AMPH · Amphastar Pharmaceuticals, Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding AMPH
All superinvestors →Holder Concentration
Across 212 13F filersWho Holds AMPH
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 211 filers, like-for-like change -12.5%; actively managed books -19.2%; index-like books -0.8%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 44.4% | 104 | -11.8% |
| Exempt adviser | 4.0% | 3 | +8.0% |
| Adviser | 1.0% | 5 | -66.1% |
| Bank | 10.6% | 14 | -1.7% |
| Insurer | 0.9% | 3 | -3.5% |
| Benefit plan | 0.2% | 4 | +13.4% |
| Non-US | 1.2% | 7 | -24.0% |
| Holding company | 21.9% | 5 | +0.3% |
| Broker-dealer | 0.0% | 0 | -100.0% |
| Unknown | 15.7% | 66 | -27.9% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 42.1% | 30 | -0.8% |
| Systematic-like | 9.5% | 19 | +1.0% |
| Concentrated | 0.5% | 22 | -8.2% |
| Diversified active | 47.8% | 140 | -22.4% |
| Unknown | 0.0% | 0 | -100.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 55.5% | 115 | -19.7% |
| Medium turnover | 23.3% | 54 | -7.9% |
| High turnover | 11.8% | 26 | +14.0% |
| Unknown | 9.4% | 16 | -1.0% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 10.0% | 24 | -0.5% |
| Medium horizon | 20.8% | 32 | -3.0% |
| Long horizon | 60.8% | 145 | -20.2% |
| Unknown | 8.4% | 10 | +28.8% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 3.4% | 36 | +0.3% |
| $1B to $10B | 5.0% | 58 | -2.0% |
| $10B to $100B | 20.8% | 59 | -26.7% |
| $100B or more | 70.8% | 58 | -8.5% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.9% | 46 | +23.3% |
| Pooled investment vehicles | 4.5% | 16 | -30.0% |
| Registered funds and BDCs | 29.0% | 18 | -5.0% |
| Pension and profit sharing plans | 0.0% | 1 | +39.1% |
| Insurance companies | 0.1% | 2 | 0.0% |
| Governments and sovereign funds | 3.4% | 5 | +15.8% |
| Other investment advisers | 0.1% | 3 | -28.4% |
| Other | 0.1% | 1 | -5.6% |
| Diversified | 5.4% | 12 | -37.8% |
| Unknown | 55.6% | 107 | -13.0% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 10.0% | 26 | -7.8% |
| Private equity funds | 1.0% | 8 | -18.2% |
| Venture capital funds | 0.0% | 1 | +17600.0% |
| Real estate funds | 0.1% | 4 | +11.5% |
| Securitized asset funds | 0.2% | 1 | -20.4% |
| Other private funds | 15.2% | 14 | -11.6% |
| Mixed private funds | 0.2% | 1 | 0.0% |
| No private funds | 21.7% | 52 | -10.2% |
| Private funds, type not stated | 0.0% | 0 | -100.0% |
| Unknown | 51.6% | 104 | -14.3% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 91.4% | 176 | -8.5% |
| Outside the US | 8.6% | 35 | -40.0% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 2 holders with no observed 2026-03-31 13F and 2 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
211 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 36.1% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies AMPH's active holders also own, quarter ended Jun 30, 2026Shareholder Targets
13F filers that own its peers but not AMPH, quarter ended Jun 30, 2026Found through its holder-overlap peers: IMKTA, HRMY, AMD, TSLA, ABBV, WMT, BRK-B, NVDA, AMZN. 6,774 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | NORGES BANK Non-US, Index-like | $153,719,260,857 8 held | NVDA, AMZN, TSLA |
| 2 | Capital Research Global Investors Adviser, Diversified active | $82,016,250,143 7 held | NVDA, AMZN, ABBV |
| 3 | Capital World Investors Adviser, Diversified active | $63,526,447,703 7 held | NVDA, TSLA, AMZN |
| 4 | Amundi Holding company, Index-like | $63,442,660,538 8 held | NVDA, AMZN, TSLA |
| 5 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $51,188,275,141 8 held | NVDA, AMZN, AMD |
