Allegro Microsystems Inc
Institutional managers reporting a position on Form 13F-HR, as of Mar 31, 2026
1Largest holdersEvery position of a manager summed
- 1FMR LLC$864.59M20.3%
- 2BlackRock, Inc.$393.96M9.3%
- 3Capital Research Global Investors$392.09M9.2%
- 4Invesco Ltd.$275.93M6.5%
- 5VANGUARD PORTFOLIO MANAGEMENT LLC$249.72M5.9%
- $242.6M5.7%
- 7VANGUARD CAPITAL MANAGEMENT LLC$172.3M4.1%
- 8STATE STREET CORP$164.84M3.9%
- 9Clearbridge Investments, LLC$90.29M2.1%
- 10GEODE CAPITAL MANAGEMENT, LLC$77.48M1.8%
2HoldersChange from Dec 31, 2025
| Holder | Quantity | Change | Value | Share | Filed |
|---|---|---|---|---|---|
| FMR LLCCommon shares | 27.4M | +3.8M+16.0% | $864.59M | 20.35% | May 15, 2026 |
| BlackRock, Inc.Common shares | 12.5M | +293.4K+2.4% | $393.96M | 9.27% | May 13, 2026 |
| Capital Research Global InvestorsCommon shares | 12.4M | −675.7K−5.2% | $392.09M | 9.23% | May 13, 2026 |
| Invesco Ltd.Common shares | 8.8M | +1.1M+14.4% | $275.93M | 6.49% | May 12, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLCCommon shares | 7.9M | New | $249.72M | 5.88% | May 8, 2026 |
| JPMORGAN CHASE & COCommon shares · Amendment 1 (restatement) | 8.7M | +1.3M+17.8% | $242.6M | 5.71% | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLCCommon shares · Amendment 1 (restatement) | 5.5M | New | $172.3M | 4.06% | May 15, 2026 |
| STATE STREET CORPCommon shares | 5.2M | −131.4K−2.5% | $164.84M | 3.88% | May 15, 2026 |
| Clearbridge Investments, LLCCommon shares | 2.9M | −53,075−1.8% | $90.29M | 2.13% | May 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLCCommon shares | 2.5M | +62,852+2.6% | $77.48M | 1.82% | May 15, 2026 |
| MORGAN STANLEYCommon shares | 2.3M | +42,149+1.9% | $71.74M | 1.69% | May 15, 2026 |
| DIMENSIONAL FUND ADVISORS LPCommon shares | 2.2M | +30,340+1.4% | $68.4M | 1.61% | May 7, 2026 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC.Common shares | 2.1M | +44,429+2.2% | $65.6M | 1.54% | May 15, 2026 |
| PRINCIPAL FINANCIAL GROUP INCCommon shares | 1.8M | +48,170+2.8% | $56.45M | 1.33% | May 4, 2026 |
| LOOMIS SAYLES & CO L PCommon shares | 1.7M | +844.9K+101.9% | $52.78M | 1.24% | May 14, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C.Common shares | 1.5M | −1.3M−47.8% | $46.18M | 1.09% | May 15, 2026 |
| VOYA INVESTMENT MANAGEMENT LLCCommon shares | 1.5M | +518.9K+55.2% | $46.01M | 1.08% | May 12, 2026 |
| ALLIANCEBERNSTEIN L.P.Common shares | 1.7M | +574.7K+50.0% | $45.46M | 1.07% | May 15, 2026 |
| GOLDMAN SACHS GROUP INCCommon shares | 1.4M | +640.9K+80.5% | $45.32M | 1.07% | May 15, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCCommon shares | 1.4M | +28,188+2.1% | $43.85M | 1.03% | May 15, 2026 |
| NORTHERN TRUST CORPCommon shares | 1M | +30,542+3.0% | $32.97M | 0.78% | May 14, 2026 |
| SEGALL BRYANT & HAMILL, LLCCommon shares · Amendment 1 (restatement) | 1M | −203.3K−16.3% | $32.95M | 0.78% | May 22, 2026 |
| RAYMOND JAMES FINANCIAL INCCommon shares | 995.8K | +87,312+9.6% | $31.4M | 0.74% | May 14, 2026 |
| Nuveen, LLCCommon shares | 947.5K | +705.6K+291.6% | $29.87M | 0.70% | Apr 30, 2026 |
| KENNEDY CAPITAL MANAGEMENT LLCCommon shares | 910K | +865.2K+1928.6% | $28.69M | 0.68% | May 13, 2026 |
3Report periods
| Report date | Filings | Holdings | Combined value | Latest filed | |
|---|---|---|---|---|---|
| Mar 31, 2026 | 317 | 330 | $4.25B | May 22, 2026 | |
| Dec 31, 2025 | 300 | 319 | $3.6B | May 27, 2026 | |
| Sep 30, 2025 | 302 | 322 | $4.24B | May 27, 2026 | |
| Jun 30, 2025 | 286 | 312 | $5.2B | Apr 24, 2026 | |
| Mar 31, 2025 | 11 | 11 | $137.37M | May 11, 2026 |
Filings for a quarter keep arriving for months after it ends, so the most recent and the earliest periods can be incomplete.
4About this data
Each row is one manager's position as disclosed in one Form 13F-HR filing; managers below the Form 13F reporting threshold do not appear. Values, quantities and manager names are as reported in each filing. A row totals the entries of one filing that share a security class and option type; a value or quantity is shown as not comparable when those entries differ in currency or unit. A restatement replaces the original filing and every earlier amendment for the same period; an amendment adding new holdings is listed alongside the filing it supplements and labelled as such. Positions are matched to this listing through the security identifiers reported in the filing.