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AMPH — AMPHASTAR PHARMACEUTICALS IN

Reported value held$226.06M
Funds holding (latest)40
SectorHealth Care
Funds holding (Q2 2026)34
Institutional value$152.92M · 15.29M sh
New / Add / Cut / Exit2 / 10 / 20 / 1
Top-5 / Top-10 concentration52.2% / 74.3%
Institutional holdings change Reducing -23.5% (-4.70M sh)
Institutional value change Down -3.3%

As of Q2 2026, 34 SEC-registered investment managers reported holding AMPH (AMPHASTAR PHARMACEUTICALS IN) in their latest 13F filings, with a combined reported value of $152.92M across 15.29M shares. That is -23.5% by share count (-4.70M shares) versus the previous quarter, while reported value moved -3.3%. Ownership is concentrated: the five largest holders account for 52.2% of reported value and the top ten for 74.3%.

Compared with the prior quarter, 2 opened new positions, 10 added to existing stakes, 20 trimmed, 1 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

AMPH is classified in the Health Care sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

Q2 2026 — 34 funds

FundSharesValuePortfolio WeightChange
Marshall Wace history 1.07M $21.52M 0.02% Add
Geode Capital Management history 969.84K $19.58M 0.00% Reduce
D. E. Shaw & Co history 887.05K $17.90M 0.01% Add
Renaissance Technologies history 525.10K $10.60M 0.01% Reduce
Goldman Sachs Group history 505.36K $10.20M 0.00% Add
UBS Group AG history 393.11K $7.93M 0.00% Reduce
Northern Trust Corp history 370.99K $7.49M 0.00% Hold
Charles Schwab Investment Management history 310.18K $6.26M 0.00% Reduce
BlackRock Inc history 6.83M $6.19M 0.00% Add
Royce & Associates history 294.76K $5.95M 0.05% Reduce
Two Sigma Investments history 248.12K $5.01M 0.00% Add
BNY Mellon history 532.34K $4.96M 0.00% Reduce
AQR Capital Management history 208.65K $4.21M 0.00% Add
Principal Global Investors history 204.25K $4.12M 0.00% Reduce
Invesco Ltd history 158.06K $3.19M 0.00% Reduce
Bank of America Corp history 136.82K $2.76M 0.00% Reduce
Arrowstreet Capital history 116.65K $2.35M 0.00% Reduce
PSP Investments history 116.65K $2.35M 0.01% Reduce
Legal & General Investment Management America history 78.28K $1.58M 0.00% Reduce
JPMorgan Chase & Co history 57.56K $1.19M 0.00% New
Citigroup Inc history 55.78K $1.13M 0.00% Add
Point72 Asset Management history 54.96K $1.11M 0.00% New
Morgan Stanley history 890.00K $807.67K 0.00% Reduce
Citadel Advisors history 37.63K $759.39K 0.00% Reduce
Deutsche Bank AG history 35.31K $712.50K 0.00% Add
Prudential Financial history 35.13K $708.98K 0.00% Reduce
Millennium Management history 31.81K $642.01K 0.00% Reduce
Fidelity Management & Research (FMR) history 28.96K $584.36K 0.00% Add
Franklin Resources history 24.99K $504.22K 0.00% Reduce
Manulife Financial history 14.25K $287.50K 0.00% Reduce
CPP Investments history 11.50K $232.07K 0.00% Reduce
PNC Financial Services history 5.00K $100.98K 0.00% Reduce
Wells Fargo & Co history 4.00K $3.63K 0.00% Hold
T. Rowe Price Associates history 51.10K $1.03K 0.00% Add

