AMPHASTAR PHARMACEUTICALS IN
CUSIP 03209RAB9
Amphastar Pharmaceuticals In has 36 institutional holders in Filings Flow’s 13F database, together reporting 340.37M shares worth $308M as of Q1 2026. The largest reported holders are Linden Advisors LP, Context Capital Management, LLC, and Camden Asset Management L P /Ca.
Institutional Holders
36
Q1 2026
Reported Value
$308M
Ticker
unmapped
private placement or foreign
Quarters Tracked
3
Ownership Trend
Institutional holders
Total reported value
Holders
Mixed quarters
| Manager | % of Portfolio | Value | Shares | Quarter |
|---|---|---|---|---|
| Wellesley Asset Management$953M AUM | 2.48% | $24M | 26.03M | Q1 2026OLDER |
| Context Capital Management, LLC$4.3B AUM | 1.40% | $61M | 66.93M | Q1 2026OLDER |
| CAMDEN ASSET MANAGEMENT L P /CA$2.9B AUM | 1.28% | $38M | 41.83M | Q1 2026OLDER |
| SILVERBACK ASSET MANAGEMENT LLC$699M AUM | 0.66% | $5M | 5.08M | Q1 2026OLDER |
| Pinnacle Holdings, LLC$309M AUM | 0.60% | $2M | 2.06M | Q1 2026OLDER |
| Empyrean Capital Partners, LP$3.1B AUM | 0.59% | $18M | 20.27M | Q1 2026OLDER |
| OAKTREE CAPITAL MANAGEMENT LP$6.6B AUM | 0.53% | $34M | 38.04M | Q1 2026OLDER |
| LINDEN ADVISORS LP$17.9B AUM | 0.47% | $85M | 93.57M | Q1 2026OLDER |
| MACKAY SHIELDS LLC$2.7B AUM | 0.28% | $8M | 8.73M | Q4 2025OLDER |
| TENOR CAPITAL MANAGEMENT Co., L.P.$6.5B AUM | 0.20% | $14M | 15.00M | Q4 2025OLDER |
| KIM, LLC$976M AUM | 0.19% | $2M | 2.50M | Q4 2025OLDER |
| ADVENT CAPITAL MANAGEMENT /DE/$3.6B AUM | 0.10% | $4M | 4.05M | Q1 2026OLDER |
| Ares Systematic Credit Ltd$123M AUM | 0.08% | $93,299 | 100.0K | Q1 2026OLDER |
| PALISADE CAPITAL MANAGEMENT, LP$3.0B AUM | 0.07% | $2M | 2.42M | Q4 2025OLDER |
| Financial Sense Advisors, Inc.$493M AUM | 0.04% | $198,966 | 220.0K | Q1 2026OLDER |
| Calamos Advisors LLC$28.2B AUM | 0.03% | $9M | 10.00M | Q1 2026OLDER |
| SSI INVESTMENT MANAGEMENT LLC$1.4B AUM | 0.02% | $323,455 | 358.0K | Q1 2026OLDER |
| CSS LLC/IL$2.1B AUM | 0.02% | $460,469 | 510.0K | Q1 2026OLDER |
| Russell Investments Group, Ltd.$93.1B AUM | 0.01% | $5M | 5.68M | Q1 2026OLDER |
| Balboa Wealth Partners$596M AUM | 0.00% | $12,616 | 14.0K | Q3 2025OLDER |
| Universal- Beteiligungs- und Servicegesellschaft mbH$58.1B AUM | 0.00% | $1M | 1.20M | Q1 2026OLDER |
| Jefferies Financial Group Inc.$14.6B AUM | 0.00% | $294,033 | 318.0K | Q4 2025OLDER |
| CITIGROUP INC$234.5B AUM | 0.00% | $3M | 3.50M | Q1 2026OLDER |
| Capital Investment Advisory Services, LLC$1.4B AUM | 0.00% | $14,456 | 16.0K | Q1 2026OLDER |
| NOMURA HOLDINGS INC$37.7B AUM | 0.00% | $609,622 | 22.9K | Q3 2025OLDER |
| OPPENHEIMER ASSET MANAGEMENT INC.$8.8B AUM | 0.00% | $77,044 | 85.0K | Q3 2025OLDER |
| INSIGNEO ADVISORY SERVICES, LLC$1.4B AUM | 0.00% | $10,842 | 12.0K | Q1 2026OLDER |
| TRUIST FINANCIAL CORP$74.2B AUM | 0.00% | $463,170 | 511.0K | Q3 2025OLDER |
| MORGAN STANLEY$1.67T AUM | 0.00% | $9M | 9.25M | Q1 2026OLDER |
| Zurcher Kantonalbank (Zurich Cantonalbank)$46.0B AUM | 0.00% | $230,938 | 250.0K | Q4 2025OLDER |
| CHOREO, LLC$8.1B AUM | 0.00% | $33,464 | 37.0K | Q1 2026OLDER |
| STEPHENS INC /AR/$8.0B AUM | 0.00% | $23,566 | 26.0K | Q3 2025OLDER |
| FMR LLC$1.90T AUM | 0.00% | $3M | 3.80M | Q1 2026OLDER |
| ROYAL BANK OF CANADA$570.1B AUM | 0.00% | $1M | 1.13M | Q1 2026OLDER |
| SEI INVESTMENTS CO$108.4B AUM | 0.00% | $128,172 | 139.0K | Q4 2025OLDER |
| Cetera Investment Advisers$94.0B AUM | 0.00% | $100,289 | 111.0K | Q1 2026OLDER |
| BlackRock, Inc.$5.72T AUM | 0.00% | $5M | 5.53M | Q1 2026OLDER |
| BARCLAYS PLC$416.3B AUM | 0.00% | $211,413 | 233.0K | Q1 2026OLDER |
| Bank of New York Mellon Corp$543.9B AUM | 0.00% | $272,205 | 300.0K | Q1 2026OLDER |
| COMERICA BANK$25.1B AUM | 0.00% | $10,143 | 11.0K | Q4 2025OLDER |
| LAZARD ASSET MANAGEMENT LLC$60.8B AUM | 0.00% | $22,918 | 2.47M | Q4 2025OLDER |
| JPMORGAN CHASE & CO$1.56T AUM | 0.00% | $413,068 | 456.0K | Q1 2026OLDER |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC$49.1B AUM | 0.00% | $9,056 | 10.0K | Q1 2026OLDER |
| Steward Partners Investment Advisory, LLC$19.6B AUM | 0.00% | $3,614 | 4.0K | Q1 2026OLDER |
| FIFTH THIRD BANCORP$54.7B AUM | 0.00% | $9,939 | 11.0K | Q1 2026OLDER |
| JANE STREET GROUP, LLC$777.2B AUM | 0.00% | $91,062 | 100.0K | Q3 2025OLDER |
| RAYMOND JAMES FINANCIAL INC$324.4B AUM | 0.00% | $26,202 | 29.0K | Q1 2026OLDER |
| OSAIC HOLDINGS, INC.$68.3B AUM | 0.00% | $5,421 | 6 | Q1 2026OLDER |
| GOLDMAN SACHS GROUP INC$870.9B AUM | 0.00% | $14,456 | 16.0K | Q1 2026OLDER |
| WELLS FARGO & COMPANY/MN$530.3B AUM | 0.00% | $3,629 | 4.0K | Q2 2026 |
| Erste Asset Management GmbH$10.8B AUM | — | $0 | 0 | Q1 2026OLDER |
Holdings are reported up to 45 days after quarter end. Share counts are as filed and not adjusted for stock splits.