Ticker · CUSIP 739276103

POWI

POWER INTEGRATIONS INC

Technology·Semiconductors

···Share

Holders (tracked)

Combined shares

4,187,178

Combined value

$148.81M

Last close

$58.65

Quarter

2025Q4

Price is +65.0% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$58.65+14.11 (+31.69%)H $58.65 · L $30.59 · Avg Vol 846K

Tracked holders · last 8 quarters

+3 vs previous quarter over the last 8.

SEC event timeline

17 events

AQR Capital Management trimmed2026-02-17
−44,817 shares · 2025Q4
Position
Ken Griffin (Citadel Advisors) trimmed2026-02-17
−21,062 shares · 2025Q4
Position
D.E. Shaw & Co. trimmed2026-02-17
−567,362 shares · 2025Q4
Position
Two Sigma Investments opened position2026-02-17
+6,604 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−41,706 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+895,857 shares · 2025Q4
Position
Wellington Management added2026-02-17
+162,691 shares · 2025Q4
Position
Renaissance Technologies trimmed2026-02-12
−14,300 shares · 2025Q4
Position
AQR Capital Management added2025-11-14
+57,482 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+94,707 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+254,832 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+3,008 shares · 2025Q3
Position
Wellington Management added2025-11-14
+595,404 shares · 2025Q3
Position
Jeremy Grantham (GMO) exited2025-11-13
−460,765 shares · 2025Q3
Position
Renaissance Technologies added2025-11-13
+119,300 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−588,489 shares · 2025Q3
Position
Norges Bank (Norway SWF) added2025-11-12
+113,403 shares · 2024Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for POWI →

Follow-the-investor returns

If you'd copied each holder of POWI…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
T. Rowe Price	2016Q1	$37.60	+56.0%	$55.3M
Ken Griffin (Citadel Advisors)	2016Q1	$39.16	+49.8%	$680K
Ken Griffin (Citadel Advisors)	2016Q1	$39.16	+49.8%	$680K
Ken Griffin (Citadel Advisors)	2016Q1	$39.16	+49.8%	$680K
Renaissance Technologies	2016Q1	$49.76	+17.9%	$12.1M
Izzy Englander (Millennium Mgmt)	2016Q1	$51.80	+13.2%	$6.2M
AQR Capital Management	2016Q2	$57.04	+2.8%	$16.7M
D.E. Shaw & Co.	2016Q1	$57.86	+1.4%	$5.1M
Wellington Management	2016Q1	$59.21	-1.0%	$142.2M
Two Sigma Investments	2016Q2	$64.54	-9.1%	$387K

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions1

Two Sigma Investments
+6,604
$235K

Added to2

Wellington Management
+162,691
$5.8M
T. Rowe Price
+895,857
$32K

Trimmed5

D.E. Shaw & Co.
−567,362
$20.2M
AQR Capital Management
−44,817
$1.6M
Izzy Englander (Millennium Mgmt)
−41,706
$1.5M
Ken Griffin (Citadel Advisors)
−21,062
$749K
Renaissance Technologies
−14,300
$508K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	13	11,965,548	$47.08B	—
2022Q2	13	11,596,257	$36.18B	—
2022Q3	14	12,054,844	$775.4M	+1
2022Q4	14	11,669,447	$836.8M	—
2023Q1	13	11,609,297	$982.5M	-1
2023Q2	12	11,361,124	$1.08B	-1
2023Q3	13	9,343,146	$713.0M	+1
2023Q4	11	9,551,321	$784.3M	-2
2024Q1	12	11,796,007	$844.0M	+1
2024Q2	13	11,854,212	$832.0M	+1
2024Q3	13	5,246,109	$336.4M	—
2024Q4	12	2,031,054	$125.3M	-1
2025Q1	10	3,194,015	$161.2M	-2
2025Q2	9	3,611,323	$201.8M	-1
2025Q3	7	3,691,073	$148.2M	-2
2025Q4	10	4,187,178	$148.8M	+3

Who owns POWI

10 super-investors · 2025Q4

Tracked stake

4.19M

Combined value

$149M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New1Added2Trim7

#	Manager	Shares	Value	% of book	Last action
1	Wellington Management	2.42M	$86M	0.0%	Added+162.7K
2	T. Rowe Price	943.4K	$34M	0.0%	Added+895.9K
3	AQR Capital Management	284.4K	$10M	0.0%	Trim−44.8K
4	Renaissance Technologies	206.1K	$7M	0.0%	Trim−14.3K
5	Ken Griffin Citadel Advisors	108.6K	$4M	0.0%	Trim−21.1K
6	Izzy Englander Millennium Mgmt	106.6K	$4M	0.0%	Trim−41.7K
7	D.E. Shaw & Co.	87.2K	$3M	0.0%	Trim−567.4K
8	Ken Griffin Citadel Advisors	11.6K	$412K	0.0%	Trim−21.1K
9	Ken Griffin Citadel Advisors	8.8K	$313K	0.0%	Trim−21.1K
10	Two Sigma Investments	6.6K	$235K	0.0%	New+6.6K

Recent moves

20 transactions

TRIMAQR Capital Management
−44,817 · 2025Q4
ADDWellington Management
+162,691 · 2025Q4
NEWTwo Sigma Investments
+6,604 · 2025Q4
ADDT. Rowe Price
+895,857 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−21,062 · 2025Q4
TRIMD.E. Shaw & Co.
−567,362 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−41,706 · 2025Q4
TRIMRenaissance Technologies
−14,300 · 2025Q4
ADDAQR Capital Management
+57,482 · 2025Q3
ADDD.E. Shaw & Co.
+254,832 · 2025Q3
ADDWellington Management
+595,404 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+94,707 · 2025Q3
ADDT. Rowe Price
+3,008 · 2025Q3
SOLDNorges Bank (Norway SWF)
−588,489 · 2025Q3
SOLDJeremy Grantham (GMO)
−460,765 · 2025Q3
ADDRenaissance Technologies
+119,300 · 2025Q3
ADDNorges Bank (Norway SWF)
+113,403 · 2024Q3
TRIMWellington Management
−85,042 · 2025Q2
ADDIzzy Englander (Millennium Mgmt)
+14,454 · 2025Q2
TRIMD.E. Shaw & Co.
−69,803 · 2025Q2

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