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ALGM · Allegro Microsystems, Inc. · Holdings

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$38.98 -0.55 (-1.39%)
Market Cap
$6.89B
Shares
186.40M
Volume · Oct 5 3.48M Avg daily vol (3M) 2.42M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 381
Total Value: $10,378,264,900
Total Shares: 149,070,577
Showing 1–100 of 392 holdings by value · page 1 of 4

Institutional Ownership Trend

24 quarters

Holder Concentration

Across 380 13F filers
Top Holder
17.2%
Sep 2023 → Jun 2026 · range 12.5% – 19.8%
of institutional value
Top 5
52.2%
Sep 2023 → Jun 2026 · range 39.0% – 55.7%
of institutional value
Top 10
69.4%
Sep 2023 → Jun 2026 · range 55.1% – 69.4%
of institutional value
HHI
688
Sep 2023 → Jun 2026 · range 467 – 796
Broadly held
Showing 100 of 392
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 866291 CUSIP 01749D105 13F (30d) 8 filings 8 filers Visit website Investor relations