Q1 2026 — 33 funds

FundSharesValuePortfolio WeightChange
Marshall Wace history 1.03M $20.09M 0.02% Reduce
Geode Capital Management history 976.65K $19.14M 0.00% Add
D. E. Shaw & Co history 665.54K $13.04M 0.01% Add
Invesco Ltd history 604.77K $11.85M 0.00% Add
Renaissance Technologies history 553.90K $10.85M 0.02% Add
UBS Group AG history 420.26K $8.23M 0.00% Add
Royce & Associates history 406.18K $7.96M 0.08% Add
Northern Trust Corp history 372.28K $7.29M 0.00% Hold
Millennium Management history 371.37K $7.28M 0.00% Add
Arrowstreet Capital history 325.29K $6.37M 0.00% Reduce
Charles Schwab Investment Management history 321.04K $6.29M 0.00% Reduce
Morgan Stanley history 6.60M $5.96M 0.00% Reduce
BNY Mellon history 543.23K $5.04M 0.00% Reduce
BlackRock Inc history 5.53M $4.99M 0.00% Add
Principal Global Investors history 209.13K $4.10M 0.00% Reduce
Bank of America Corp history 174.32K $3.41M 0.00% Add
Franklin Resources history 139.31K $2.73M 0.00% Add
Two Sigma Investments history 138.15K $2.71M 0.00% Add
PSP Investments history 126.57K $2.48M 0.01% Add
Citadel Advisors history 85.44K $1.67M 0.00% Reduce
Legal & General Investment Management America history 80.92K $1.59M 0.00% Reduce
AQR Capital Management history 78.78K $1.54M 0.00% Add
Prudential Financial history 50.69K $993.08K 0.00% Add
Citigroup Inc history 35.90K $703.36K 0.00% Reduce
Deutsche Bank AG history 33.13K $649.04K 0.00% Add
Janus Henderson Group history 16.87K $330.70K 0.00% Hold
CPP Investments history 16.30K $319.32K 0.00% Reduce
Manulife Financial history 15.88K $311.07K 0.00% Reduce
PNC Financial Services history 5.45K $106.75K 0.00% Reduce
Fidelity Management & Research (FMR) history 1.29K $25.35K 0.00% Reduce
Goldman Sachs Group history 16.00K $14.46K 0.00% Hold
Wells Fargo & Co history 4.00K $3.63K 0.00% Hold
T. Rowe Price Associates history 44.90K $880 0.00% Add

Q4 2025 — 37 funds

FundSharesValuePortfolio WeightChange
Vanguard Group history 2.61M $69.85M 0.00% Reduce
Marshall Wace history 1.24M $33.13M 0.03% Add
Geode Capital Management history 886.83K $23.75M 0.00% Reduce
Arrowstreet Capital history 559.43K $14.98M 0.01% Add
D. E. Shaw & Co history 557.07K $14.92M 0.01% Add
Renaissance Technologies history 544.70K $14.59M 0.02% Reduce
Invesco Ltd history 501.40K $13.43M 0.00% Add
Northern Trust Corp history 371.39K $9.95M 0.00% Reduce
Royce & Associates history 352.30K $9.43M 0.10% Reduce
Charles Schwab Investment Management history 350.71K $9.39M 0.00% Reduce
Morgan Stanley history 9.25M $8.53M 0.00% Add
Millennium Management history 290.67K $7.78M 0.00% Reduce
BNY Mellon history 559.06K $7.22M 0.00% Reduce
UBS Group AG history 256.62K $6.87M 0.00% Reduce
Citadel Advisors history 241.02K $6.45M 0.00% Reduce
Principal Global Investors history 217.97K $5.84M 0.00% Add
BlackRock Inc history 4.35M $4.01M 0.00% Add
Bank of America Corp history 128.17K $3.43M 0.00% Add
PSP Investments history 122.50K $3.28M 0.01% Reduce
Two Sigma Investments history 98.68K $2.64M 0.00% Hold
Legal & General Investment Management America history 90.73K $2.43M 0.00% Reduce
Balyasny Asset Management history 77.47K $2.07M 0.00% Reduce
AQR Capital Management history 67.65K $1.81M 0.00% Add
Prudential Financial history 47.20K $1.26M 0.00% Hold
JPMorgan Chase & Co history 1.23M $1.14M 0.00% Reduce
CPP Investments history 29.80K $798.04K 0.00% Add
Deutsche Bank AG history 29.56K $791.54K 0.00% Add
Citigroup Inc history 767.00K $707.25K 0.00% Add
Franklin Resources history 26.05K $697.48K 0.00% Add
Janus Henderson Group history 16.87K $451.81K 0.00% Hold
Manulife Financial history 16.40K $439.25K 0.00% Reduce
PNC Financial Services history 5.81K $155.54K 0.00% Add
Fidelity Management & Research (FMR) history 3.52K $94.34K 0.00% Reduce
Lazard Asset Management history 2.47M $22.92K 0.00% Add
Goldman Sachs Group history 16.00K $14.75K 0.00% Hold
Wells Fargo & Co history 4.00K $3.70K 0.00% Reduce
T. Rowe Price Associates history 36.80K $986 0.00% Reduce

