% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| First Eagle Investment Management, LLC | 714K | 1.6M | 2.5M | 2.5M | 2.6M | 2.6M | $726M |
| BlackRock, Inc. | 2.0M | 2.0M | 1.8M | 1.7M | 1.7M | 1.7M | $468M |
| DIMENSIONAL FUND ADVISORS LP | 746K | 877K | 1000K | 1.1M | 1.1M | 1.1M | $304M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 831K | $232M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | — | — | — | — | — | 829K | $231M |
| ARIEL INVESTMENTS, LLCtracked | 561K | 725K | 819K | 809K | 765K | 786K | $219M |
| EARNEST PARTNERS LLC | 618K | 600K | 606K | 609K | 604K | 589K | $164M |
| STATE STREET CORP | 690K | 695K | 584K | 572K | 560K | 560K | $156M |
| Capital World Investors | — | — | — | — | — | 450K | $125M |
| BANK OF AMERICA CORP /DE/ | 427K | 431K | 452K | 460K | 445K | 445K | $124M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 389K | 383K | 17K | 397K | 395K | 426K | $119M |
| First Pacific Advisors, LP | 158K | 373K | 387K | 394K | 401K | 407K | $114M |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 4K | 4K | 4K | 9K | 399K | 396K | $110M |
| Capital Research Global Investors | — | — | — | 418K | 494K | 386K | $107M |
| GEODE CAPITAL MANAGEMENT, LLC | 322K | 343K | 334K | 350K | 338K | 365K | $102M |
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
“Item 4 to the Schedule 13D is hereby amended, in pertinent part, as follows: The purpose of the Shareholders' ownership of Bio-Rad shares has been control of the Company. The Shareholders control the management of the Company and may be deemed to be "parents" of the Company as that term is defined in the Rules and Regulations of the Commission.”
“Item 4 to the Schedule 13D is hereby amended, in pertinent part, as follows: The purposes of the transactions on December 10, 2018, December 3, 2019, December 7, 2020, November 9, 2021, November 7, 2022, December 5, 2023 and August 26, 2024 for Alice N. Schwartz and for the Alice N. Schwartz Revocable Trust set forth in Item 5 were estate planning. The purpose of the Shareholders' ownership of Bio-Rad shares has been control of the Company. Mrs. Schwartz, along with other members of her family, ”
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | +831,165 | $232M | OPEN |
| VANGUARD PORTFOLIO MANAGEMENT LLC | +829,186 | $231M | OPEN |
| Capital World Investors | +450,000 | $125M | OPEN |
| BARCLAYS PLC | +254,341 | $71M | ADD |
| NOMURA HOLDINGS INC | +217,342 | $61M | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −1,774,263 | $495M | CLOSE |
| Veritas Asset Management LLP | −543,335 | $151M | CLOSE |
| FULLER & THALER ASSET MANAGEMENT, INC. | −519,154 | $145M | CLOSE |
| Boston Partners | −239,419 | $67M | TRIM |
| WESTFIELD CAPITAL MANAGEMENT CO LP | −165,107 | $46M | CLOSE |
The 2025-Q4 register is as-filed in ITS OWN share basis; every count below was rebased into the 2026-Q1 basis (no split in between, factor 1). Dollar figures value the SHARE delta at one price — the 2026-03-31 close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure.
13Fs disclose LONG US-listed positions only — shorts, most derivatives, bonds and non-US listings are invisible here, and a filer's quarter-over-quarter change is not necessarily a trade (index rebalances, in-kind transfers and entity successions all read as flow).
