Who owns SLAB (SLAB)
Which tracked institutional funds hold SLAB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SLAB company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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
185 tracked funds added or opened SLAB while 73 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
SLAB’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes SLAB more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in SLAB 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 376 tracked filers holding SLAB, 218 increased or opened the position and 177 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 SLAB 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 65
- VANGUARD PORTFOLIO MANAGEMENT LLC$445M
- VANGUARD CAPITAL MANAGEMENT LLC$307M
- BALYASNY ASSET MANAGEMENT L.P.$257M
- Pentwater Capital Management LP$104M
- AQR Arbitrage LLC$64M
- Magnetar Financial LLC$51M
Full exits 35
- VANGUARD GROUP INC$515M
- WESTFIELD CAPITAL MANAGEMENT CO LP$72M
- SCHWARTZ INVESTMENT COUNSEL INC$25M
- JACOBS LEVY EQUITY MANAGEMENT, INC$16M
- Foresight Group Ltd Liability Partnership$14M
- Grandeur Peak Global Advisors, LLC$12M
Largest adds
- BlackRock, Inc.$147M
- STATE STREET CORP$104M
- MILLENNIUM MANAGEMENT LLC$94M
- MORGAN STANLEY$70M
- GEODE CAPITAL MANAGEMENT, LLC$69M
- CITADEL ADVISORS LLC$69M
Largest trims
- FMR LLC$634M
- NORGES BANK$49M
- Invesco Ltd.$40M
- Squarepoint Ops LLC$33M
- WELLINGTON MANAGEMENT GROUP LLP$31M
- AQR CAPITAL MANAGEMENT LLC$28M
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 | 3,700,420 | $770M | 11.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,138,836 | $445M | 6.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,473,330 | $307M | 4.7% | 2026-Q1 |
| STATE STREET CORP trimmed | 1,467,061 | $305M | 4.7% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,233,893 | $257M | 4.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 851,381 | $177M | 2.7% | 2026-Q1 |
| Capital Research Global Investors | 811,937 | $169M | 2.6% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 661,438 | $138M | 2.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 636,326 | $132M | 2.0% | 2026-Q1 |
| MORGAN STANLEY added | 590,908 | $123M | 1.9% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 566,337 | $118M | 1.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 520,003 | $108M | 1.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 509,533 | $106M | 1.6% | 2026-Q1 |
| Pentwater Capital Management LP new | 500,000 | $104M | 1.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 457,196 | $95M | 1.5% | 2026-Q1 |
| Pathstone Holdings, LLC added | 425,003 | $88M | 1.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 395,999 | $82M | 1.3% | 2026-Q1 |
| NORTHERN TRUST CORP added | 387,096 | $81M | 1.2% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 383,083 | $80M | 1.2% | 2026-Q1 |
| UBS Group AG added | 381,156 | $79M | 1.2% | 2026-Q1 |
| Thrivent Financial for Lutherans trimmed | 362,128 | $75M | 1.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 342,025 | $71M | 1.1% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 341,500 | $71M | 1.1% | 2026-Q1 |
| AQR Arbitrage LLC new | 308,783 | $64M | 1.0% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 273,346 | $57M | 0.9% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP trimmed | 249,626 | $52M | 0.8% | 2026-Q1 |
| Magnetar Financial LLC added | 245,824 | $51M | 0.8% | 2026-Q1 |
| Clearbridge Investments, LLC trimmed | 245,099 | $51M | 0.8% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 239,318 | $50M | 0.8% | 2026-Q1 |
| LMR Partners LLP added | 238,166 | $50M | 0.8% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 236,806 | $49M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 229,027 | $48M | 0.7% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 223,342 | $46M | 0.7% | 2026-Q1 |
| ALPINE ASSOCIATES MANAGEMENT INC. new | 222,450 | $46M | 0.7% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 214,231 | $45M | 0.7% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 214,071 | $44M | 0.7% | 2026-Q1 |
| Stephens Investment Management Group LLC trimmed | 202,029 | $42M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 197,317 | $41M | 0.6% | 2026-Q1 |
| Kryger Capital LLC new | 179,387 | $37M | 0.6% | 2026-Q1 |