Q3 2025 — 38 funds

FundSharesValuePortfolio WeightChange
Vanguard Group history 2.63M $70.12M 0.00% Reduce
Geode Capital Management history 922.58K $24.59M 0.00% Reduce
Marshall Wace history 874.07K $23.29M 0.02% Add
Millennium Management history 697.76K $18.60M 0.01% Add
Renaissance Technologies history 586.90K $15.64M 0.02% Add
D. E. Shaw & Co history 517.22K $13.78M 0.01% Add
Northern Trust Corp history 399.47K $10.65M 0.00% Reduce
Arrowstreet Capital history 392.31K $10.46M 0.01% Add
Invesco Ltd history 389.59K $10.38M 0.00% Add
Royce & Associates history 366.32K $9.76M 0.10% Add
Charles Schwab Investment Management history 356.41K $9.50M 0.00% Add
UBS Group AG history 312.27K $8.32M 0.00% Add
Morgan Stanley history 8.76M $7.94M 0.00% Add
BNY Mellon history 567.83K $7.41M 0.00% Reduce
Citadel Advisors history 253.78K $6.76M 0.00% Reduce
Principal Global Investors history 205.68K $5.48M 0.00% Reduce
Balyasny Asset Management history 141.85K $3.78M 0.01% Reduce
PSP Investments history 139.68K $3.72M 0.01% Add
Bank of America Corp history 127.10K $3.39M 0.00% Reduce
BlackRock Inc history 3.45M $3.13M 0.00% Add
Two Sigma Investments history 98.68K $2.63M 0.00% Add
Legal & General Investment Management America history 97.61K $2.60M 0.00% Reduce
AQR Capital Management history 62.15K $1.66M 0.00% Reduce
JPMorgan Chase & Co history 1.71M $1.55M 0.00% Add
Prudential Financial history 47.43K $1.26M 0.00% Add
Wells Fargo & Co history 28.75K $766.21K 0.00% Add
Deutsche Bank AG history 28.40K $756.75K 0.00% Add
CPP Investments history 20.70K $551.65K 0.00% Add
Citigroup Inc history 19.82K $528.07K 0.00% Reduce
Manulife Financial history 17.76K $473.36K 0.00% Reduce
Wellington Management Group history 17.20K $458.35K 0.00% Add
Janus Henderson Group history 16.87K $449.45K 0.00% Hold
Franklin Resources history 9.53K $253.84K 0.00% New
Fidelity Management & Research (FMR) history 6.47K $172.49K 0.00% Reduce
PNC Financial Services history 5.53K $147.40K 0.00% Reduce
Goldman Sachs Group history 16.00K $14.50K 0.00% Reduce
Lazard Asset Management history 943.00K $8.59K 0.00% Add
T. Rowe Price Associates history 275.22K $7.34K 0.00% Add

Q2 2025 — 37 funds

FundSharesValuePortfolio WeightChange
Vanguard Group history 2.69M $61.69M 0.00% Add
Geode Capital Management history 973.24K $22.35M 0.00% Add
Marshall Wace history 848.68K $19.49M 0.02% Reduce
Millennium Management history 618.98K $14.21M 0.01% Reduce
Renaissance Technologies history 576.50K $13.24M 0.02% Add
Northern Trust Corp history 421.14K $9.67M 0.00% Reduce
Invesco Ltd history 386.97K $8.88M 0.00% Add
Charles Schwab Investment Management history 346.78K $7.96M 0.00% Add
BNY Mellon history 614.80K $7.49M 0.00% Add
Citadel Advisors history 322.94K $7.41M 0.00% Add
Morgan Stanley history 8.00M $6.90M 0.00% Hold
D. E. Shaw & Co history 293.93K $6.75M 0.01% Add
Royce & Associates history 283.19K $6.50M 0.07% Add
Balyasny Asset Management history 266.31K $6.11M 0.01% Add
Principal Global Investors history 219.04K $5.03M 0.00% Add
Bank of America Corp history 145.12K $3.33M 0.00% Add
BlackRock Inc history 3.35M $2.89M 0.00% Reduce
PSP Investments history 125.36K $2.88M 0.01% Add
Legal & General Investment Management America history 101.15K $2.32M 0.00% Hold
Arrowstreet Capital history 81.24K $1.87M 0.00% New
Two Sigma Investments history 80.13K $1.84M 0.00% Add
Prudential Financial history 41.95K $1.75M 0.00% Add
AQR Capital Management history 75.84K $1.74M 0.00% Add
UBS Group AG history 66.83K $1.53M 0.00% Reduce
JPMorgan Chase & Co history 1.63M $1.42M 0.00% Add
Deutsche Bank AG history 25.18K $578.09K 0.00% Reduce
Wells Fargo & Co history 24.40K $560.14K 0.00% Reduce
Goldman Sachs Group history 516.00K $445.09K 0.00% Add
Manulife Financial history 18.69K $429.08K 0.00% Reduce
Janus Henderson Group history 16.87K $387.37K 0.00% Reduce
Wellington Management Group history 15.62K $358.59K 0.00% Reduce
Fidelity Management & Research (FMR) history 7.20K $165.38K 0.00% Add
PNC Financial Services history 6.48K $148.85K 0.00% Add
CPP Investments history 4.20K $96.43K 0.00% Add
Citigroup Inc history 64.00K $55.20K 0.00% Reduce
T. Rowe Price Associates history 273.29K $6.28K 0.00% Reduce
Lazard Asset Management history 6.34K $145 0.00% New

