Amphastar Pharmaceuticals, Inc. AMPH

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27.12 USD +0.09 (+0.33%)

At closeNov 3, 2026, 4:01 PM EST

27.12 0.00 0.00%

After hours · Nov 3, 4:01 PM ET

26.85 Day range 27.39

16.65 52-week range 29.52

Held by insiders 30.81%

Held by institutions 68.61%

Float held by institutions 99.17%

Institutions 308

Top institutional holders
Holder	% held	Shares	Value	Reported
Blackrock Inc.	12.28%	5,224,934	141.70M	Jun 29, 2026
Dimensional Fund Advisors LP	5.42%	2,305,107	62.51M	Jun 29, 2026
State Street Corporation	3.86%	1,642,126	44.53M	Jun 29, 2026
Vanguard Capital Management LLC	3.48%	1,481,952	40.19M	Jun 29, 2026
American Century Companies Inc	2.77%	1,176,626	31.91M	Jun 29, 2026
Marshall Wace LLP	2.51%	1,066,322	28.92M	Jun 29, 2026

Top mutual fund holders
Holder	% held	Shares	Value	Reported
iShares Trust-iShares Core S&P Small-Cap ETF	4.40%	1,873,133	50.80M	Sep 29, 2026
American Century ETF Trust-Avantis U.S. Small Cap Value ETF	3.06%	1,303,435	35.35M	Sep 29, 2026
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund	2.48%	1,055,676	28.63M	Jun 29, 2026
Capitol Series Trust-FullerThaler Behavioral Small-Cap Equity Fund	2.12%	902,737	24.48M	Jun 29, 2026
iShares Trust-iShares Russell 2000 ETF	1.97%	839,366	22.76M	Sep 29, 2026
DFA INVESTMENT DIMENSIONS GROUP INC-U.S. Small Cap Value Portfolio	1.40%	596,077	16.17M	Jul 30, 2026

AMPH insiders
Insider	Relation	Latest transaction	Date	Shares held
DEFLIN GAYLE	Director	Stock Award(Grant)	May 31, 2026	19,057
GERST DIANE G.	Director	Stock Award(Grant)	May 31, 2026	31,899
LEE HOWARD S	Director	Stock Award(Grant)	May 31, 2026	159,350
LIAWATIDEWI YAKOB	Officer and Director	Stock Award(Grant)	Mar 8, 2026	125,384
PETERS WILLIAM J	Chief Financial Officer	Sale	Sep 20, 2026	168,707
PETERSEN FLOYD F	Director	Sale	Dec 11, 2025	71,368

Held by funds