AMPH · Amphastar Pharmaceuticals, Inc. · Shareholders & Ownership
Every disclosed holder of AMPH in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns AMPH
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 28,293,220 | 66.51% |
| Insiders (Forms 3, 4, 5) | 11,901,416 | 27.98% |
| 13D/G-only blocks | 8,851,868 | 20.81% |
| Remaining | 6,508,560 | -15.30% |
| Registered funds (N-PORT, not summed) | 15,070,112 | 35.43% |
Shares outstanding: 42,537,944, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of AMPH
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
Zhang Jack Y.
Insider
CIK 1611157 · Mar 15, 2026
Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner, issuer-wide
|
11,062,856 | ||
| 1.1 |
|
12,524,153 | ||
| 2 |
BlackRock Inc.
13G
CIK 1364742 · Holding company · Dec 31, 2023
Rule 13d-1(b), qualified institution
|
6,037,158 | ||
| 3 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,224,934 | ||
| 3.1 |
iShares Core S&P Small-Cap ETF
Fund
S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
2,045,920 | ||
| 3.2 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
847,727 | ||
| 3.3 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
303,954 | ||
| 3.4 |
iShares S&P Small-Cap 600 Growth ETF
Fund
S000004314 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
159,352 | ||
| 3.5 |
iShares S&P Small-Cap 600 Value ETF
Fund
S000004316 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
141,236 | ||
| 4 |
VANGUARD GROUP INC
13G
CIK 102909 · Registered investment adviser · Dec 29, 2023
Rule 13d-1(b), qualified institution
|
2,814,710 | ||
| 5 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,305,107 | ||
| 5.1 |
DIMENSIONAL FUND ADVISORS LP
13G
CIK 354204 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
2,305,107 | ||
| 5.2 |
U.S. SMALL CAP VALUE PORTFOLIO
Fund
S000000987 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
596,077 | ||
| 5.3 |
Dimensional U.S. Targeted Value ETF
Fund
S000070901 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
285,363 | ||
| 5.4 |
U.S. Targeted Value Portfolio
Fund
S000000970 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
276,227 | ||
| 5.5 |
Dimensional US Small Cap Value ETF
Fund
S000075151 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
256,428 | ||
| 6 |
|
1,642,126 | ||
| 6.1 |
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund
S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
306,646 | ||
| 6.2 |
State Street(R) SPDR(R) S&P(R) Pharmaceuticals ETF
Fund
S000012321 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
265,621 | ||
| 6.3 |
State Street(R) SPDR(R) S & P 600(TM) Small Cap Growth ETF
Fund
S000006990 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
98,150 | ||
| 6.4 |
State Street(R) SPDR(R) S & P 600(TM) Small Cap Value ETF
Fund
S000006974 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
80,228 | ||
| 6.5 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
12,427 | ||
| 7 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,481,952 | ||
| 8 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,176,626 | ||
| 9 |
MARSHALL WACE, LLP
13F
CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,066,322 | ||
| 10 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,055,676 | ||
| 11 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
969,840 | ||
| 12 |
FULLER & THALER ASSET MANAGEMENT, INC.
13F
CIK 1082327 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
949,238 | ||
| 13 |
Avantis U.S. Small Cap Value ETF
Fund
S000066459 · Registered fund · May 31, 2026
American Century ETF Trust, not summed
|
945,543 | ||
| 14 |
FULLERTHALER BEHAVIORAL SMALL CAP EQUITY
Fund
S000051163 · Registered fund · Jun 30, 2026
Capitol Series Trust, not summed
|
902,737 | ||
| 15 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
887,048 | ||
| 16 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
809,568 | ||
| 17 |
LSV ASSET MANAGEMENT
13F
CIK 1050470 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
642,014 | ||
| 17.1 |
LSV Small Cap Value Fund
Fund
S000039922 · Registered fund · Jul 31, 2026
ADVISORS' INNER CIRCLE FUND, not summed
|
62,154 | ||
| 18 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
525,100 | ||
| 19 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
505,360 | ||
| 19.1 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
49,047 | ||
| 19.2 |
Goldman Sachs Small Cap Value Insights Fund
Fund
S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
26,212 | ||
| 19.3 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
|
3,325 | ||
| 20 |
SYSTEMATIC FINANCIAL MANAGEMENT LP
13F
CIK 1085936 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
437,384 | ||
| 21 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
434,840 | ||
| 21.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
15 | ||
| 22 |
|
393,110 | ||
| 23 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
391,083 | ||
| 24 |
HRT FINANCIAL LP
13F
CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
387,530 | ||
| 25 |
DENALI ADVISORS LLC
13F
CIK 1142941 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
375,965 | ||
| 26 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
370,991 | ||
| 26.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
15,893 | ||
| 26.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
6,755 | ||
| 26.3 |
Small Cap Value Fund
Fund
S000001246 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
3,829 | ||