| 6 | Fisher Asset Management, LLC Adviser, Diversified active | $33,998,918,571 7 held | NVDA, AMZN, WMT |
| 7 | Capital International Investors Adviser, Diversified active | $33,670,738,011 6 held | NVDA, AMZN, ABBV |
| 8 | JENNISON ASSOCIATES LLC Registered adviser, Diversified active | $33,250,540,119 6 held | NVDA, AMZN, AMD |
| 9 | HSBC HOLDINGS PLC Unknown, Index-like | $32,480,145,705 8 held | NVDA, AMZN, TSLA |
| 10 | Mitsubishi UFJ Asset Management Co., Ltd. Unknown, Index-like | $28,260,338,176 7 held | NVDA, AMZN, TSLA |
Fund Ownership of AMPH by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 22.88% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 4.15% | 1,766,597 |
| Index ETFs | 18.73% | 7,966,134 |
| Active ETFs | 2.63% | 1,119,609 |
| Active funds | 7.74% | 3,291,370 |
| Unclassified | 2.56% | 1,088,404 |
| All registered funds | 35.81% | 15,232,114 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $105,439,161 | 18.40% | 5,224,934 | Shares | 2026-08-07 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $46,517,057 | 8.12% | 2,305,107 | Shares | 2026-08-11 | |
| Mega STATE STREET CORP Bank | $33,138,102 | 5.78% | 1,642,126 | Shares | 2026-09-22 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $29,905,791 | 5.22% | 1,481,952 | Shares | 2026-08-13 | |
| Mega AMERICAN CENTURY COMPANIES INC | $23,744,312 | 4.14% | 1,176,626 | Shares | 2026-08-12 | |
| Large MARSHALL WACE, LLP Exempt adviser | $21,518,377 | 3.76% | 1,066,322 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $19,571,370 | 3.42% | 969,840 | Shares | 2026-08-12 | |
| Large FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser | $19,155,622 | 3.34% | 949,238 | Shares | 2026-08-12 | |
| Mega D. E. Shaw & Co., Inc. | $17,900,628 | 3.12% | 887,048 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $16,337,082 | 2.85% | 809,568 | Shares | 2026-08-13 | |
| Large LSV ASSET MANAGEMENT Registered adviser | $12,955,842 | 2.26% | 642,014 | Shares | 2026-08-06 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $10,596,518 | 1.85% | 525,100 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $10,198,163 | 1.78% | 505,360 | Shares | 2026-08-14 | |
| Mid SYSTEMATIC FINANCIAL MANAGEMENT LP Registered adviser | $8,826,408 | 1.54% | 437,384 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $8,775,068 | 1.53% | 434,840 | Shares | 2026-08-13 | |
| Mega UBS Group AG Bank | $7,932,958 | 1.38% | 393,110 | Shares | 2026-08-13 | |
| Large HRT FINANCIAL LP | $7,820,355 | 1.36% | 387,530 | Shares | 2026-08-14 | |
| Small DENALI ADVISORS LLC Registered adviser | $7,586,973 | 1.32% | 375,965 | Shares | 2026-08-10 | |
| Mega NORTHERN TRUST CORP Bank | $7,486,595 | 1.31% | 370,991 | Shares | 2026-08-13 | |
| Small Bridge City Capital, LLC Registered adviser | $6,835,127 | 1.19% | 338,708 | Shares | 2026-08-11 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $6,259,392 | 1.09% | 310,178 | Shares | 2026-08-14 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC Registered adviser | $6,032,891 | 1.05% | 298,954 | Shares | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP Registered adviser | $5,948,216 | 1.04% | 294,758 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $5,006,960 | 0.87% | 248,115 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $4,983,471 | 0.87% | 246,951 | Shares | 2026-08-11 | |