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 389 | 19,977,040 | — | $5.6B |
| 2025-Q4 | 396 | 19,733,752 | — | $6.0B |
| 2025-Q3 | 395 | 19,544,579 | — | $5.5B |
| 2025-Q2 | 382 | 19,343,418 | — | $4.7B |
| 2025-Q1 | 432 | 19,478,571 | — | $4.7B |
| 2024-Q4 | 454 | 18,785,691 | — | $6.2B |
| 2024-Q3 | 437 | 19,482,742 | — | $6.5B |
| 2024-Q2 | 439 | 19,873,250 | — | $5.4B |
| 2024-Q1 | 464 | 19,090,470 | — | $6.6B |
| 2023-Q4 | 484 | 18,826,280 | — | $6.1B |
| 2023-Q3 | 467 | 18,793,959 | — | $6.7B |
| 2023-Q2 | 467 | 18,844,395 | — | $7.2B |
| 2023-Q1 | 504 | 19,381,724 | — | $9.3B |
| 2022-Q4 | 470 | 19,255,210 | — | $8.0B |
| 2022-Q3 | 484 | 19,498,493 | — | $8.1B |
| 2022-Q2 | 499 | 19,094,942 | — | $9.5B |
| 2022-Q1 | 514 | 19,213,935 | — | $10.8B |
| 2021-Q4 | 532 | 19,188,589 | — | $14.5B |
| 2021-Q3 | 507 | 19,406,511 | — | $14.5B |
| 2021-Q2 | 507 | 19,421,941 | — | $12.5B |
| 2021-Q1 | 490 | 19,626,392 | — | $11.2B |
| 2020-Q4 | 489 | 19,676,122 | — | $11.5B |
| 2020-Q3 | 477 | 19,268,519 | — | $9.9B |
| 2020-Q2 | 468 | 19,347,822 | — | $8.7B |
| 2020-Q1 | 405 | 19,210,942 | — | $6.7B |
| 2019-Q4 | 386 | 19,313,086 | — | $7.1B |
| 2019-Q3 | 354 | 19,391,680 | — | $6.5B |
| 2019-Q2 | 330 | 18,881,145 | — | $5.8B |
| 2019-Q1 | 346 | 19,448,909 | — | $5.9B |
| 2018-Q4 | 328 | 19,344,669 | — | $4.4B |
| 2018-Q3 | 343 | 19,237,705 | — | $6.0B |
| 2018-Q2 | 326 | 19,410,540 | — | $5.6B |
| 2018-Q1 | 316 | 19,452,193 | — | $4.9B |
| 2017-Q4 | 302 | 19,213,410 | — | $4.6B |
| 2017-Q3 | 271 | 19,194,885 | — | $4.3B |
| 2017-Q2 | 276 | 18,808,521 | — | $4.3B |
| 2017-Q1 | 274 | 19,093,132 | — | $3.8B |
| 2016-Q4 | 261 | 20,574,733 | — | $3.8B |
| 2016-Q3 | 238 | 19,172,686 | — | $3.1B |
| 2016-Q2 | 234 | 19,089,798 | — | $2.7B |
| 2016-Q1 | 228 | 18,787,026 | — | $2.6B |
| 2015-Q4 | 239 | 18,813,913 | — | $2.6B |
| 2015-Q3 | 241 | 18,489,887 | — | $2.5B |
| 2015-Q2 | 222 | 18,147,133 | — | $2.7B |
| 2015-Q1 | 215 | 18,862,763 | — | $2.5B |
| 2014-Q4 | 213 | 18,827,731 | — | $2.3B |
| 2014-Q3 | 198 | 18,654,349 | — | $2.1B |
| 2014-Q2 | 201 | 18,596,756 | — | $2.2B |
| 2014-Q1 | 191 | 18,092,611 | — | $2.3B |
| 2013-Q4 | 195 | 18,316,386 | — | $2.3B |
| 2013-Q3 | 197 | 17,622,091 | — | $2.1B |
| 2013-Q2 | 192 | 17,405,443 | — | $2.0B |
| 2013-Q1 | 13 | 1,707,861 | — | $215M |
| Holder |
|---|
| % of class |
|---|
| Type |
|---|
| As of |
|---|
| First Eagle Investment Management, LLC | 11.4% | QII | 2025-06-30 | SEC → |
| BlackRock, Inc. | 7.4% | QII | 2025-09-30 | SEC → |
| VANGUARD GROUP INC | 0% | QII | 2026-03-13 | SEC → |
Source: SEC Schedule 13D/13G structured XML. 13D = active intent; 13G filers report passively (Rule 13d-1(b) QII / 13d-1(c) Passive / 13d-1(d) Exempt) and are not activists. Percent and delta are the group aggregate the filing reports. Structured 13D/G coverage begins December 2024 (SEC XML mandate).
