Who owns ALAB (ALAB)
Which tracked institutional funds hold ALAB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ALAB 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
The tracked-fund tape on ALAB is one-sided between 2025-Q4 and 2026-Q1: 114 added or opened and 349 trimmed or exited — on balance reducing.
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
ALAB’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ALAB 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 704 tracked filers holding ALAB, 401 increased or opened the position and 354 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 ALAB 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 54
- VANGUARD PORTFOLIO MANAGEMENT LLC$801M
- VANGUARD CAPITAL MANAGEMENT LLC$695M
- VANGUARD FIDUCIARY TRUST CO$93M
- Altshuler Shaham Ltd$39M
- Strategy Capital LLC$39M
- Champlain Investment Partners, LLC$36M
Full exits 62
- VANGUARD GROUP INC$2.3B
- Polar Capital Holdings Plc$114M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$85M
- TWO SIGMA ADVISERS, LP$63M
- Rokos Capital Management LLP$46M
- CIBC WORLD MARKETS CORP$21M
Largest adds
- VAN ECK ASSOCIATES CORP$197M
- Atreides Management, LP$101M
- BNP PARIBAS FINANCIAL MARKETS$66M
- WESTFIELD CAPITAL MANAGEMENT CO LP$62M
- ALLIANCEBERNSTEIN L.P.$56M
- CANADA PENSION PLAN INVESTMENT BOARD$53M
Largest trims
- FMR LLC$1.4B
- BlackRock, Inc.$1.1B
- D. E. Shaw & Co., Inc.$241M
- STATE STREET CORP$150M
- LORD, ABBETT & CO. LLC$138M
- MORGAN STANLEY$132M
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 |
|---|---|---|---|---|
| FMR LLC added | 25,529,885 | $2.8B | 18.4% | 2026-Q1 |
| BlackRock, Inc. trimmed | 9,408,333 | $1.0B | 6.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 7,309,778 | $801M | 5.3% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 6,340,732 | $695M | 4.6% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 2,512,695 | $418M | 2.8% | 2026-Q1 |
| Atreides Management, LP added | 3,365,787 | $369M | 2.4% | 2026-Q1 |
| STATE STREET CORP added | 3,333,606 | $365M | 2.4% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC added | 2,573,005 | $282M | 1.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,508,264 | $274M | 1.8% | 2026-Q1 |
| Amundi added | 1,880,830 | $206M | 1.4% | 2026-Q1 |
| VAN ECK ASSOCIATES CORP added | 1,864,416 | $204M | 1.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,813,818 | $199M | 1.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,788,232 | $196M | 1.3% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,732,348 | $190M | 1.2% | 2026-Q1 |
| BARCLAYS PLC added | 1,554,180 | $170M | 1.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 1,519,561 | $167M | 1.1% | 2026-Q1 |
| CITIGROUP INC added | 1,513,054 | $166M | 1.1% | 2026-Q1 |
| UBS Group AG trimmed | 1,442,578 | $158M | 1.0% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,380,114 | $151M | 1.0% | 2026-Q1 |
| MAVERICK CAPITAL LTD trimmed | 955,356 | $105M | 0.7% | 2026-Q1 |
| Rafferty Asset Management, LLC trimmed | 945,506 | $104M | 0.7% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 860,113 | $94M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 851,761 | $93M | 0.6% | 2026-Q1 |
| 1832 Asset Management L.P. trimmed | 850,700 | $93M | 0.6% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 834,660 | $91M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP added | 804,661 | $88M | 0.6% | 2026-Q1 |
| Bridgewater Associates, LP added | 750,940 | $82M | 0.5% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 744,309 | $82M | 0.5% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 730,905 | $80M | 0.5% | 2026-Q1 |
| Legal & General Group Plc added | 720,256 | $79M | 0.5% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 688,213 | $75M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 661,505 | $73M | 0.5% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 649,191 | $71M | 0.5% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 618,499 | $68M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 610,669 | $67M | 0.4% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 600,500 | $66M | 0.4% | 2026-Q1 |
| Capital World Investors | 600,000 | $66M | 0.4% | 2026-Q1 |
| Value Aligned Research Advisors, LLC | 568,316 | $62M | 0.4% | 2026-Q1 |
| Artisan Partners Limited Partnership trimmed | 560,579 | $61M | 0.4% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 538,205 | $59M | 0.4% | 2026-Q1 |