| Large Pacer Advisors, Inc. | $4,867,032 | 0.85% | 241,181 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $4,688,679 | 0.82% | 232,343 | Shares | 2026-08-06 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $4,529,966 | 0.79% | 224,478 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $4,210,575 | 0.73% | 208,651 | Shares | 2026-08-14 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $4,121,764 | 0.72% | 204,250 | Shares | 2026-08-04 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $3,655,041 | 0.64% | 181,122 | Shares | 2026-07-29 | |
| Mega JANE STREET GROUP, LLC | $3,606,851 | 0.63% | 178,734 | Shares | 2026-08-14 | |
| Large Empowered Funds, LLC Registered adviser | $3,285,546 | 0.57% | 162,812 | Shares | 2026-08-17 | |
| Large O'SHAUGHNESSY ASSET MANAGEMENT, LLC Registered adviser | $3,217,236 | 0.56% | 159,427 | Shares | 2026-08-13 | |
| Mega Invesco Ltd. Adviser | $3,189,730 | 0.56% | 158,064 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $3,019,170 | 0.53% | 149,612 | Shares | 2026-08-07 | |
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $2,813,132 | 0.49% | 139,402 | Shares | 2026-08-06 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $2,761,107 | 0.48% | 136,824 | Shares | 2026-08-14 | |
| Mid ALGERT GLOBAL LLC Registered adviser | $2,651,652 | 0.46% | 131,400 | Shares | 2026-08-13 | |
| Small LAM GROUP, INC. Registered adviser | $2,639,544 | 0.46% | 130,800 | Shares | 2026-07-10 | |
| Mega NORDEA INVESTMENT MANAGEMENT AB Non-US | $2,561,467 | 0.45% | 126,931 | Shares | 2026-08-05 | |
| Large BESSEMER GROUP INC | $2,445,294 | 0.43% | 121,345 | Shares | 2026-08-12 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $2,354,057 | 0.41% | 116,653 | Shares | 2026-08-13 | |
| Large Public Sector Pension Investment Board Non-US | $2,353,956 | 0.41% | 116,648 | Shares | 2026-08-13 | |
| Mega Nuveen, LLC | $1,783,851 | 0.31% | 88,397 | Shares | 2026-08-11 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $1,768,555 | 0.31% | 87,639 | Shares | 2026-08-13 | |
| Large EXCHANGE TRADED CONCEPTS, LLC Registered adviser | $1,756,748 | 0.31% | 87,054 | Shares | 2026-08-11 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $1,623,561 | 0.28% | 80,454 | Shares | 2026-08-12 | |
| Large Squarepoint Ops LLC Registered adviser | $1,590,083 | 0.28% | 78,795 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $1,579,709 | 0.28% | 78,281 | Shares | 2026-08-14 | |
| Large ASSETMARK, INC Registered adviser | $1,384,146 | 0.24% | 68,590 | Shares | 2026-07-30 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $1,377,163 | 0.24% | 68,244 | Shares | 2026-08-14 | |
| Large Robeco Institutional Asset Management B.V. | $1,340,093 | 0.23% | 66,407 | Shares | 2026-07-21 | |
| Mega Swiss National Bank | $1,307,664 | 0.23% | 64,800 | Shares | 2026-08-11 | |
| Small SummerHaven Investment Management, LLC | $1,260,870 | 0.22% | 48,852 | Shares | 2026-10-19 | |
| Mid SteelPeak Wealth, LLC Registered adviser | $1,257,153 | 0.22% | 48,708 | Shares | 2026-10-16 | |
| Mega JPMORGAN CHASE & CO Bank | $1,161,618 | 0.20% | 57,563 | Shares | 2026-08-12 | |
| Mid Jump Financial, LLC | $1,145,840 | 0.20% | 56,781 | Shares | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $1,138,757 | 0.20% | 56,430 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $1,128,323 | 0.20% | 55,913 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $1,125,619 | 0.20% | 55,779 | Shares | 2026-08-03 | |
| Large Point72 Asset Management, L.P. Registered adviser | $1,109,173 | 0.19% | 54,964 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $1,103,099 | 0.19% | 54,663 | Shares | 2026-08-13 | |
| Mega Creative Planning Registered adviser | $1,038,139 | 0.18% | 51,444 | Shares | 2026-08-13 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $1,031,258 | 0.18% | 51,103 | Shares | 2026-08-14 | |
