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 ↗ |
| 2 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 5.22M | -3.6% | $105.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 16 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | Dimensional Fund Advisors Lp | 2.31M | +13.7% | $46.52M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | State Street Global Advisors ✦ (passive) | 1.64M | +2.1% | $33.14M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 22 | Vanguard Capital Management Llc | 1.48M | -4.0% | $29.91M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 23 | American Century Companies Inc | 1.18M | +15.6% | $23.74M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Marshall Wace ✦ | 1.07M | +4.0% | $21.52M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 25 | Marshall Wace ✦ | 1.07M | +4.0% | $21.52M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 26 | Marshall Wace ✦ | 1.07M | +4.0% | $21.52M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 27 | Geode Capital Management ✦ (passive) | 969.84K | -0.7% | $19.58M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 28 | Geode Capital Management ✦ (passive) | 969.84K | -0.7% | $19.58M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 29 | D. E. Shaw & Co. ✦ | 887.05K | +33.3% | $17.90M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 30 | D. E. Shaw & Co. ✦ | 887.05K | +33.3% | $17.90M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 31 | Renaissance Technologies ✦ | 525.10K | -5.2% | $10.60M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 32 | Goldman Sachs Group ✦ | 505.36K | +53.4% | $10.20M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 33 | Goldman Sachs Group ✦ | 505.36K | +53.4% | $10.20M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 34 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 35 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 36 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 37 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 38 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 39 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 40 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 434.84K | +3.5% | $8.78M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 43 | UBS Group AG | 393.11K | -6.5% | $7.93M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 44 | UBS Group AG | 393.11K | -6.5% | $7.93M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 45 | UBS Group AG | 393.11K | -6.5% | $7.93M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 46 | UBS Group AG | 393.11K | -6.5% | $7.93M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 47 | Hrt Financial Lp | 387.53K | +589.8% | $7.82M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 48 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 49 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 50 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 51 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 52 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 53 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 54 | Northern Trust Corp | 370.99K | -0.3% | $7.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 55 | Charles Schwab Investment… | 310.18K | -3.4% | $6.26M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 56 | Two Sigma Investments ✦ | 248.12K | +79.6% | $5.01M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 57 | First Trust Advisors Lp | 246.95K | +64.0% | $4.98M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 58 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 59 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 61 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 62 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 64 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 65 | Bank of New York Mellon Corp | 532.34K | -2.0% | $4.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 66 | Pacer Advisors, Inc. | 241.18K | -7.8% | $4.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 67 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 68 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 69 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 70 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 71 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 72 | AQR Capital Management ✦ | 208.65K | +164.9% | $4.21M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 73 | Principal Financial Group Inc | 204.25K | -2.3% | $4.12M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 74 | Principal Financial Group Inc | 204.25K | -2.3% | $4.12M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 75 | New York State Common Retirement… | 181.12K | +21.8% | $3.66M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | Jane Street Group, Llc | 178.73K | +93.3% | $3.61M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 77 | Jane Street Group, Llc | 178.73K | +93.3% | $3.61M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 78 | Invesco Ltd. | 158.06K | -73.9% | $3.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 79 | Invesco Ltd. | 158.06K | -73.9% | $3.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 80 | Invesco Ltd. | 158.06K | -73.9% | $3.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 81 | Invesco Ltd. | 158.06K | -73.9% | $3.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 82 | Victory Capital Management Inc | 149.61K | -40.1% | $3.02M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 83 | Universal- Beteiligungs- und… | 139.40K | 0.0% | $2.81M | 0.0% | Held | 3 | SEC ↗ |
| 84 | Universal- Beteiligungs- und… | 139.40K | 0.0% | $2.81M | 0.0% | Held | 3 | SEC ↗ |
| 85 | Bank Of America Corp /De/ | 136.82K | -21.5% | $2.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 86 | Bank Of America Corp /De/ | 136.82K | -21.5% | $2.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 87 | Bank Of America Corp /De/ | 136.82K | -21.5% | $2.76M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 88 | Nordea Investment Management Ab | 126.93K | +2.5% | $2.56M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 89 | Nordea Investment Management Ab | 126.93K | +2.5% | $2.56M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 90 | Arrowstreet Capital ✦ | 116.65K | -64.1% | $2.35M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 91 | Nuveen, LLC | 88.40K | +15.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | Nuveen, LLC | 88.40K | +15.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 93 | Nuveen, LLC | 88.40K | +15.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 94 | Nuveen, LLC | 88.40K | +15.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | Rhumbline Advisers | 80.45K | -3.9% | $1.62M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 96 | Squarepoint Ops LLC | 78.80K | +178.0% | $1.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 97 | Legal & General Group Plc | 78.28K | -3.3% | $1.58M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 98 | Legal & General Group Plc | 78.28K | -3.3% | $1.58M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 99 | Legal & General Group Plc | 78.28K | -3.3% | $1.58M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 100 | Assetmark, Inc | 68.59K | +27.6% | $1.38M | 0.0% | ▲ Add | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
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): 5 holders, 1.03M shares, $928,379 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)
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 ·
Get this via the API