| SONA ASSET MANAGEMENT (US) LLC new | 175,059 | $36M | 0.6% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 172,200 | $36M | 0.6% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 155,098 | $32M | 0.5% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 245,743 | $32M | 0.5% | 2026-Q1 |
| Allianz Asset Management GmbH added | 154,013 | $32M | 0.5% | 2026-Q1 |
| TIG Advisors, LLC new | 142,633 | $30M | 0.5% | 2026-Q1 |
| Verition Fund Management LLC added | 139,479 | $29M | 0.4% | 2026-Q1 |
| Leeward Investments, LLC - MA trimmed | 122,592 | $26M | 0.4% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 119,399 | $25M | 0.4% | 2026-Q1 |
| NINE MASTS CAPITAL Ltd new | 119,369 | $25M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 117,537 | $24M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 118,004 | $24M | 0.4% | 2026-Q1 |
| Sand Grove Capital Management LLP new | 112,365 | $23M | 0.4% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 112,304 | $23M | 0.4% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 108,790 | $23M | 0.3% | 2026-Q1 |
| Man Group plc added | 106,138 | $22M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 97,186 | $20M | 0.3% | 2026-Q1 |
| DAYMARK WEALTH PARTNERS, LLC new | 85,889 | $18M | 0.3% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 79,409 | $17M | 0.3% | 2026-Q1 |
| DAVIDSON INVESTMENT ADVISORS trimmed | 144,502 | $16M | 0.3% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 76,262 | $16M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 75,009 | $16M | 0.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 71,830 | $15M | 0.2% | 2026-Q1 |
| Woodline Partners LP added | 65,808 | $14M | 0.2% | 2026-Q1 |
| Slotnik Capital, LLC new | 65,500 | $14M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 65,000 | $14M | 0.2% | 2026-Q1 |
| California Public Employees Retirement System added | 64,276 | $13M | 0.2% | 2026-Q1 |
| KORNITZER CAPITAL MANAGEMENT INC /KS added | 63,010 | $13M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 60,865 | $13M | 0.2% | 2026-Q1 |
| Grantham, Mayo, Van Otterloo & Co. LLC new | 58,691 | $12M | 0.2% | 2026-Q1 |
| WATER ISLAND CAPITAL LLC new | 58,417 | $12M | 0.2% | 2026-Q1 |
| Avalon Global Asset Management LLC trimmed | 57,400 | $12M | 0.2% | 2026-Q1 |
| Fort Baker Capital Management LP new | 53,955 | $11M | 0.2% | 2026-Q1 |
| WINTON GROUP Ltd new | 53,826 | $11M | 0.2% | 2026-Q1 |
| Retirement Systems of Alabama added | 50,502 | $11M | 0.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 49,717 | $10M | 0.2% | 2026-Q1 |
| FMR LLC trimmed | 48,300 | $10M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 47,412 | $10M | 0.2% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 45,262 | $9M | 0.1% | 2026-Q1 |
| Public Sector Pension Investment Board added | 44,548 | $9M | 0.1% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 44,100 | $9M | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 41,670 | $9M | 0.1% | 2026-Q1 |
| Sagefield Capital LP new | 40,428 | $8M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 38,003 | $8M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 37,839 | $8M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 3,942,714 | $515M | 8.0% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 997,151 | $131M | 2.0% | 2025-Q3 stale |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 547,403 | $72M | 1.1% | 2025-Q4 stale |
| Whale Rock Capital Management LLC new | 248,282 | $37M | 0.6% | 2025-Q2 stale |
| SCHWARTZ INVESTMENT COUNSEL INC | 192,790 | $25M | 0.4% | 2025-Q4 stale |
| AXA S.A. trimmed | 156,578 | $23M | 0.4% | 2025-Q2 stale |
| AXA Investment Managers S.A. new | 145,863 | $19M | 0.3% | 2025-Q3 stale |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 119,420 | $16M | 0.2% | 2025-Q4 stale |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 132,754 | $15M | 0.2% | 2025-Q1 stale |
| Foresight Group Ltd Liability Partnership trimmed | 109,232 | $14M | 0.2% | 2025-Q4 stale |
| Grandeur Peak Global Advisors, LLC added | 95,513 | $12M | 0.2% | 2025-Q4 stale |
| SEGALL BRYANT & HAMILL, LLC added | 66,256 | $10M | 0.2% | 2025-Q2 stale |
| Trexquant Investment LP added | 70,699 | $9M | 0.1% | 2025-Q4 stale |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 65,752 | $9M | 0.1% | 2025-Q4 stale |
| Edgestream Partners, L.P. added | 64,934 | $8M | 0.1% | 2025-Q4 stale |
| IMC-Chicago, LLC new | 56,985 | $8M | 0.1% | 2025-Q2 stale |
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.