Security record
AMPH
Amphastar Pharmaceuticals, Inc. · Healthcare · Drug Manufacturers - Specialty & Generic
77Tracked holders
-4Δ holders
22.11MShares held
$440.50MReported value
+3New positions
−7Exits
Momentum inputs (comparable managers):
holder breadth -4.9% ·
share flow -6.6% ·
net new positions -5.2%
— formula
Broad distribution — falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 77 | -4 | 22.11M | $440.50M | +3 | −7 |
| Q1 2026 | 84 | -10 | 23.72M | $457.46M | +4 | −14 |
| Q4 2025 | 94 | -1 | 25.83M | $677.54M | — | −1 |
| Q3 2025 | 19 | 0 | 15.63M | $416.60M | — | — |
| Q2 2025 | 16 | +1 | 14.08M | $323.35M | +1 | — |
| Q1 2025 | 12 | -1 | 5.84M | $169.25M | — | −1 |
| Q4 2024 | 13 | 0 | 4.91M | $182.39M | — | — |
| Q3 2024 | 12 | +2 | 3.20M | $155.33M | +2 | — |
| Q2 2024 | 10 | — | 3.67M | $146.92M | — | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ ×15 |
| 2 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 3 | State Street Global Advisors ✦ (passive) | 1.64M | +2.1% | $33.14M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 4 | Vanguard Capital Management Llc | 1.48M | -4.0% | $29.91M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | American Century Companies Inc | 1.18M | +15.6% | $23.74M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 6 | Marshall Wace ✦ | 1.07M | +4.0% | $21.52M | 0.0% | ▲ Add | 9 | SEC ↗ ×3 |
| 7 | Geode Capital Management ✦ (passive) | 969.84K | -0.7% | $19.58M | 0.0% | ▼ Trim | 9 | SEC ↗ ×2 |
| 8 | D. E. Shaw & Co. ✦ | 887.05K | +33.3% | $17.90M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 9 | Renaissance Technologies ✦ | 525.10K | -5.2% | $10.60M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 10 | Goldman Sachs Group ✦ | 505.36K | +53.4% | $10.20M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 11 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ ×9 |
| 12 | UBS Group AG | 393.11K | -6.5% | $7.93M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 13 | Hrt Financial Lp | 387.53K | +589.8% | $7.82M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 14 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ ×7 |
| 15 | Charles Schwab Investment… | 310.18K | -3.4% | $6.26M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 16 | Two Sigma Investments ✦ | 248.12K | +79.6% | $5.01M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 17 | First Trust Advisors Lp | 246.95K | +64.0% | $4.98M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ ×8 |
| 19 | Pacer Advisors, Inc. | 241.18K | -7.8% | $4.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 20 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ ×6 |
| 21 | Principal Financial Group Inc | 204.25K | -2.3% | $4.12M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 22 | New York State Common Retirement… | 181.12K | +21.8% | $3.66M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | Jane Street Group, Llc | 178.73K | +93.3% | $3.61M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 24 | Invesco Ltd. | 158.06K | -73.9% | $3.19M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 25 | Victory Capital Management Inc | 149.61K | -40.1% | $3.02M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 26 | Universal- Beteiligungs- und… | 139.40K | 0.0% | $2.81M | 0.0% | Held | 3 | SEC ↗ ×2 |
| 27 | Bank Of America Corp /De/ | 136.82K | -21.5% | $2.76M | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 28 | Nordea Investment Management Ab | 126.93K | +2.5% | $2.56M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 29 | Arrowstreet Capital ✦ | 116.65K | -64.1% | $2.35M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 30 | Nuveen, LLC | 88.40K | +15.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 31 | Rhumbline Advisers | 80.45K | -3.9% | $1.62M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 32 | Squarepoint Ops LLC | 78.80K | +178.0% | $1.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 33 | Legal & General Group Plc | 78.28K | -3.3% | $1.58M | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 34 | Assetmark, Inc | 68.59K | +27.6% | $1.38M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | Ameriprise Financial Inc | 68.24K | -13.4% | $1.38M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 36 | Robeco Institutional Asset… | 66.41K | 0.0% | $1.34M | 0.0% | Held | 2 | SEC ↗ |
| 37 | Swiss National Bank | 64.80K | -10.7% | $1.31M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 38 | JPMorgan Chase ✦ | 57.56K | -45.0% | $1.19M | 0.0% | ▼ Trim | 4 | SEC ↗ ×6 |
| 39 | Wells Fargo & Company/Mn | 55.91K | +33.1% | $1.13M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 40 | Citigroup Inc | 55.78K | +55.4% | $1.13M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 41 | Point72 Asset Management ✦ | 54.96K | New | $1.11M | 0.0% | New | 1 | SEC ↗ |
| 42 | Alliancebernstein L.P. | 56.43K | 0.0% | $1.11M | 0.0% | Held | 3 | SEC ↗ |
