director sold $162K of Amphstar Pharmaceuticals shares. The filing does not indicate a pre-arranged trading plan.

More Official record

William J PetersCFO, EVP & TREASURER

Filed 8w ago

5,053Shares · @ $19.79

Traded Aug 7 · filed 4 days later

Derivative exercise or conversion — not an open-market buy.

More Official record