Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
306 institutional managers reported holding ALGM for the quarter ended Mar 31, 2026. Together they hold about 70% of shares outstanding; the top 10 hold 49%. 61 opened new positions; 42 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 27.42M | 14.73% | $864.3M | added +16% | 2020 Q4 |
| Vanguard Group | 14.36M | 7.71% | $452.8M | added +1% | 2020 Q4 |
| BlackRock | 12.49M | 6.71% | $393.8M | added +2.4% | 2020 Q4 |
| Capital Research Global Investors | 12.44M | 6.68% | $392.0M | trimmed -5.2% | 2024 Q3 |
| Invesco | 8.75M | 4.70% | $275.8M | added +14.4% | 2020 Q4 |
| State Street | 5.23M | 2.81% | $164.8M | trimmed -2.5% | 2020 Q4 |
| Clearbridge Investments, LLC | 2.86M | 1.54% | $90.3M | trimmed -1.8% | 2020 Q4 |
| Geode Capital | 2.46M | 1.32% | $77.4M | added +2.6% | 2020 Q4 |
| Morgan Stanley | 2.28M | 1.22% | $71.7M | added +1.9% | 2020 Q4 |
| Dimensional Fund Advisors | 2.17M | 1.17% | $68.4M | added +1.4% | 2021 Q3 |
| Nomura Asset Management International INC. | 2.08M | 1.12% | $65.6M | added +2.2% | 2025 Q4 |
| Principal Financial Group INC | 1.79M | 0.96% | $56.4M | added +2.8% | 2020 Q4 |
| AllianceBernstein | 1.72M | 0.93% | $54.3M | added +50% | 2020 Q4 |
| Loomis Sayles & CO L P | 1.67M | 0.90% | $52.8M | added +101.9% | 2024 Q3 |
| Adage Capital Partners GP, L.l.c. | 1.46M | 0.79% | $46.2M | trimmed -47.8% | 2020 Q4 |
| Voya Investment Management LLC | 1.46M | 0.78% | $46.0M | added +55.2% | 2021 Q1 |
| Goldman Sachs | 1.44M | 0.77% | $45.3M | added +80.5% | 2020 Q4 |
| Charles Schwab Investment Management | 1.39M | 0.75% | $43.8M | added +2.1% | 2020 Q4 |
| Segall Bryant & Hamill, LLC | 1.05M | 0.56% | $33.0M | trimmed -16% | 2025 Q1 |
| Northern Trust | 1.05M | 0.56% | $33.0M | added +3% | 2020 Q4 |
| Raymond James Financial INC | 995.8k | 0.54% | $31.4M | added +9.6% | 2021 Q1 |
| Nuveen | 947.5k | 0.51% | $29.9M | added +291.6% | 2020 Q4 |
| Kennedy Capital Management LLC | 910.0k | 0.49% | $28.7M | added +1928.6% | 2022 Q1 |
| Bank OF America CORP /DE/ | 855.5k | 0.46% | $27.0M | added +48.3% | 2020 Q4 |
| UBS | 780.4k | 0.42% | $24.6M | added +29% | 2020 Q4 |
| BNY Mellon | 743.3k | 0.40% | $23.4M | trimmed -1% | 2020 Q4 |
| Marshall Wace | 739.8k | 0.40% | $23.3M | added +3.5% | 2025 Q3 |
| Aperture Investors, LLC | 709.7k | 0.38% | $22.4M | opened | 2026 Q1 |
| Silvercrest Asset Management Group LLC | 707.9k | 0.38% | $22.3M | added +4.8% | 2022 Q1 |
| Wellington Management | 673.1k | 0.36% | $21.2M | trimmed -39.2% | 2024 Q3 |
| Gw&k Investment Management, LLC | 659.6k | 0.35% | $20.8M | trimmed -1.4% | 2022 Q4 |
| Two Sigma | 639.8k | 0.34% | $20.2M | added +105.8% | 2023 Q1 |
| T. Rowe Price Investment Management, INC. | 561.3k | 0.30% | $17.7M | added +328% | 2023 Q4 |
| Lord, Abbett & CO. LLC | 530.5k | 0.28% | $16.7M | opened | 2026 Q1 |
| Lightrock Netherlands B.v. (focused) | 508.0k | 0.27% | $16.0M | added +43.3% | 2024 Q4 |
| Talos Eurisko Asset Management LP (focused) | 493.2k | 0.27% | $15.5M | trimmed -12% | 2025 Q4 |
| S Squared Technology, LLC (focused) | 457.5k | 0.25% | $14.4M | unchanged | 2021 Q1 |
| First Trust Advisors LP | 414.9k | 0.22% | $13.1M | trimmed -7.6% | 2021 Q3 |
| Citadel Advisors | 399.4k | 0.21% | $12.6M | trimmed -84.4% | 2022 Q2 |
| Ameriprise Financial INC | 359.3k | 0.19% | $11.3M | trimmed -3.8% | 2020 Q4 |
| AQR Capital | 345.1k | 0.18% | $10.9M | added +5.2% | 2025 Q1 |
| Gotham Asset Management | 312.2k | 0.17% | $9.8M | added +327.2% | 2025 Q2 |
| Rhumbline Advisers | 308.4k | 0.17% | $9.7M | added +2.7% | 2020 Q4 |
| Jacobs Levy Equity Management, INC | 308.1k | 0.17% | $9.7M | opened | 2026 Q1 |
| Allspring Global Investments Holdings, LLC | 307.6k | 0.17% | $9.7M | trimmed -13.6% | 2021 Q4 |
| Man Group | 306.3k | 0.17% | $9.7M | trimmed -20.9% | 2025 Q3 |
| Sirios Capital Management L P | 298.4k | 0.16% | $9.4M | opened | 2026 Q1 |
| Frontier Capital Management CO LLC | 264.0k | 0.14% | $8.3M | trimmed -49.7% | 2024 Q4 |
| HRT Financial LP | 261.8k | 0.14% | $8.3M | added +189.8% | 2024 Q4 |
| Peregrine Capital Management LLC | 259.8k | 0.14% | $8.2M | trimmed -4.1% | 2025 Q1 |
Largest 50 of 306 shown; the full ranked, searchable register is at boothcheck.com/holders/ALGM. 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.