Q1 2025 — 37 funds

FundSharesValuePortfolio WeightChange
Vanguard Group history 2.42M $70.24M 0.00% Reduce
Marshall Wace history 1.03M $29.91M 0.04% Add
Geode Capital Management history 955.08K $27.69M 0.00% Add
Millennium Management history 868.55K $25.18M 0.01% Add
Northern Trust Corp history 594.44K $17.23M 0.00% Reduce
Renaissance Technologies history 495.00K $14.35M 0.02% Reduce
Goldman Sachs Group history 406.71K $11.79M 0.00% Reduce
Invesco Ltd history 359.14K $10.41M 0.00% Reduce
Charles Schwab Investment Management history 326.23K $9.46M 0.00% Reduce
BNY Mellon history 566.08K $7.98M 0.00% Reduce
Royce & Associates history 247.86K $7.19M 0.08% Add
Morgan Stanley history 8.00M $7.09M 0.00% Add
Principal Global Investors history 212.65K $6.16M 0.00% Add
Citadel Advisors history 188.38K $5.46M 0.00% Reduce
Balyasny Asset Management history 162.14K $4.70M 0.01% New
Janus Henderson Group history 124.40K $3.54M 0.00% Reduce
PSP Investments history 118.89K $3.45M 0.01% Add
BlackRock Inc history 3.42M $3.04M 0.00% Hold
Legal & General Investment Management America history 101.58K $2.94M 0.00% Reduce
UBS Group AG history 89.32K $2.59M 0.00% Reduce
Citigroup Inc history 77.74K $2.25M 0.00% Add
Two Sigma Investments history 75.33K $2.18M 0.01% Reduce
Prudential Financial history 37.61K $1.67M 0.00% Reduce
AQR Capital Management history 53.64K $1.55M 0.00% Add
Deutsche Bank AG history 30.91K $896.08K 0.00% Reduce
Wells Fargo & Co history 29.36K $851.18K 0.00% Add
D. E. Shaw & Co history 29.19K $846.16K 0.00% Reduce
Franklin Resources history 20.26K $587.34K 0.00% Reduce
Manulife Financial history 19.83K $574.76K 0.00% Reduce
Wellington Management Group history 16.91K $490.31K 0.00% Reduce
Amundi US history 14.93K $406.56K 0.00% Reduce
Fidelity Management & Research (FMR) history 4.81K $139.32K 0.00% Reduce
PNC Financial Services history 4.78K $138.66K 0.00% Add
CPP Investments history 2.70K $78.27K 0.00% Add
JPMorgan Chase & Co history 39.00K $34.67K 0.00% Reduce
T. Rowe Price Associates history 541.22K $15.69K 0.00% Reduce
Bank of America Corp history 4.00K $3.55K 0.00% Hold

