RANCHO CUCAMONGA, CA
AMPHASTAR PHARMACEUTICALS, INC.AMPH— Latest position per institution from SEC 13F filings
15
Institutional holders
32.04M
Total shares held
779.08M
Estimated value
1.60M
Avg. position size
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
5.94M
Value
237.70M
Filed
Jun 30, 2024
BLACKROCK, INC.
CIK 2012383
Shares
5.42M
Value
106.20M
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
2.61M
Value
69.85M
Filed
Dec 31, 2025
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
2.03M
Value
39.73M
Filed
Mar 31, 2026
STATE STREET CORP
CIK 93751
Shares
1.61M
Value
31.49M
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.54M
Value
30.24M
Filed
Mar 31, 2026
TD ASSET MANAGEMENT INC
CIK 1056053
Shares
1.54M
Value
30.19M
Filed
Mar 31, 2026
FULLER & THALER ASSET MANAGEMENT, INC.
CIK 1082327
Shares
1.40M
Value
27.33M
Filed
Mar 31, 2026
NEUBERGER BERMAN GROUP LLC
CIK 1465109
Shares
1.37M
Value
51.02M
Filed
Dec 31, 2024
MARSHALL WACE, LLP
CIK 1318757
Shares
1.03M
Value
20.09M
Filed
Mar 31, 2026
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
1.02M
Value
19.93M
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
976.65K
Value
19.14M
Filed
Mar 31, 2026
BOSTON TRUST WALDEN CORP
CIK 1534866
Shares
944.79K
Value
18.51M
Filed
Mar 31, 2026
EPOCH INVESTMENT PARTNERS, INC.
CIK 1305841
Shares
898.89K
Value
17.61M
Filed
Mar 31, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
787.82K
Value
15.43M
Filed
Mar 31, 2026
D. E. SHAW & CO., INC.
CIK 1009207
Shares
665.54K
Value
13.04M
Filed
Mar 31, 2026
LSV ASSET MANAGEMENT
CIK 1050470
Shares
651.71K
Value
12.77K
Filed
Mar 31, 2026
INVESCO LTD.
CIK 914208
Shares
604.77K
Value
11.85M
Filed
Mar 31, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
553.90K
Value
10.85M
Filed
Mar 31, 2026
SYSTEMATIC FINANCIAL MANAGEMENT LP
CIK 1085936
Shares
452.90K
Value
8.87M
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK FINANCE, INC. | 1364742 | 5.94M | 237.70M | Jun 30, 2024 |
| 2 | BLACKROCK, INC. | 2012383 | 5.42M | 106.20M | Mar 31, 2026 |
| 3 | VANGUARD GROUP INC | 102909 | 2.61M | 69.85M | Dec 31, 2025 |
| 4 | DIMENSIONAL FUND ADVISORS LP | 354204 | 2.03M | 39.73M | Mar 31, 2026 |
| 5 | STATE STREET CORP | 93751 | 1.61M | 31.49M | Mar 31, 2026 |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.54M | 30.24M | Mar 31, 2026 |
| 7 | TD ASSET MANAGEMENT INC | 1056053 | 1.54M | 30.19M | Mar 31, 2026 |
| 8 | FULLER & THALER ASSET MANAGEMENT, INC. | 1082327 | 1.40M | 27.33M | Mar 31, 2026 |
| 9 | NEUBERGER BERMAN GROUP LLC | 1465109 | 1.37M | 51.02M | Dec 31, 2024 |
| 10 | MARSHALL WACE, LLP | 1318757 | 1.03M | 20.09M | Mar 31, 2026 |
| 11 | AMERICAN CENTURY COMPANIES INC | 748054 | 1.02M | 19.93M | Mar 31, 2026 |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 976.65K | 19.14M | Mar 31, 2026 |
| 13 | BOSTON TRUST WALDEN CORP | 1534866 | 944.79K | 18.51M | Mar 31, 2026 |
| 14 | EPOCH INVESTMENT PARTNERS, INC. | 1305841 | 898.89K | 17.61M | Mar 31, 2026 |
| 15 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 787.82K | 15.43M | Mar 31, 2026 |
| 16 | D. E. SHAW & CO., INC. | 1009207 | 665.54K | 13.04M | Mar 31, 2026 |
| 17 | LSV ASSET MANAGEMENT | 1050470 | 651.71K | 12.77K | Mar 31, 2026 |
| 18 | INVESCO LTD. | 914208 | 604.77K | 11.85M | Mar 31, 2026 |
| 19 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 553.90K | 10.85M | Mar 31, 2026 |
| 20 | SYSTEMATIC FINANCIAL MANAGEMENT LP | 1085936 | 452.90K | 8.87M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.