Security key
01749D105
ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM)
CUSIP: 01749D105
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 156,311,335
- Total 13F value
- $3,927,728,563
- Share change
- +14,858,139
- Put/Call ratio
- 210%
- SEC-reported price per share
- $25.13
- Number of holders
- 288
- Value change
- +$388,307,479
- Number of buys
- 170
- Number of sells
- 112
- Shares outstanding
- 185,710,725
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
Q1 2025
Institutions
288
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
FMR LLC
Disclosed value leader
FMR LLC
Comparable rows
15/15
Latest evidence
31 Dec 2024
13F
Lead comparable stake: 12%
Showing 1-6 of 15 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 12%.
15 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 FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
12%
VANGUARD GROUP INC
7.6%
BlackRock, Inc.
6.3%
JPMORGAN CHASE & CO
5.7%
STATE STREET CORP
3.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
Company
|
12%
|
$497,850,382
22,774,491 shares
|
— | 31 Dec 2024 |
| VANGUARD GROUP INC |
13F
Company
|
7.6%
|
$307,853,222
14,082,947 shares
|
— | 31 Dec 2024 |
| BlackRock, Inc. |
13F
Company
|
6.3%
|
$257,021,307
11,757,608 shares
|
— | 31 Dec 2024 |
| JPMORGAN CHASE & CO |
13F
Company
|
5.7%
|
$230,218,758
10,531,507 shares
|
— | 31 Dec 2024 |
| STATE STREET CORP |
13F
Company
|
3.2%
|
$128,481,757
5,877,482 shares
|
— | 31 Dec 2024 |
| Capital Research Global Investors |
13F
Company
|
3.1%
|
$126,093,027
5,768,208 shares
|
— | 31 Dec 2024 |
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 Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
288
Shares
156,311,335
Rows available
288
| 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 Q1 2025 vs Q1 2025 Across Filers
Q1 2025 holders
288
Q1 2025 holders
288
Holder diff
0
| Investor | Q1 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|