Security key
01749D105
ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM)
CUSIP: 01749D105
Q2 2025 13F Holders as of 30 Jun 2025
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 146,056,579
- Total 13F value
- $4,992,929,892
- Share change
- -8,405,312
- Put/Call ratio
- 802%
- SEC-reported price per share
- $34.19
- Number of holders
- 270
- Value change
- -$219,199,122
- Number of buys
- 148
- Number of sells
- 168
- Shares outstanding
- 187,039,843
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2025
Institutions
270
Top holders
10
ALGM full security history
Ownership snapshot
Full 13F holder table
ALLEGRO MICROSYSTEMS, INC. SEC filings
ALLEGRO MICROSYSTEMS, INC. company facts
Broader feeds
Ownership snapshot
Top reported holders of ALGM - ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Sanken Electric Co., Ltd.
Disclosed value leader
Sanken Electric Co., Ltd.
Comparable rows
0/15
Latest evidence
31 Mar 2025
3/4/5
13F
Highest disclosed value: $1,383,411,231
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
Sanken Electric Co., Ltd. has the largest disclosed position value at $1.38B.
0 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Sanken Electric Co., Ltd.'s linked filing trail.
Disclosed position value
Top 5
Sanken Electric Co., Ltd.
$1.38B
OEP SKNA, L.P.
$494.88M
FMR LLC
$676.53M
VANGUARD GROUP INC
$354.33M
BlackRock, Inc.
$293.31M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Sanken Electric Co., Ltd. |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$1,383,411,231
59,732,782 shares
|
— | 07 Aug 2024 |
| OEP SKNA, L.P. |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$494,884,886
17,649,247 shares
|
— | 02 Feb 2023 |
| FMR LLC |
13F
Company
|
—
denominator unverified
|
$676,527,652
26,921,116 shares
|
— | 31 Mar 2025 |
| VANGUARD GROUP INC |
13F
Company
|
—
denominator unverified
|
$354,333,426
14,100,017 shares
|
— | 31 Mar 2025 |
| BlackRock, Inc. |
13F
Company
|
—
denominator unverified
|
$293,306,244
11,671,558 shares
|
— | 31 Mar 2025 |
| Capital Research Global Investors |
13F
Company
|
—
denominator unverified
|
$278,008,189
11,062,801 shares
|
— | 31 Mar 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
270
Shares
146,056,579
Rows available
270
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2025 vs Q1 2025 Across Filers
Q1 2025 holders
288
Q2 2025 holders
270
Holder diff
-18
| Investor | Q1 2025 Shares | Q2 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q2 2025 value | Value change | Value Chg % |
|---|