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ALGM · Allegro Microsystems, Inc.

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$37.53 +0.34 (+0.91%)
Market Cap
$6.93B
Shares
186.40M

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.

Holders: 375
Total Value: $10,363,993,560
Total Shares: 148,865,216

Institutional Ownership Trend

23 quarters

Holder Concentration

Across 375 13F filers · Δ vs Mar 31, 2026
Top Holder
17.2%
Sep 2023 → Jun 2026 · range 12.5% – 19.8%
−2.6 pts
Top 5
52.3%
Sep 2023 → Jun 2026 · range 39.0% – 55.7%
+2.0 pts
Top 10
69.5%
Sep 2023 → Jun 2026 · range 55.1% – 69.5%
+1.9 pts
HHI
690
Sep 2023 → Jun 2026 · range 467 – 796
Broadly held−35

Quarterly Activity

vs Mar 31, 2026
New
101
Increased
117
Decreased
108
Sold Out
46
Unchanged
49
Holder count: +55
Institutional value: +137.2%
Shares held: +7.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 386
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 866291 CUSIP 01749D105 13F (30d) 343 filings 337 filers Visit website Investor relations