Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
285 institutional managers reported holding ACHC for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 71%. 86 opened new positions; 49 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 11.69M | 12.86% | $273.3M | added +2.5% | ≤2013 |
| Vanguard Group | 9.94M | 10.94% | $232.3M | added +6.3% | ≤2013 |
| Wellington Management | 9.07M | 9.99% | $212.2M | trimmed -22.9% | ≤2013 |
| FMR (Fidelity) | 6.87M | 7.56% | $160.6M | added +26.8% | 2015 Q1 |
| Khrom Capital Management LLC (focused) | 5.19M | 5.72% | $121.5M | trimmed -29.3% | 2024 Q4 |
| Deerfield Management Company, L.p. | 4.52M | 4.97% | $105.7M | unchanged | 2025 Q3 |
| DME Capital Management, LP (focused) | 4.52M | 4.97% | $105.7M | added +9.6% | 2024 Q4 |
| Morgan Stanley | 4.49M | 4.94% | $105.0M | added +193.8% | ≤2013 |
| Abrams Bison Investments, LLC (focused) | 4.38M | 4.82% | $102.4M | unchanged | 2025 Q1 |
| Jefferies Financial Group INC. | 3.61M | 3.98% | $84.5M | added +6.9% | 2025 Q2 |
| State Street | 3.22M | 3.54% | $75.3M | trimmed -2.3% | ≤2013 |
| UBS | 3.11M | 3.42% | $72.7M | added +37.7% | ≤2013 |
| Citadel Advisors | 2.72M | 2.99% | $63.5M | added +100.4% | 2013 Q3 |
| Dimensional Fund Advisors | 2.58M | 2.84% | $60.4M | trimmed -7.3% | ≤2013 |
| MAK Capital ONE LLC (focused) | 2.43M | 2.68% | $56.9M | opened | 2026 Q1 |
| Citigroup INC | 2.35M | 2.59% | $55.0M | trimmed -8.6% | ≤2013 |
| Carronade Capital Management, LP (focused) | 2.34M | 2.57% | $54.7M | opened | 2026 Q1 |
| Goldman Sachs | 2.24M | 2.47% | $52.4M | trimmed -52.6% | ≤2013 |
| Neuberger Berman Group LLC | 1.96M | 2.16% | $45.9M | added +72.4% | ≤2013 |
| Charles Schwab Investment Management | 1.90M | 2.09% | $44.5M | added +33.5% | ≤2013 |
| Vaughan Nelson Investment Management, L.p. | 1.84M | 2.02% | $43.0M | opened | 2026 Q1 |
| P2 Capital Partners, LLC (focused) | 1.77M | 1.95% | $41.5M | opened | 2017 Q1 |
| Farallon Capital | 1.74M | 1.91% | $40.6M | opened | 2026 Q1 |
| First Trust Advisors LP | 1.69M | 1.86% | $39.5M | added +73% | 2020 Q2 |
| Geode Capital | 1.66M | 1.83% | $38.8M | added +1.7% | ≤2013 |
| Brown Advisory INC | 1.34M | 1.47% | $31.2M | added +102.3% | 2025 Q1 |
| Maverick Capital | 1.31M | 1.45% | $30.7M | added +45.1% | 2024 Q4 |
| Bank OF America CORP /DE/ | 1.23M | 1.35% | $28.8M | added +64.7% | ≤2013 |
| Invenomic Capital Management LP | 1.18M | 1.30% | $27.6M | trimmed -64.3% | 2025 Q1 |
| Deutsche Bank AG\ | 1.16M | 1.27% | $27.1M | added +35.1% | 2013 Q3 |
| Allianz Asset Management GmbH | 890.3k | 0.98% | $20.8M | added +129.4% | 2025 Q4 |
| Rubric Capital Management LP | 850.0k | 0.94% | $19.9M | unchanged | 2025 Q3 |
| Hawk Ridge Capital Management LP (focused) | 836.0k | 0.92% | $19.6M | trimmed -64.9% | 2024 Q4 |
| Man Group | 794.5k | 0.87% | $18.6M | opened | 2026 Q1 |
| Ameriprise Financial INC | 746.4k | 0.82% | $17.5M | trimmed -3% | ≤2013 |
| Susquehanna International Group | 742.9k | 0.82% | $17.4M | added +174.7% | 2020 Q3 |
| Northern Trust | 728.9k | 0.80% | $17.0M | added +14.1% | ≤2013 |
| Cibc Bancorp USA INC. | 690.5k | 0.76% | $16.1M | added +291262.9% | 2024 Q1 |
| Buckley Capital Advisors, LLC (focused) | 665.1k | 0.73% | $15.6M | opened | 2026 Q1 |
| Braidwell LP | 645.9k | 0.71% | $15.1M | opened | 2026 Q1 |
| Freestone Grove Partners LP | 636.1k | 0.70% | $14.9M | opened | 2026 Q1 |
| Palisade Capital Management, LP | 613.4k | 0.68% | $14.3M | trimmed -1.9% | 2017 Q2 |
| Invesco | 583.2k | 0.64% | $13.6M | trimmed -19.9% | ≤2013 |
| PFM Health Sciences, LP | 582.7k | 0.64% | $13.6M | opened | 2026 Q1 |
| Frontier Capital Management CO LLC | 575.2k | 0.63% | $13.5M | opened | 2016 Q4 |
| Principal Financial Group INC | 558.5k | 0.61% | $13.1M | added +27.4% | 2017 Q2 |
| Point72 | 536.5k | 0.59% | $12.5M | opened | 2026 Q1 |
| Amundi | 525.1k | 0.58% | $12.3M | added +2.9% | 2024 Q3 |
| Aristotle Capital Boston, LLC | 521.7k | 0.57% | $12.2M | trimmed -13.3% | 2016 Q4 |
| American Century Companies INC | 518.6k | 0.57% | $12.1M | added +185.4% | 2022 Q1 |
Largest 50 of 285 shown; the full ranked, searchable register is at boothcheck.com/holders/ACHC. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.