| Large VOLORIDGE INVESTMENT MANAGEMENT, LLC Registered adviser | $1,027,404 | 0.18% | 50,912 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1,020,401 | 0.18% | 50,565 | Shares | 2026-08-14 | |
| Large INTECH INVESTMENT MANAGEMENT LLC Registered adviser | $1,005,751 | 0.18% | 49,839 | Shares | 2026-08-10 | |
| Mid XTX Topco Ltd | $944,585 | 0.16% | 46,808 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $889,170 | 0.16% | 44,062 | Shares | 2026-08-13 | |
| Mid Polaris Capital Management, LLC Registered adviser | $872,421 | 0.15% | 43,232 | Shares | 2026-07-27 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $729,527 | 0.13% | 36,151 | Shares | 2026-08-24 | |
| Mega DEUTSCHE BANK AG\ Non-US | $712,495 | 0.12% | 35,307 | Shares | 2026-08-07 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $708,983 | 0.12% | 35,133 | Shares | 2026-08-12 | |
| Large Vident Advisory, LLC Registered adviser | $690,579 | 0.12% | 34,221 | Shares | 2026-08-12 | |
| Large Brevan Howard Capital Management LP Exempt adviser | $690,176 | 0.12% | 34,201 | Shares | 2026-08-14 | |
| Mid Legato Capital Management LLC Registered adviser | $688,844 | 0.12% | 34,135 | Shares | 2026-08-06 | |
| Large Janney Montgomery Scott LLC Adviser | $682,911 | 0.12% | 33,841 | Shares | 2026-08-05 | |
| Mid SEGALL BRYANT & HAMILL, LLC Registered adviser | $672,357 | 0.12% | 33,318 | Shares | 2026-08-12 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $642,006 | 0.11% | 31,814 | Shares | 2026-08-14 | |
| Mega SG Americas Securities, LLC | $639,887 | 0.11% | 31,709 | Shares | 2026-08-07 | |
| Mid Engineers Gate Manager LP | $609,254 | 0.11% | 30,191 | Shares | 2026-08-14 | |
| Small Illumine Investment Management, LLC | $594,180 | 0.10% | 0 | Shares | 2026-07-29 | |
| Mega FMR LLC Holding company | $584,371 | 0.10% | 28,958 | Shares | 2026-08-13 | |
| Large CANADA LIFE ASSURANCE Co | $540,561 | 0.09% | 26,787 | Shares | 2026-08-13 | |
| Mid State of Alaska, Department of Revenue | $514,830 | 0.09% | 19,947 | Shares | 2026-10-15 | |
| Mid Advisor OS, LLC Registered adviser | $512,672 | 0.09% | 25,405 | Shares | 2026-08-05 | |
| Small ADVISORY RESEARCH INC Registered adviser | $511,300 | 0.09% | 25,337 | Shares | 2026-08-13 | |
| Mega BARCLAYS PLC Bank | $508,878 | 0.09% | 25,217 | Shares | 2026-08-14 | |
| Mega FRANKLIN RESOURCES INC Adviser | $504,216 | 0.09% | 24,986 | Shares | 2026-08-13 | |
| Large Quadrature Capital Ltd | $492,957 | 0.09% | 24,428 | Shares | 2026-08-07 | |
| Mid Campbell & CO Investment Adviser LLC Registered adviser | $468,397 | 0.08% | 23,211 | Shares | 2026-08-03 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $465,189 | 0.08% | 23,052 | Shares | 2026-08-13 | |
| Large Thrivent Financial for Lutherans Registered adviser | $449,913 | 0.08% | 22,295 | Shares | 2026-08-14 | |
| Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM | $427,412 | 0.07% | 21,180 | Shares | 2026-07-23 | |
| Large Quantinno Capital Management LP Registered adviser | $420,288 | 0.07% | 20,827 | Shares | 2026-08-13 | |
| Large MetLife Investment Management, LLC Registered adviser | $418,956 | 0.07% | 20,761 | Shares | 2026-08-14 | |
| Large Assenagon Asset Management S.A. | $392,724 | 0.07% | 15,216 | Shares | 2026-10-15 | |
| Mega RAYMOND JAMES FINANCIAL INC | $389,736 | 0.07% | 19,313 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $365,418 | 0.06% | 18,108 | Shares | 2026-08-06 |
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