View all 40 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023Q2 2023Q1 2023Q4 2022Q3 2022Q2 2022Q1 2022Q4 2021Q3 2021
Marshall Wace 1.07M 1.03M 1.24M 874.07K 848.68K 1.03M 608.71K 568.49K 227.13K — — — — 64.21K — 31.64K 28.44K 17.42K — —
Geode Capital Management 969.84K 976.65K 886.83K 922.58K 973.24K 955.08K 916.08K 920.36K 906.35K 866.03K 846.65K 809.63K 780.26K 759.98K 722.28K 708.21K 692.39K 703.48K 714.87K 703.91K
D. E. Shaw & Co 887.05K 665.54K 557.07K 517.22K 293.93K 29.19K 118.85K 23.66K — — 77.08K 100.17K 123.60K 137.31K 57.95K 57.88K 61.73K 65.14K 26.77K —
Renaissance Technologies 525.10K 553.90K 544.70K 586.90K 576.50K 495.00K 525.50K 489.40K 537.70K 599.10K 641.90K 603.10K 492.58K 496.80K 447.40K 433.80K 406.90K 308.70K 289.80K 275.70K
Goldman Sachs Group 505.36K 16.00K 16.00K 16.00K 516.00K 406.71K 427.83K 449.39K 153.61K 199.64K 110.98K 294.46K 284.57K 221.68K 267.27K 174.34K 329.84K 116.49K 588.82K 575.23K
UBS Group AG 393.11K 420.26K 256.62K 312.27K 66.83K 89.32K 153.74K 101.03K 122.68K 80.45K 71.09K 18.37K 14.85K 22.99K 17.07K 15.45K 27.54K 27.89K 13.42K 9.26K
Northern Trust Corp 370.99K 372.28K 371.39K 399.47K 421.14K 594.44K 613.17K 583.36K 564.12K 560.78K 575.42K 559.42K 635.44K 649.23K 437.95K 415.12K 415.14K 404.14K 421.95K 423.38K
Charles Schwab Investment Management 310.18K 321.04K 350.71K 356.41K 346.78K 326.23K 347.51K 350.06K 359.22K 356.40K 379.48K 352.38K 328.26K 329.91K 326.79K 307.29K 314.79K 268.40K 260.94K 252.77K
BlackRock Inc 6.83M 5.53M 4.35M 3.45M 3.35M 3.42M 3.42M 2.98M — — — — — — — — — — — —
Royce & Associates 294.76K 406.18K 352.30K 366.32K 283.19K 247.86K 8.90K 9.08K 9.08K — — — — 22.32K — — 13.55K 20.90K 20.01K —
Two Sigma Investments 248.12K 138.15K 98.68K 98.68K 80.13K 75.33K 98.18K 98.80K 96.43K 96.80K 41.77K 95.48K 30.01K — — — 21.20K — — —
BNY Mellon 532.34K 543.23K 559.06K 567.83K 614.80K 566.08K 585.86K 553.75K 289.95K 294.48K 313.34K 326.51K 342.12K 347.21K 346.02K 362.88K 365.85K 401.40K 370.94K 364.00K
AQR Capital Management 208.65K 78.78K 67.65K 62.15K 75.84K 53.64K 29.47K 41.67K 55.80K 57.05K 12.74K 28.99K 59.04K 110.89K 112.60K 94.75K 35.29K 13.50K 10.57K 19.28K
Principal Global Investors 204.25K 209.13K 217.97K 205.68K 219.04K 212.65K 207.98K 202.02K 218.17K 218.57K 202.95K 210.04K 228.76K 232.74K 238.95K 244.74K 256.54K 266.90K 280.94K 252.17K
Invesco Ltd 158.06K 604.77K 501.40K 389.59K 386.97K 359.14K 2.50M 3.50M 450.93K 403.04K 400.89K 410.63K 560.67K 592.77K 645.96K 587.94K 510.05K 733.84K 696.89K 714.32K
Bank of America Corp 136.82K 174.32K 128.17K 127.10K 145.12K 4.00K 4.00K 386.00K 155.27K 125.38K 215.53K 134.83K 128.31K 290.74K 65.01K 88.77K 83.91K 61.23K 56.33K 56.77K
Arrowstreet Capital 116.65K 325.29K 559.43K 392.31K 81.24K — — — — 22.54K — 28.23K 29.10K 74.27K 166.04K 201.06K 304.67K 391.58K 416.05K 198.47K
PSP Investments 116.65K 126.57K 122.50K 139.68K 125.36K 118.89K 93.43K 80.59K 83.89K 76.59K 77.54K 47.10K 66.84K 66.30K 68.58K 70.08K 69.60K 68.77K 74.95K 92.09K
Legal & General Investment Management America 78.28K 80.92K 90.73K 97.61K 101.15K 101.58K 103.74K 107.61K 109.14K 107.33K 107.09K 106.95K 109.42K 94.76K 92.59K 91.44K 89.23K 87.19K 87.88K 85.27K
JPMorgan Chase & Co 57.56K — 1.23M 1.71M 1.63M 39.00K 153.57K 465.00K 71.57K 140.45K 74.22K 80.55K 83.85K 69.97K 113.75K 219.68K 217.16K 88.47K 110.52K 173.69K

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