Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ALGM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 27.4M | $864.6M | +16.0% | 14.799% | 0.05% |
| 2 | BlackRock, Inc. | 12.5M | $394.0M | +2.4% | 6.743% | 0.01% |
| 3 | Capital Research Global Investors | 12.4M | $392.1M | -5.1% | 6.711% | 0.06% |
| 4 | Invesco Ltd. | 8.8M | $275.9M | +14.4% | 4.723% | 0.04% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.9M | $249.7M | — | 4.274% | 0.01% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 5.5M | $172.3M | — | 2.949% | 0.00% |
| 7 | STATE STREET CORP | 5.2M | $164.8M | -2.5% | 2.822% | 0.01% |
| 8 | Clearbridge Investments, LLC | 2.9M | $90.3M | -1.8% | 1.546% | 0.08% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $77.5M | +2.6% | 1.326% | 0.00% |
| 10 | MORGAN STANLEY | 2.3M | $71.7M | +1.9% | 1.228% | 0.00% |
| 11 | DIMENSIONAL FUND ADVISORS LP | 2.2M | $68.4M | +1.4% | 1.171% | 0.01% |
| 12 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 2.1M | $65.6M | +2.2% | 1.123% | 0.11% |
| 13 | PRINCIPAL FINANCIAL GROUP INC | 1.8M | $56.5M | +2.8% | 0.966% | 0.03% |
| 14 | LOOMIS SAYLES & CO L P | 1.7M | $52.8M | +101.9% | 0.903% | 0.07% |
| 15 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.5M | $46.2M | -47.8% | 0.791% | 0.07% |
| 16 | VOYA INVESTMENT MANAGEMENT LLC | 1.5M | $46.0M | +55.2% | 0.788% | 0.05% |
| 17 | ALLIANCEBERNSTEIN L.P. | 1.7M | $45.5M | +50.0% | 0.930% | 0.01% |
| 18 | GOLDMAN SACHS GROUP INC | 1.4M | $45.3M | +80.5% | 0.776% | 0.01% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.4M | $43.8M | +2.1% | 0.751% | 0.01% |
| 20 | SEGALL BRYANT & HAMILL, LLC | 1.0M | $34.7M | -16.0% | 0.566% | 0.56% |
| 21 | NORTHERN TRUST CORP | 1.0M | $33.0M | +3.0% | 0.564% | 0.00% |
| 22 | RAYMOND JAMES FINANCIAL INC | 996K | $31.4M | +9.6% | 0.537% | 0.01% |
| 23 | Nuveen, LLC | 948K | $29.9M | +291.7% | 0.511% | 0.01% |
| 24 | KENNEDY CAPITAL MANAGEMENT, INC. | 910K | $28.7M | +1928.6% | 0.491% | 0.61% |
| 25 | BANK OF AMERICA CORP /DE/ | 855K | $27.0M | +48.4% | 0.462% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ALGM — a direct measure of their conviction.
Filings activity in ALGM during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 313 | +9.1% | 42.87% | +4.80 pp | $4.00B | +13% |
| Q4 2025 | 287 | +1.4% | 38.07% | 4.17 pp | $3.56B | 9.9% |
| Q3 2025 | 283 | +6.0% | 42.24% | 11.39 pp | $3.94B | 21% |
| Q2 2025 | 267 | 5.0% | 53.63% | +14.10 pp | $5.01B | +36% |
| Q1 2025 | 281 | +11% | 39.53% | 6.29 pp | $3.69B | 14% |
| Q4 2024 | 253 | +6.3% | 45.82% | +11.77 pp | $4.28B | +35% |
| Q3 2024 | 238 | 10% | 34.05% | +2.98 pp | $3.18B | +9.6% |
| Q2 2024 | 265 | — | 31.07% | — | $2.90B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ALGM stock.
Based on Q1 2026 13F filings, institutional ownership of Allegro MicroSystems, Inc. stands at 42.9%, held across 313 reporting institutions.
FMR LLC is the largest reported institutional holder of ALGM, with approximately 27,421,206 shares worth $0.86B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ALGM.
Our composite Smart Money Score for ALGM is 54 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
72 institutions opened new positions in ALGM during Q1 2026, while 46 fully exited. 201 added to existing positions and 39 trimmed.
ALGM institutional ownership rose by 4.80 percentage points quarter-over-quarter, with a net change of +26 holders.
The top 10 institutions account for 68.8% of all reported 13F value in ALGM, and the top 25 account for 85.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Allegro MicroSystems, Inc. (ALGM) Institutional Ownership