Who owns Hologic (HOLX)
Which tracked institutional funds hold HOLX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See HOLX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
182 tracked funds added or opened HOLX while 171 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
HOLX’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.1pp gap the other way — the median holder sizes HOLX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in HOLX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 708 tracked filers holding HOLX, 340 increased or opened the position and 366 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in HOLX between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 42
- VANGUARD CAPITAL MANAGEMENT LLC$1.1B
- VANGUARD PORTFOLIO MANAGEMENT LLC$727M
- O'Connor Alternative Investments LLC$236M
- VANGUARD FIDUCIARY TRUST CO$95M
- Weiss Asset Management LP$93M
- Kryger Capital LLC$62M
Full exits 62
- VANGUARD GROUP INC$1.9B
- T. Rowe Price Investment Management, Inc.$287M
- OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC)$194M
- RENAISSANCE TECHNOLOGIES LLC$99M
- KRYGER CAPITAL Ltd$54M
- JANUS HENDERSON GROUP PLC$38M
Largest adds
- GLAZER CAPITAL, LLC$242M
- BALYASNY ASSET MANAGEMENT L.P.$237M
- FIL Ltd$202M
- MILLENNIUM MANAGEMENT LLC$166M
- UBS Group AG$151M
- HBK INVESTMENTS L P$115M
Largest trims
- MANUFACTURERS LIFE INSURANCE COMPANY, THE$695M
- VICTORY CAPITAL MANAGEMENT INC$413M
- BlackRock, Inc.$314M
- NORGES BANK$181M
- DIMENSIONAL FUND ADVISORS LP$141M
- JPMORGAN CHASE & CO$63M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 17,627,598 | $1.3B | 8.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 14,503,914 | $1.1B | 6.6% | 2026-Q1 |
| STATE STREET CORP added | 9,990,906 | $755M | 4.6% | 2026-Q1 |
| HBK INVESTMENTS L P added | 9,800,000 | $741M | 4.5% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 9,620,600 | $727M | 4.4% | 2026-Q1 |
| FIL Ltd added | 7,821,581 | $591M | 3.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 6,058,845 | $456M | 2.8% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 5,651,225 | $427M | 2.6% | 2026-Q1 |
| UBS Group AG added | 5,089,745 | $385M | 2.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 4,722,968 | $357M | 2.2% | 2026-Q1 |
| Pentwater Capital Management LP added | 4,500,224 | $340M | 2.1% | 2026-Q1 |
| MORGAN STANLEY added | 3,573,011 | $270M | 1.6% | 2026-Q1 |
| GLAZER CAPITAL, LLC added | 3,563,652 | $269M | 1.6% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 3,131,196 | $237M | 1.4% | 2026-Q1 |
| O'Connor Alternative Investments LLC new | 3,118,178 | $236M | 1.4% | 2026-Q1 |
| Invesco Ltd. trimmed | 3,098,012 | $234M | 1.4% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 2,921,130 | $221M | 1.3% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 2,676,190 | $202M | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 2,322,673 | $176M | 1.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 2,299,022 | $174M | 1.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 2,254,024 | $170M | 1.0% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 2,196,804 | $166M | 1.0% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 2,173,847 | $164M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,157,358 | $163M | 1.0% | 2026-Q1 |
| EARNEST PARTNERS LLC trimmed | 1,842,926 | $139M | 0.8% | 2026-Q1 |
| Davidson Kempner Capital Management LP added | 1,619,115 | $122M | 0.7% | 2026-Q1 |
| NEXPOINT ASSET MANAGEMENT, L.P. added | 1,541,860 | $117M | 0.7% | 2026-Q1 |
| SYQUANT CAPITAL SAS added | 1,523,025 | $115M | 0.7% | 2026-Q1 |
| DekaBank Deutsche Girozentrale | 1,475,379 | $113M | 0.7% | 2026-Q1 |
| Amundi added | 1,469,196 | $111M | 0.7% | 2026-Q1 |
| Legal & General Group Plc added | 1,413,564 | $107M | 0.6% | 2026-Q1 |
| NORGES BANK trimmed | 1,669,264 | $103M | 0.6% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 1,361,861 | $103M | 0.6% | 2026-Q1 |
| TIG Advisors, LLC added | 1,335,117 | $101M | 0.6% | 2026-Q1 |
| First Trust Capital Management L.P. added | 1,327,989 | $100M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,252,673 | $95M | 0.6% | 2026-Q1 |
| Weiss Asset Management LP new | 1,230,436 | $93M | 0.6% | 2026-Q1 |
| Absolute Gestao de Investimentos Ltda. added | 1,206,999 | $91M | 0.6% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 1,195,073 | $90M | 0.5% | 2026-Q1 |
| Squarepoint Ops LLC added | 1,152,092 | $87M | 0.5% | 2026-Q1 |
| BANK OF NOVA SCOTIA added | 1,143,287 | $86M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 1,136,595 | $86M | 0.5% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 1,090,660 | $82M | 0.5% | 2026-Q1 |
| AQR Arbitrage LLC added | 1,048,664 | $79M | 0.5% | 2026-Q1 |
