Who owns Bio-Rad Laboratories (BIO)
Which tracked institutional funds hold BIO, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BIO company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
100 tracked funds added or opened BIO while 77 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
BIO’s largest tracked holder by dollar value, First Eagle Investment Management, LLC, sizes it at 1.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in BIO 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 2026-Q1 and 2026-Q2, across 367 tracked filers holding BIO, 169 increased or opened the position and 225 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 BIO between the 2026-Q1 and 2026-Q2 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 23
- WELLINGTON MANAGEMENT GROUP LLP$18M
- BANK OF NOVA SCOTIA$12M
- Palliser Capital (UK) Ltd$8M
- Concentric Capital Strategies, LP$7M
- AYAL Capital Advisors Ltd$5M
- Longaeva Partners L.P.$4M
Full exits 40
- PARNASSUS INVESTMENTS, LLC$71M
- THOMPSON SIEGEL & WALMSLEY LLC$49M
- GW&K Investment Management, LLC$49M
- SOUTHEASTERN ASSET MANAGEMENT INC/TN/$45M
- CIBC Bancorp USA Inc.$33M
- ACADIAN ASSET MANAGEMENT LLC$29M
Largest adds
- BlackRock, Inc.$83M
- First Eagle Investment Management, LLC$40M
- GOLDMAN SACHS GROUP INC$38M
- NOMURA HOLDINGS INC$36M
- NEUBERGER BERMAN GROUP LLC$32M
- VICTORY CAPITAL MANAGEMENT INC$31M
Largest trims
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$108M
- Mawer Investment Management Ltd.$32M
- FEDERATED HERMES, INC.$29M
- DIMENSIONAL FUND ADVISORS LP$26M
- CITADEL ADVISORS LLC$22M
- Hound Partners, LLC$21M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| First Eagle Investment Management, LLC added | 2,606,219 | $765M | 14.3% | 2026-Q2 |
| BlackRock, Inc. added | 1,698,929 | $499M | 9.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 944,548 | $277M | 5.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 826,972 | $243M | 4.6% | 2026-Q2 |
| ARIEL INVESTMENTS, LLC added | 816,751 | $240M | 4.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 816,198 | $240M | 4.5% | 2026-Q2 |
| EARNEST PARTNERS LLC trimmed | 580,752 | $171M | 3.2% | 2026-Q2 |
| STATE STREET CORP added | 571,762 | $168M | 3.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 490,412 | $144M | 2.7% | 2026-Q2 |
| Capital World Investors added | 462,457 | $136M | 2.5% | 2026-Q2 |
| Capital Research Global Investors added | 443,483 | $130M | 2.4% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 418,884 | $123M | 2.3% | 2026-Q2 |
| First Pacific Advisors, LP trimmed | 401,861 | $118M | 2.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 347,575 | $102M | 1.9% | 2026-Q2 |
| NOMURA HOLDINGS INC added | 328,897 | $97M | 1.8% | 2026-Q2 |
| UBS Group AG trimmed | 308,325 | $91M | 1.7% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 273,377 | $80M | 1.5% | 2026-Q2 |
| BARCLAYS PLC trimmed | 267,634 | $79M | 1.5% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 233,227 | $68M | 1.3% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 226,070 | $66M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 218,285 | $64M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 195,538 | $57M | 1.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 193,682 | $57M | 1.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 192,711 | $56M | 1.1% | 2026-Q2 |
| MORGAN STANLEY trimmed | 190,285 | $56M | 1.0% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 181,225 | $53M | 1.0% | 2026-Q2 |
| Gotham Asset Management, LLC added | 166,262 | $49M | 0.9% | 2026-Q2 |
| Freestone Grove Partners LP trimmed | 140,113 | $41M | 0.8% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC added | 127,191 | $37M | 0.7% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 122,126 | $36M | 0.7% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 116,909 | $34M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 114,403 | $34M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 113,854 | $33M | 0.6% | 2026-Q2 |
| ING GROEP NV added | 112,700 | $33M | 0.6% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 111,812 | $33M | 0.6% | 2026-Q2 |
| NORGES BANK trimmed | 111,580 | $33M | 0.6% | 2026-Q2 |
