Ticker · CUSIP 01749D105

ALGM

ALLEGRO MICROSYSTEMS INC
Technology·Semiconductors
···Share
Holders (tracked)
17
Combined shares
9,100,499
Combined value
$237.40M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+6 vs previous quarter over the last 8.
17122024Q12025Q4

SEC event timeline

20 events
  1. Ken Griffin (Citadel Advisors) added2026-02-17
    +2,228,889 shares · 2025Q4
    Position
  2. Two Sigma Investments added2026-02-17
    +149,577 shares · 2025Q4
    Position
  3. D.E. Shaw & Co. opened position2026-02-17
    +55,304 shares · 2025Q4
    Position
  4. Izzy Englander (Millennium Mgmt) added2026-02-17
    +539,113 shares · 2025Q4
    Position
  5. Steve Cohen (Point72) added2026-02-17
    +132,465 shares · 2025Q4
    Position
  6. T. Rowe Price added2026-02-17
    +4,736 shares · 2025Q4
    Position
  7. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +25,665 shares · 2025Q4
    Position
  8. Wellington Management trimmed2026-02-17
    −54,580 shares · 2025Q4
    Position
  9. AQR Capital Management added2026-02-17
    +77,589 shares · 2025Q4
    Position
  10. Renaissance Technologies opened position2026-02-12
    +436,200 shares · 2025Q4
    Position
  11. Norges Bank (Norway SWF) opened position2026-02-10
    +1,457,805 shares · 2025Q4
    Position
  12. AQR Capital Management added2025-11-14
    +229,655 shares · 2025Q3
    Position
  13. Izzy Englander (Millennium Mgmt) added2025-11-14
    +123,008 shares · 2025Q3
    Position
  14. T. Rowe Price added2025-11-14
    +7,303 shares · 2025Q3
    Position
  15. Two Sigma Investments trimmed2025-11-14
    −185,458 shares · 2025Q3
    Position
  16. Steve Cohen (Point72) added2025-11-14
    +692,245 shares · 2025Q3
    Position
  17. Wellington Management trimmed2025-11-14
    −1,475,922 shares · 2025Q3
    Position
  18. Ray Dalio (Bridgewater Associates) exited2025-11-13
    −77,321 shares · 2025Q3
    Position
  19. Norges Bank (Norway SWF) exited2025-11-13
    −1,407,943 shares · 2025Q3
    Position
  20. Norges Bank (Norway SWF) added2025-11-12
    +521,421 shares · 2024Q3
    Position

Insider activity

No insider transactions in the last 30 days.
View full insider history for ALGM →

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.
New positions4
Added to6
Trimmed1
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
11
$9.24B
2022Q2
13
$8.13B
2022Q3
12
$13.7M
2022Q4
12
$284.5M
2023Q1
16
$447.4M
2023Q2
14
$499.3M
2023Q3
14
$308.9M
2023Q4
13
$300.2M
2024Q1
12
$307.0M
2024Q2
12
$280.4M
2024Q3
10
$188.0M
2024Q4
10
$130.2M
2025Q1
9
$257.6M
2025Q2
17
$264.6M
2025Q3
11
$116.4M
2025Q4
17
$237.4M

Who owns ALGM

17 super-investors · 2025Q4
Tracked stake
9.10M
shares
Combined value
$237M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New4Added12Trim1
#ManagerSharesValue
1Ken Griffin
Citadel Advisors
2.56M$68M
2Norges Bank
Norway SWF
1.46M$38M
3Izzy Englander
Millennium Mgmt
1.34M$35M
4Steve Cohen
Point72
1.12M$30M
5Wellington Management1.11M$29M
6Renaissance Technologies436.2K$12M
7AQR Capital Management328.0K$9M
8Two Sigma Investments310.9K$8M
9Ken Griffin
Citadel Advisors
142.9K$4M
10D.E. Shaw & Co.55.3K$1M
11Izzy Englander
Millennium Mgmt
43.8K$1M
12Izzy Englander
Millennium Mgmt
27.8K$733K
13Paul Tudor Jones
Tudor Investment
25.7K$677K
14Steve Cohen
Point72
16.2K$427K
15Steve Cohen
Point72
14.5K$383K
16Ken Griffin
Citadel Advisors
12.2K$322K
17T. Rowe Price101.4K$3K

Recent moves

20 transactions
Embed this chart
Paste this iframe anywhere to embed the live ALGM chart.
<iframe src="https://openstocks.me/embed/stock/ALGM" width="100%" height="480" frameborder="0" loading="lazy" title="ALGM chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>
Preview: https://openstocks.me/embed/stock/ALGM