| Analog Century Management LP added | 504,301 | $55M | 0.4% | 2026-Q1 |
| Clear Street Group Inc. trimmed | 499,772 | $55M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 475,520 | $52M | 0.3% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 453,741 | $50M | 0.3% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT CO LTD trimmed | 450,628 | $49M | 0.3% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 433,165 | $47M | 0.3% | 2026-Q1 |
| Tidal Investments LLC added | 407,732 | $45M | 0.3% | 2026-Q1 |
| Pacer Advisors, Inc. trimmed | 357,784 | $44M | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 430,389 | $43M | 0.3% | 2026-Q1 |
| Swiss National Bank added | 390,164 | $43M | 0.3% | 2026-Q1 |
| Altshuler Shaham Ltd new | 366,250 | $39M | 0.3% | 2026-Q1 |
| Greenhouse Funds LLLP added | 355,272 | $39M | 0.3% | 2026-Q1 |
| Strategy Capital LLC new | 352,268 | $39M | 0.3% | 2026-Q1 |
| Champlain Investment Partners, LLC new | 327,619 | $36M | 0.2% | 2026-Q1 |
| Focus Partners Wealth trimmed | 314,492 | $34M | 0.2% | 2026-Q1 |
| E20 Capital Ltd new | 303,925 | $33M | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 302,531 | $33M | 0.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. added | 293,853 | $32M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 280,075 | $31M | 0.2% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 280,637 | $31M | 0.2% | 2026-Q1 |
| AMAZON COM INC | 277,777 | $30M | 0.2% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 272,257 | $30M | 0.2% | 2026-Q1 |
| Stephens Investment Management Group LLC added | 269,885 | $30M | 0.2% | 2026-Q1 |
| Defiance ETFs, LLC added | 265,439 | $29M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 265,230 | $29M | 0.2% | 2026-Q1 |
| National Pension Service added | 263,820 | $29M | 0.2% | 2026-Q1 |
| Penserra Capital Management LLC trimmed | 256,788 | $28M | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 245,892 | $27M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 245,729 | $27M | 0.2% | 2026-Q1 |
| BAILLIE GIFFORD & CO trimmed | 245,128 | $27M | 0.2% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 243,543 | $27M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 238,949 | $26M | 0.2% | 2026-Q1 |
| Anther Capital Ltd new | 231,215 | $25M | 0.2% | 2026-Q1 |
| Tensor Edge Capital, LLC added | 228,400 | $25M | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 223,400 | $24M | 0.2% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 222,542 | $24M | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 220,407 | $24M | 0.2% | 2026-Q1 |
| Voleon Capital Management LP added | 218,843 | $24M | 0.2% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 211,656 | $23M | 0.2% | 2026-Q1 |
| LPL Financial LLC added | 204,022 | $22M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 202,860 | $22M | 0.1% | 2026-Q1 |
| ALKEON CAPITAL MANAGEMENT LLC trimmed | 200,000 | $22M | 0.1% | 2026-Q1 |
| Mirae Asset Global Investments Co., Ltd. trimmed | 196,269 | $22M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 190,620 | $21M | 0.1% | 2026-Q1 |
| Mitsubishi UFJ Asset Management Co., Ltd. trimmed | 186,667 | $20M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 13,648,438 | $2.3B | 14.9% | 2025-Q4 stale |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 1,507,675 | $295M | 1.9% | 2025-Q3 stale |
| Polar Capital Holdings Plc added | 684,453 | $114M | 0.7% | 2025-Q4 stale |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 510,000 | $85M | 0.6% | 2025-Q4 stale |
| Spyglass Capital Management LLC trimmed | 734,570 | $66M | 0.4% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP trimmed | 376,598 | $63M | 0.4% | 2025-Q4 stale |
| Altimeter Capital Management, LP added | 981,697 | $59M | 0.4% | 2025-Q1 stale |
| Rokos Capital Management LLP added | 273,694 | $46M | 0.3% | 2025-Q4 stale |
| COATUE MANAGEMENT LLC new | 676,586 | $40M | 0.3% | 2025-Q1 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP new | 202,965 | $40M | 0.3% | 2025-Q3 stale |
| Brevan Howard Capital Management LP added | 186,984 | $37M | 0.2% | 2025-Q3 stale |
| AXA Investment Managers S.A. new | 171,587 | $34M | 0.2% | 2025-Q3 stale |
| ING GROEP NV trimmed | 137,100 | $27M | 0.2% | 2025-Q3 stale |
| PUBLIC SECTOR PENSION INVESTMENT BOARD added | 296,000 | $27M | 0.2% | 2025-Q2 stale |
| CIBC WORLD MARKETS CORP new | 128,741 | $21M | 0.1% | 2025-Q4 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.