Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
683 institutional managers reported holding ALAB for the quarter ended Mar 31, 2026. Together they hold about 67% of shares outstanding; the top 10 hold 39%. 125 opened new positions; 131 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 25.53M | 14.09% | $2.80B | added +0.8% | 2024 Q1 |
| Vanguard Group | 14.87M | 8.21% | $1.63B | added +7.4% | 2024 Q1 |
| BlackRock | 11.45M | 6.32% | $1.25B | trimmed -11.7% | 2024 Q1 |
| Atreides Management, LP | 3.37M | 1.86% | $368.8M | added +108.9% | 2024 Q1 |
| State Street | 3.33M | 1.84% | $365.2M | added +7.5% | 2024 Q2 |
| Fred Alger Management, LLC | 2.57M | 1.42% | $281.9M | added +33% | 2024 Q1 |
| AllianceBernstein | 2.51M | 1.39% | $275.3M | added +15.4% | 2024 Q1 |
| Geode Capital | 2.51M | 1.39% | $274.8M | added +3.3% | 2024 Q1 |
| UBS | 2.09M | 1.16% | $229.2M | trimmed -1.8% | 2024 Q1 |
| BNP Paribas Financial Markets | 2.06M | 1.14% | $225.4M | added +109.1% | 2024 Q2 |
| Amundi | 1.88M | 1.04% | $206.1M | added +77.9% | 2024 Q3 |
| VAN ECK Associates CORP | 1.86M | 1.03% | $204.3M | added +4059.9% | 2024 Q3 |
| Bank OF America CORP /DE/ | 1.79M | 0.99% | $195.9M | added +20.1% | 2024 Q1 |
| Morgan Stanley | 1.73M | 0.96% | $189.8M | trimmed -10.4% | 2024 Q1 |
| Barclays PLC | 1.55M | 0.86% | $170.3M | added +35.1% | 2024 Q1 |
| D. E. Shaw | 1.52M | 0.84% | $166.5M | trimmed -38% | 2024 Q4 |
| Citigroup INC | 1.51M | 0.83% | $165.8M | added +63% | 2024 Q2 |
| Goldman Sachs | 1.38M | 0.76% | $151.2M | added +5.1% | 2024 Q2 |
| Maverick Capital | 955.4k | 0.53% | $104.7M | trimmed -2.1% | 2024 Q1 |
| Rafferty Asset Management, LLC | 945.5k | 0.52% | $103.6M | trimmed -19% | 2025 Q3 |
| Westfield Capital Management CO LP | 860.1k | 0.47% | $94.2M | added +340.4% | 2024 Q3 |
| 1832 Asset Management L.p. | 850.7k | 0.47% | $93.2M | trimmed -36.8% | 2024 Q4 |
| Fuller & Thaler Asset Management, INC. | 834.7k | 0.46% | $91.4M | added +1.3% | 2024 Q4 |
| Northern Trust | 804.7k | 0.44% | $88.2M | added +5.7% | 2024 Q2 |
| Bridgewater Associates | 750.9k | 0.41% | $82.3M | added +212.2% | 2025 Q2 |
| Two Sigma | 744.3k | 0.41% | $81.5M | added +17.5% | 2024 Q3 |
| Deutsche Bank AG\ | 730.9k | 0.40% | $80.1M | trimmed -25.5% | 2024 Q2 |
| Legal & General Group PLC | 720.3k | 0.40% | $78.9M | added +35.1% | 2024 Q2 |
| Frontier Capital Management CO LLC | 688.2k | 0.38% | $75.4M | trimmed -6.4% | 2025 Q1 |
| Charles Schwab Investment Management | 661.5k | 0.36% | $72.5M | added +4.3% | 2024 Q2 |
| T. Rowe Price | 618.5k | 0.34% | $67.8M | trimmed -46.9% | 2024 Q1 |
| Susquehanna International Group | 610.7k | 0.34% | $66.9M | added +61.6% | 2024 Q1 |
| CPP Investment Board | 600.5k | 0.33% | $65.8M | added +659.2% | 2024 Q4 |
| Capital Group (American Funds) | 600.0k | 0.33% | $65.7M | unchanged | 2024 Q1 |
| Value Aligned Research Advisors, LLC | 568.3k | 0.31% | $62.3M | unchanged | 2024 Q1 |
| Artisan Partners | 560.6k | 0.31% | $61.4M | trimmed -37.4% | 2024 Q1 |
| Manufacturers Life Insurance Company, THE | 538.2k | 0.30% | $59.0M | added +79.8% | 2024 Q2 |
| Analog Century Management LP (focused) | 504.3k | 0.28% | $55.3M | added +63.2% | 2025 Q4 |
| Clear Street Group INC. | 499.8k | 0.28% | $54.8M | trimmed -13.4% | 2025 Q3 |
| BNY Mellon | 475.5k | 0.26% | $52.1M | trimmed -5.2% | 2024 Q2 |
| Adage Capital Partners GP, L.l.c. | 453.7k | 0.25% | $49.7M | added +168.9% | 2024 Q1 |
| Nomura Asset Management CO LTD | 450.6k | 0.25% | $49.4M | trimmed -4.8% | 2024 Q1 |
| Janus Henderson | 433.2k | 0.24% | $47.5M | added +3696.4% | 2024 Q4 |
| Tidal Investments LLC | 407.7k | 0.23% | $44.7M | added +220.5% | 2024 Q2 |
| Swiss National Bank | 390.2k | 0.21% | $42.7M | added +7.1% | 2024 Q4 |
| Invesco | 370.2k | 0.20% | $40.6M | trimmed -31.1% | 2024 Q1 |
| Altshuler Shaham LTD | 366.3k | 0.20% | $40.1M | opened | 2026 Q1 |
| Pacer Advisors, INC. | 357.8k | 0.20% | $39.2M | trimmed -9.5% | 2022 Q4 |
| Greenhouse Funds Lllp (focused) | 355.3k | 0.20% | $38.9M | added +13% | 2024 Q2 |
| Strategy Capital LLC (focused) | 352.3k | 0.19% | $38.6M | opened | 2026 Q1 |
Largest 50 of 683 shown; the full ranked, searchable register is at boothcheck.com/holders/ALAB. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.