DIMENSIONAL FUND ADVISORS LP → Amphastar Pharmaceuticals Inc AMPH

Stake: — Shares: — Class: Common Stock

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

2 transactions

2 buys · 0 sales · 0 awards/exercises

Issuer Cluster

1 13D/G filings on this issuer

0 other filings besides this one

Filer Track Record

7 filings by this filer

6 other filings in the data moat

Short Interest · settle 2026-06-30

DTC 5.24

3,845,576 shares short · +1.2% vs prior

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-07-09	Pierce Anthony T	director	Award	7,886	—	—
2026-07-09	Pierce Anthony T	director	Award	16,646	$19.02	$317K

Other Filings by DIMENSIONAL FUND ADVISORS LP

Filed	Form	Issuer	Stake	Shares
2026-07-14	SCHEDULE 13G	Advance Auto Parts Inc	—	—	view →
2026-07-14	SCHEDULE 13G	Axis Capital Holdings Ltd	—	—	view →
2026-07-14	SCHEDULE 13G	Astronics Corp	—	—	view →
2026-07-14	SCHEDULE 13G	AdvanSix Inc	—	—	view →
2026-07-14	SCHEDULE 13G	Apogee Enterprises Inc	—	—	view →
2026-07-14	SCHEDULE 13G	Allegiant Travel Co	—	—	view →

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