| Boston Trust Walden Corp added | 111,167 | $33M | 0.6% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 105,449 | $31M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 102,605 | $31M | 0.6% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 101,580 | $30M | 0.6% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 97,500 | $29M | 0.5% | 2026-Q2 |
| Hosking Partners LLP added | 94,430 | $28M | 0.5% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 94,209 | $28M | 0.5% | 2026-Q2 |
| JNE Partners LLP trimmed | 88,511 | $26M | 0.5% | 2026-Q2 |
| Allianz Asset Management GmbH trimmed | 87,780 | $26M | 0.5% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 78,878 | $24M | 0.4% | 2026-Q2 |
| EXCHANGE TRADED CONCEPTS, LLC added | 72,116 | $21M | 0.4% | 2026-Q2 |
| Mawer Investment Management Ltd. trimmed | 71,577 | $21M | 0.4% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 69,598 | $21M | 0.4% | 2026-Q2 |
| Tikvah Management LLC trimmed | 68,604 | $20M | 0.4% | 2026-Q2 |
| QVIDTVM Management LLC trimmed | 66,243 | $19M | 0.4% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ trimmed | 65,000 | $19M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 60,819 | $18M | 0.3% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 60,249 | $18M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 59,895 | $18M | 0.3% | 2026-Q2 |
| Arnhold LLC added | 55,568 | $16M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 45,140 | $13M | 0.2% | 2026-Q2 |
| ASSETMARK, INC added | 44,277 | $13M | 0.2% | 2026-Q2 |
| Portolan Capital Management, LLC added | 42,620 | $13M | 0.2% | 2026-Q2 |
| Marathon Asset Management Ltd trimmed | 41,975 | $12M | 0.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 40,905 | $12M | 0.2% | 2026-Q2 |
| BANK OF NOVA SCOTIA added | 39,708 | $12M | 0.2% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 37,558 | $11M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 36,941 | $11M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 36,847 | $11M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 36,320 | $11M | 0.2% | 2026-Q2 |
| Invesco Ltd. trimmed | 36,283 | $11M | 0.2% | 2026-Q2 |
| SECTOR GAMMA AS added | 33,350 | $10M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 30,004 | $9M | 0.2% | 2026-Q2 |
| Nuveen, LLC added | 29,493 | $9M | 0.2% | 2026-Q2 |
| Palliser Capital (UK) Ltd new | 27,954 | $8M | 0.2% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL | 26,750 | $8M | 0.1% | 2026-Q2 |
| GABELLI FUNDS LLC trimmed | 25,900 | $8M | 0.1% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 25,000 | $7M | 0.1% | 2026-Q2 |
| Concentric Capital Strategies, LP new | 23,692 | $7M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 22,502 | $6M | 0.1% | 2026-Q2 |
| Hound Partners, LLC trimmed | 22,481 | $7M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 20,766 | $6M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 19,287 | $6M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 19,256 | $6M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 18,980 | $6M | 0.1% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 18,628 | $5M | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 18,205 | $5M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 17,841 | $5M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 17,582 | $5M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 17,435 | $5M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 16,649 | $5M | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 16,448 | $5M | 0.1% | 2026-Q2 |
| AYAL Capital Advisors Ltd trimmed | 16,333 | $5M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 15,663 | $5M | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 15,011 | $4M | 0.1% | 2026-Q2 |
| Longaeva Partners L.P. new | 14,639 | $4M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 14,205 | $4M | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 14,068 | $4M | 0.1% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC trimmed | 14,056 | $4M | 0.1% | 2026-Q2 |
| PFM Health Sciences, LP new | 13,995 | $4M | 0.1% | 2026-Q2 |
| CAXTON ASSOCIATES LLP added | 13,875 | $4M | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 13,718 | $4M | 0.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 13,664 | $4M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 13,304 | $4M | 0.1% | 2026-Q2 |
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.