| SOROS FUND MANAGEMENT LLC added | 1,013,552 | $77M | 0.5% | 2026-Q1 |
| Woodline Partners LP added | 1,009,039 | $76M | 0.5% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 1,018,319 | $76M | 0.5% | 2026-Q1 |
| SG Americas Securities, LLC added | 932,831 | $71M | 0.4% | 2026-Q1 |
| NATIONAL BANK OF CANADA /FI/ added | 864,725 | $65M | 0.4% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 858,013 | $65M | 0.4% | 2026-Q1 |
| Kryger Capital LLC new | 821,131 | $62M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 821,157 | $62M | 0.4% | 2026-Q1 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC added | 821,157 | $62M | 0.4% | 2026-Q1 |
| Man Group plc added | 761,747 | $58M | 0.3% | 2026-Q1 |
| BARCLAYS PLC added | 746,127 | $56M | 0.3% | 2026-Q1 |
| Alberta Investment Management Corp added | 734,000 | $55M | 0.3% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP trimmed | 676,423 | $51M | 0.3% | 2026-Q1 |
| Swiss National Bank added | 664,640 | $50M | 0.3% | 2026-Q1 |
| PICTON MAHONEY ASSET MANAGEMENT added | 650,514 | $49M | 0.3% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 644,333 | $49M | 0.3% | 2026-Q1 |
| Nuveen, LLC added | 631,881 | $48M | 0.3% | 2026-Q1 |
| ING GROEP NV added | 627,305 | $47M | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 618,084 | $47M | 0.3% | 2026-Q1 |
| Laurion Capital Management LP new | 604,506 | $46M | 0.3% | 2026-Q1 |
| LMR Partners LLP added | 598,714 | $45M | 0.3% | 2026-Q1 |
| STOREBRAND ASSET MANAGEMENT AS trimmed | 587,205 | $44M | 0.3% | 2026-Q1 |
| Polar Asset Management Partners Inc. added | 586,038 | $44M | 0.3% | 2026-Q1 |
| Quantinno Capital Management LP added | 580,740 | $44M | 0.3% | 2026-Q1 |
| Verition Fund Management LLC added | 578,395 | $44M | 0.3% | 2026-Q1 |
| TORONTO DOMINION BANK added | 567,153 | $43M | 0.3% | 2026-Q1 |
| WATER ISLAND CAPITAL LLC added | 560,045 | $42M | 0.3% | 2026-Q1 |
| MIZUHO SECURITIES USA LLC | 13,455 | $1M | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Louisiana State Employees Retirement System | 11,300 | $854K | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| PRIVATE TRUST CO NA | 102 | $8K | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| MV CAPITAL MANAGEMENT, INC. | 98 | $7K | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| IFP Advisors, Inc trimmed | 54 | $4K | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| YOUSIF CAPITAL MANAGEMENT, LLC | 29,868 | $299 | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| HUNTINGTON NATIONAL BANK trimmed | 1 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Sterling Capital Management LLC | 7,524 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| First Command Advisory Services, Inc. | 46 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| RHUMBLINE ADVISERS trimmed | 563,121 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Westside Investment Management, Inc. | 116 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| ZIONS BANCORPORATION, NATIONAL ASSOCIATION /UT/ | 64 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| GAMMA Investing LLC trimmed | 15,678 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| MassMutual Private Wealth & Trust, FSB trimmed | 1,718 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Salomon & Ludwin, LLC | 101 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Ancora Advisors LLC trimmed | 154 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| Sankala Group LLC | 81 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| PARADIGM ASSET MANAGEMENT CO LLC | 18,600 | — | 0.0% | 2026-Q2 (1 quarter ahead of as-of) |
| VANGUARD GROUP INC trimmed | 26,089,403 | $1.9B | 11.8% | 2025-Q4 stale (1 quarter behind) |
| T. Rowe Price Investment Management, Inc. trimmed | 3,853,062 | $287M | 1.7% | 2025-Q4 stale (1 quarter behind) |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) new | 2,605,031 | $194M | 1.2% | 2025-Q4 stale (1 quarter behind) |
| RENAISSANCE TECHNOLOGIES LLC added | 1,323,090 | $99M | 0.6% | 2025-Q4 stale (1 quarter behind) |
| KRYGER CAPITAL Ltd new | 727,335 | $54M | 0.3% | 2025-Q4 stale (1 quarter behind) |
| Black Creek Investment Management Inc. trimmed | 3,743,345 | $253M | 1.5% | 2025-Q3 stale (2 quarters behind) |
| Sound Shore Management Inc /CT/ trimmed | 1,337,653 | $90M | 0.5% | 2025-Q3 stale (2 quarters behind) |
| SHAPIRO CAPITAL MANAGEMENT LLC trimmed | 749,556 | $51M | 0.3% | 2025-Q3 stale (2 quarters behind) |
| Freestone Grove Partners LP added | 693,436 | $47M | 0.3% | 2025-Q3 stale (2 quarters behind) |
| Gotham Asset Management, LLC added | 639,921 | $43M | 0.3% | 2025-Q3 stale (2 quarters behind) |
| Longaeva Partners L.P. added | 614,934 | $42M | 0.3% | 2025-Q3 stale (2 quarters behind) |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.