| 43 | Bnp Paribas Financial Markets | 54.66K | -65.0% | $1.10M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 44 | Creative Planning | 51.44K | +213.6% | $1.04M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 45 | T. Rowe Price ✦ | 51.10K | +13.8% | $1.03M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 46 | Susquehanna International Group, Llp | 50.56K | +246.3% | $1.02M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 47 | UBS AM, a distinct business unit of… | 44.06K | -20.4% | $889,172 | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 48 | Deutsche Bank Ag\ | 35.31K | +6.6% | $712,495 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 49 | Prudential Financial Inc | 35.13K | -30.7% | $708,984 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 50 | Millennium Management ✦ | 31.81K | -91.4% | $642,007 | 0.0% | ▼ Trim | 9 | SEC ↗ ×2 |
| 51 | Assenagon Asset Management S.A. | 30.43K | +100.0% | $614,118 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 52 | Fidelity (FMR) ✦ | 28.96K | +2137.9% | $584,363 | 0.0% | ▲ Add | 5 | SEC ↗ ×4 |
| 53 | Barclays Plc | 25.22K | +18.5% | $508,879 | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 54 | Franklin Resources Inc | 24.99K | -82.1% | $504,218 | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 55 | Quantinno Capital Management LP | 20.83K | New | $420,289 | 0.0% | New | 1 | SEC ↗ |
| 56 | Raymond James Financial Inc | 19.31K | +1.4% | $389,736 | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 57 | Russell Investments Group, Ltd. | 18.11K | +425.6% | $365,419 | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 58 | Man Group plc | 17.34K | -53.5% | $349,962 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 59 | State Of Wisconsin Investment Board | 17.04K | -2.0% | $343,847 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | Citadel Advisors ✦ | 16.23K | -75.2% | $327,542 | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 61 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 14.87K | -11.7% | $300,137 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 62 | Manufacturers Life Insurance… | 14.25K | -10.3% | $287,504 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Osaic Holdings, Inc. | 12.74K | -2.3% | $257,132 | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 64 | Envestnet Asset Management Inc | 12.00K | -34.3% | $242,140 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 65 | Canada Pension Plan Investment Board | 11.50K | -29.4% | $232,070 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 66 | State Board Of Administration Of… | 10.91K | 0.0% | $220,224 | 0.0% | Held | 3 | SEC ↗ |
| 67 | Gotham Asset Management ✦ | 10.14K | New | $204,605 | 0.0% | New | 1 | SEC ↗ |
| 68 | Zurcher Kantonalbank (Zurich… | 7.78K | 0.0% | $157,061 | 0.0% | Held | 3 | SEC ↗ |
| 69 | Fifth Third Bancorp | 7.30K | -16.6% | $147,320 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 70 | Pnc Financial Services Group, Inc. | 5.00K | -8.2% | $100,981 | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 71 | Royal Bank Of Canada | 4.74K | +34.5% | $97,000 | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 72 | Federated Hermes, Inc. | 2.91K | -79.3% | $58,724 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 73 | Mirae Asset Global Investments Co.… | 1.97K | -16.6% | $39,795 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 74 | Us Bancorp \De\ | 1.12K | +251.9% | $22,581 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Jones Financial Companies Lllp | 228 | -20.8% | $4,966 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 76 | Optiver Holding B.V. | 192 | +585.7% | $3,875 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 77 | Rockefeller Capital Management L.P. | 7 | -94.3% | $141 | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Point72 Asset Management | $1.11M | 0.0% |
| Quantinno Capital Management… | $420,289 | 0.0% |
| Gotham Asset Management | $204,605 | 0.0% |
Exited
| Td Asset Management Inc | $30.19M | was 0.0% |
| Hsbc Holdings Plc | $753,497 | was 0.0% |
| Mml Investors Services, Llc | $242,270 | was 0.0% |
| Cetera Investment Advisers | $100,289 | was 0.0% |
| BNP Paribas Asset Management… | $7,758 | was 0.0% |
| Simplex Trading, Llc | $5,132 | was 0.0% |
| Group One Trading Llc | $4,192 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 212 holders, 31.98M shares, $604.53M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Sep 21
PETERS WILLIAM J
Officer, Director · 4.14K sh · $103,475
Sep 16
Zhou Rong
Officer · 10.00K sh · $239,404
Sep 02
Zhou Rong
Officer · 3.19K sh · $75,306
Aug 11
PRINS RICHARD K
Director · 7.97K sh · $161,852
Aug 07
PETERS WILLIAM J
Officer, Director · 8.18K sh · $183,886
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Jul 14
SC 13G — DIMENSIONAL FUND ADVISORS LP
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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