| 26.4 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
948 | ||
| 27 |
Bridge City Capital, LLC
13F
CIK 1713521 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
338,708 | ||
| 28 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
310,178 | ||
| 28.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
171,014 | ||
| 28.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
78,622 | ||
| 28.3 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
21,605 | ||
| 28.4 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
19,039 | ||
| 29 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F
CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
298,954 | ||
| 29.1 |
Omni Small-Cap Value Fund
Fund
S000033567 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
89,142 | ||
| 29.2 |
Small-Cap Value Fund
Fund
S000004427 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
47,000 | ||
| 30 |
ROYCE & ASSOCIATES LP
13F
CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
294,758 | ||
| 30.1 |
Royce Capital Fund - Small-Cap Portfolio
Fund
S000009497 · Registered fund · Jun 30, 2026
ROYCE CAPITAL FUND, not summed
|
84,036 | ||
| 30.2 |
Royce Small-Cap Fund
Fund
S000009507 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
79,030 | ||
| 30.3 |
Royce Small-Cap Value Fund
Fund
S000009516 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
50,299 | ||
| 31 |
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund
S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
|
269,433 | ||
| 32 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
248,115 | ||
| 33 |
FIRST TRUST ADVISORS LP
13F
CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
246,951 | ||
| 33.1 |
First Trust Small Cap Core AlphaDEX Fund
Fund
S000017339 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
216,138 | ||
| 33.2 |
First Trust Small Cap Value AlphaDEX Fund
Fund
S000031807 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
59,218 | ||
| 33.3 |
First Trust Multi Cap Value AlphaDEX Fund
Fund
S000017342 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
10,242 | ||
| 34 |
Pacer Advisors, Inc.
13F
CIK 1616667 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
241,181 | ||
| 35 |
Pacer US Small Cap Cash Cows 100 ETF
Fund
S000055468 · Registered fund · Jul 31, 2026
Pacer Funds Trust, not summed
|
232,400 | ||
| 36 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
232,343 | ||
| 37 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
224,478 | ||
| 38 |
AQR CAPITAL MANAGEMENT LLC
13F
CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
208,651 | ||
| 38.1 |
AQR Small Cap Multi-Style Fund
Fund
S000040064 · Registered fund · Jun 30, 2026
AQR Funds, not summed
|
7,861 | ||
| 39 |
PRINCIPAL FINANCIAL GROUP INC
13F
CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
204,250 | ||
| 39.1 |
Principal U.S. Small-Cap ETF
Fund
S000055159 · Registered fund · Jun 30, 2026
Principal Exchange-Traded Funds, not summed
|
39,743 | ||
| 39.2 |
SmallCap S&P 600 Index Fund
Fund
S000007203 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
25,015 | ||
| 39.3 |
SmallCap Value Fund II
Fund
S000007169 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
2,126 | ||
| 40 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
184,496 | ||
| 41 |
NEW YORK STATE COMMON RETIREMENT FUND
13F
CIK 810265 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
181,122 | ||
| 42 |
Applied Finance Explorer Fund
Fund
S000049148 · Registered fund · Jul 31, 2026
World Funds Trust, not summed
|
180,913 | ||
| 43 |
JANE STREET GROUP, LLC
13F
CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
178,734 | ||
| 44 |
|
174,203 | ||
| 45 |
|
168,707 | ||
| 46 |
Empowered Funds, LLC
13F
CIK 1592828 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
162,812 | ||
| 46.1 |
EA Bridgeway Omni Small-Cap Value ETF
Fund
S000078089 · Registered fund · Jun 30, 2026
EA Series Trust, not summed
|
162,812 | ||
| 47 |
O'SHAUGHNESSY ASSET MANAGEMENT, LLC
13F
CIK 1423442 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
159,427 | ||
| 48 |
|
159,350 | ||
| 49 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
158,064 | ||
| 49.1 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
56,490 | ||
| 49.2 |
Invesco S&P SmallCap 600 Revenue ETF
Fund
S000064596 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
42,640 | ||
| 49.3 |
Invesco S&P SmallCap Health Care ETF
Fund
S000028299 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
24,785 | ||
| 49.4 |
Invesco S&P SmallCap 600 QVM Multi-Factor ETF
Fund
S000072320 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
5,827 | ||
| 49.5 |
Invesco Nasdaq Biotechnology ETF
Fund
S000072469 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
2,430 | ||
| 50 |
VICTORY CAPITAL MANAGEMENT INC
13F
CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
149,612 | ||
| 50.1 |
VictoryShares Small Cap Free Cash Flow ETF
Fund
S000080690 · Registered fund · Jun 30, 2026
Victory Portfolios II, not summed
|
81,076 | ||
| 50.2 |
Victory Small Cap Stock Fund
Fund
S000012914 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
60,972 | ||
| 50.3 |
Victory Extended Market Index Fund
Fund
S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
3,810 | ||
| 50.4 |
Victory Cornerstone Aggressive Fund
Fund
S000037226 · Registered fund · May 31, 2026
Victory Portfolios III, not summed
|
2,561 |
35 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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