POWI in the 13F filings

Power Integrations Inc · CUSIP 739276103

Sector · Semiconductors Theme · AI infrastructure and semiconductors· L3VLUP-defined Theme · Semiconductors

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024 Q4 2023 Q3 2023

Quarter end: 31 Mar 2026; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 12 May 2026
Managers listing it: 18; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q4 2025 and Q1 2026; 3 listed it in both
Shares listed: 10,848,201; combined, among listed positions
Reported value: $554m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 11 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,300,796.

Managers listing POWI in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

18 of 18 holders

				Action		Filing
Neuberger Berman Group LLC	3,933,099	$201m	0.15%	Trimmed	-39,958	27 Oct 2026 (the filing on sec.gov)
Wellington Management Group LLP	3,356,153	$172m	under 0.1%	Added	+932,181	15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	1,396,483	$72m	under 0.1%	Added	+453,118	15 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP	1,000,000	$51m	0.18%	New	new	13 May 2026 (the filing on sec.gov)
Marshall Wace LLP	360,161	$18m	under 0.1%	Trimmed	-133,547	15 May 2026 (the filing on sec.gov)
Invesco Ltd	280,686	$14m	under 0.1%	Added	+37,833	12 May 2026 (the filing on sec.gov)
AQR Capital Management LLC	137,375	$6.7m	under 0.1%	Trimmed	-146,985	15 May 2026 (the filing on sec.gov)
Citadel Advisors LLC	109,941	$5.6m	under 0.1%	Added	+101,135	15 May 2026 (the filing on sec.gov)
Holocene Advisors LP	87,931	$4.5m	under 0.1%	Added	+14,296	15 May 2026 (the filing on sec.gov)
AllianceBernstein LP	66,892	$2.4m	under 0.1%	Added	+1,374	15 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	26,114	$1.3m	under 0.1%	Held	0	18 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP	23,665	$1.2m	under 0.1%	Trimmed	-72,849	15 May 2026 (the filing on sec.gov)
Two Sigma Investments LP	22,800	$1.2m	under 0.1%	Added	+16,196	15 May 2026 (the filing on sec.gov)
Winton Group Ltd	16,924	$867k	under 0.1%	Trimmed	-3,342	12 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	11,038	$565k	under 0.1%	Added	+3,707	15 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	8,988	$460k	under 0.1%	Trimmed	-432,571	15 May 2026 (the filing on sec.gov)
Man Group PLC	7,609	$390k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP	2,342	$120k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Hudson Bay Capital Management LPnew position · 1,000,000 shares now+1,000,000
Wellington Management Group LLPexisting position · 3,356,153 shares now+932,181
T. Rowe Price Associates Incexisting position · 1,396,483 shares now+453,118
Citadel Advisors LLCexisting position · 109,941 shares now+101,135
Invesco Ltdexisting position · 280,686 shares now+37,833

Reductions

Voloridge Investment Management LLCexisting position · 8,988 shares now-432,571
AQR Capital Management LLCexisting position · 137,375 shares now-146,985
Marshall Wace LLPexisting position · 360,161 shares now-133,547
Susquehanna International Group LLPexisting position · 23,665 shares now-72,849
Neuberger Berman Group LLCexisting position · 3,933,099 shares now-39,958

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (6)

Renaissance Technologies LLCwas $7.3m
Millennium Management LLCwas $3.8m
D. E. Shaw & Co.was $3.1m
Quantbot Technologies LPwas $861k
Brevan Howard Capital Management LPwas $425k
Acadian Asset Management LLCwas $131k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

6 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

POWI by quarter
Quarter	Holders	Reported value	Buyers	Sellers
Q2 2013	3	$127m	n.a.	n.a.
Q3 2013	4	$226m	n.a.	n.a.
Q4 2013	5	$229m	n.a.	n.a.
Q1 2014	5	$384m	n.a.	n.a.
Q2 2014	2	$167m	n.a.	n.a.
Q3 2014	2	$174m	n.a.	n.a.
Q4 2014	2	$175m	n.a.	n.a.
Q1 2015	3	$179m	n.a.	n.a.
Q2 2015	2	$152m	n.a.	n.a.
Q3 2015	2	$142m	n.a.	n.a.
Q4 2015	3	$153m	n.a.	n.a.
Q1 2016	2	$151m	n.a.	n.a.
Q2 2016	3	$155m	n.a.	n.a.
Q3 2016	2	$184m	n.a.	n.a.
Q4 2016	2	$198m	n.a.	n.a.
Q1 2017	2	$205m	n.a.	n.a.
Q2 2017	1	$204m	n.a.	n.a.
Q3 2017	1	$214m	n.a.	n.a.
Q4 2017	2	$220m	n.a.	n.a.
Q1 2018	2	$199m	n.a.	n.a.
Q2 2018	2	$212m	n.a.	n.a.
Q3 2018	2	$186m	n.a.	n.a.
Q4 2018	2	$184m	n.a.	n.a.
Q1 2019	2	$206m	n.a.	n.a.
Q2 2019	2	$230m	n.a.	n.a.
Q3 2019	2	$255m	n.a.	n.a.
Q4 2019	2	$272m	n.a.	n.a.
Q1 2020	5	$234m	n.a.	n.a.
Q2 2020	3	$409m	n.a.	n.a.
Q3 2020	3	$268m	n.a.	n.a.
Q4 2020	4	$684m	n.a.	n.a.
Q1 2021	3	$525m	n.a.	n.a.
Q2 2021	4	$529m	n.a.	n.a.
Q3 2021	5	$838m	n.a.	n.a.
Q4 2021	6	$623m	n.a.	n.a.
Q1 2022	6	$593m	n.a.	n.a.
Q2 2022	6	$475m	n.a.	n.a.
Q3 2022	8	$448m	n.a.	n.a.
Q4 2022	5	$475m	n.a.	n.a.
Q1 2023	6	$518m	n.a.	n.a.
Q2 2023	5	$518m	n.a.	n.a.
Q3 2023	4	$427m	n.a.	n.a.
Q4 2023	4	$437m	2	2
Q1 2024	6	$400m	5	1
Q2 2024	7	$412m	5	2
Q3 2024	6	$429m	6	0
Q4 2024	3	$404m	2	1
Q1 2025	2	$199m	2	0
Q2 2025	3	$241m	3	0
Q3 2025	4	$194m	4	0
Q4 2025	3	$160m	10	20
Q1 2026	4	$429m	11	12
Q2 2026	3	$535m	16	11

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

POWI and NVDA →POWI and AVGO →POWI and MU →Choose a stock to compare with POWI →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own POWI, latest filings →Back to the 13F Explorer →

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