Ranked by reported Q2 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 | 25.6M | $1.78B | -6.7% | 13.730% | 0.08% |
| 2 | BlackRock, Inc. | 13.9M | $967.0M | +11.2% | 7.455% | 0.01% |
| 3 | Invesco Ltd. | 13.7M | $952.3M | +56.3% | 7.342% | 0.08% |
| 4 |
Filings activity in ALGM during Q2 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 |
|---|---|---|---|---|---|---|
| Q2 2026 | 377 | +18% | 79.97% | +5.22 pp | $9.85B | +132% |
| Q1 2026 | 319 | +10% | 74.75% | +0.48 pp | $4.25B | +18% |
| Q4 2025 | 289 | 0.3% | 74.27% | 1.10 pp | $3.59B | 10% |
| Q3 2025 | 290 | +8.6% | 75.37% | 5.50 pp | $4.00B | 20% |
| Q2 2025 | 267 | 5.0% | 80.87% | 0.38 pp | $5.01B | +36% |
| Q1 2025 | 281 | +11% |
Quick answers to the most common questions about buying ALGM stock.
Based on Q2 2026 13F filings, institutional ownership of Allegro MicroSystems, Inc. stands at 80.0%, held across 377 reporting institutions.
FMR LLC is the largest reported institutional holder of ALGM, with approximately 25,581,021 shares worth $1.78B as of Q2 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 57 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
| JPMORGAN CHASE & CO |
| 12.7M |
| $844.9M |
| +47.1% |
| 6.829% |
| 0.05% |
| 5 | Capital Research Global Investors | 12.0M | $835.9M | -3.5% | 6.444% | 0.12% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.7M | $533.9M | -3.2% | 4.116% | 0.02% |
| 7 | STATE STREET CORP | 5.7M | $395.2M | +8.6% | 3.047% | 0.01% |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 5.5M | $383.5M | +0.8% | 2.957% | 0.01% |
| 9 | Clearbridge Investments, LLC | 2.9M | $205.1M | +2.9% | 1.581% | 0.17% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 2.6M | $184.2M | +7.7% | 1.420% | 0.01% |
| 11 | DIMENSIONAL FUND ADVISORS LP | 2.1M | $147.8M | -2.1% | 1.140% | 0.03% |
| 12 | MORGAN STANLEY | 1.8M | $126.0M | -20.5% | 0.971% | 0.01% |
| 13 | LOOMIS SAYLES & CO L P | 1.6M | $112.8M | -3.2% | 0.869% | 0.14% |
| 14 | GOLDMAN SACHS GROUP INC | 1.6M | $109.7M | +9.6% | 0.845% | 0.01% |
| 15 | PRINCIPAL FINANCIAL GROUP INC | 1.5M | $103.7M | -16.8% | 0.800% | 0.05% |
| 16 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.4M | $100.5M | +1983.1% | 0.775% | 0.03% |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.4M | $94.7M | -2.2% | 0.730% | 0.01% |
| 18 | NORGES BANK | 1.3M | $90.2M | — | 0.695% | 0.01% |
| 19 | NORTHERN TRUST CORP | 1.2M | $81.3M | +11.6% | 0.626% | 0.01% |
| 20 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.2M | $80.7M | -44.3% | 0.622% | 0.12% |
| 21 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.1M | $78.1M | -23.4% | 0.602% | 0.11% |
| 22 | VOYA INVESTMENT MANAGEMENT LLC | 967K | $67.3M | -33.7% | 0.519% | 0.06% |
| 23 | RAYMOND JAMES FINANCIAL INC | 928K | $64.6M | -6.8% | 0.498% | 0.02% |
| 24 | BANK OF AMERICA CORP /DE/ | 922K | $64.2M | +7.8% | 0.495% | 0.00% |
| 25 | WELLINGTON MANAGEMENT GROUP LLP | 815K | $56.7M | +21.1% | 0.437% | 0.01% |
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.
| 81.25% |
| 25.13 pp |
| $3.69B |
| 14% |
| Q4 2024 | 253 | +6.3% | 106.38% | +29.47 pp | $4.28B | +35% |
| Q3 2024 | 238 | — | 76.91% | — | $3.18B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
92 institutions opened new positions in ALGM during Q2 2026, while 38 fully exited. 243 added to existing positions and 29 trimmed.
ALGM institutional ownership rose by 5.22 percentage points quarter-over-quarter, with a net change of +58 holders.
The top 10 institutions account for 71.9% of all reported 13F value in ALGM, and the top 25 account for 85.9%.
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