RANCHO CUCAMONGA, CA
AMPHASTAR PHARMACEUTICALS, INC.AMPH— Latest position per institution from SEC 13F filings
15
Institutional holders
32.22M
Total shares held
778.95M
Estimated value
1.61M
Avg. position size
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
5.94M
Value
237.70M
Filed
Jun 30, 2024
BLACKROCK, INC.
CIK 2012383
Shares
5.22M
Value
105.44M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
2.61M
Value
69.85M
Filed
Dec 31, 2025
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
2.31M
Value
46.52M
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
1.64M
Value
33.14M
Filed
Jun 30, 2026
TD ASSET MANAGEMENT INC
CIK 1056053
Shares
1.54M
Value
30.19M
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.48M
Value
29.91M
Filed
Jun 30, 2026
NEUBERGER BERMAN GROUP LLC
CIK 1465109
Shares
1.37M
Value
51.02M
Filed
Dec 31, 2024
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
1.18M
Value
23.74M
Filed
Jun 30, 2026
MARSHALL WACE, LLP
CIK 1318757
Shares
1.07M
Value
21.52M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
969.84K
Value
19.58M
Filed
Jun 30, 2026
FULLER & THALER ASSET MANAGEMENT, INC.
CIK 1082327
Shares
949.24K
Value
19.16M
Filed
Jun 30, 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
D. E. SHAW & CO., INC.
CIK 1009207
Shares
887.05K
Value
17.90M
Filed
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
809.57K
Value
16.34M
Filed
Jun 30, 2026
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM
CIK 1081019
Shares
729.53K
Value
36.15K
Filed
Jun 30, 2026
LSV ASSET MANAGEMENT
CIK 1050470
Shares
642.01K
Value
12.96K
Filed
Jun 30, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
525.10K
Value
10.60M
Filed
Jun 30, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
505.36K
Value
10.20M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK FINANCE, INC. | 1364742 | 5.94M | 237.70M | Jun 30, 2024 |
| 2 | BLACKROCK, INC. | 2012383 | 5.22M | 105.44M | Jun 30, 2026 |
| 3 | VANGUARD GROUP INC | 102909 | 2.61M | 69.85M | Dec 31, 2025 |
| 4 | DIMENSIONAL FUND ADVISORS LP | 354204 | 2.31M | 46.52M | Jun 30, 2026 |
| 5 | STATE STREET CORP | 93751 | 1.64M | 33.14M | Jun 30, 2026 |
| 6 | TD ASSET MANAGEMENT INC | 1056053 | 1.54M | 30.19M | Mar 31, 2026 |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.48M | 29.91M | Jun 30, 2026 |
| 8 | NEUBERGER BERMAN GROUP LLC | 1465109 | 1.37M | 51.02M | Dec 31, 2024 |
| 9 | AMERICAN CENTURY COMPANIES INC | 748054 | 1.18M | 23.74M | Jun 30, 2026 |
| 10 | MARSHALL WACE, LLP | 1318757 | 1.07M | 21.52M | Jun 30, 2026 |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 969.84K | 19.58M | Jun 30, 2026 |
| 12 | FULLER & THALER ASSET MANAGEMENT, INC. | 1082327 | 949.24K | 19.16M | Jun 30, 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 | D. E. SHAW & CO., INC. | 1009207 | 887.05K | 17.90M | Jun 30, 2026 |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 809.57K | 16.34M | Jun 30, 2026 |
| 17 | CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 1081019 | 729.53K | 36.15K | Jun 30, 2026 |
| 18 | LSV ASSET MANAGEMENT | 1050470 | 642.01K | 12.96K | Jun 30, 2026 |
| 19 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 525.10K | 10.60M | Jun 30, 2026 |
| 20 | GOLDMAN SACHS GROUP INC | 886982 | 505.36K | 10.20M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.