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Power Integrations Inc

POWI
Exchange
Nasdaq
Industry
Semiconductors & Related Devices
SEC CIK
0000833640

No open-market purchases or sales by Power Integrations Inc insiders were filed in the last 90 days; 375 institutions reported holding it in 13F filings for Q2 2026, worth $5.24B in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
4.73M
Shares, settlement Oct 30, 2026
Change
−429.8K
−8.3% vs. Oct 15, 2026
Days to cover
6.65
Short interest ÷ average daily volume
Average daily volume
711.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 3,997,834 sharesNov 15, 2024: 3,961,637 sharesNov 29, 2024: 3,867,125 sharesDec 13, 2024: 3,863,659 sharesDec 31, 2024: 3,781,660 sharesJan 15, 2025: 3,587,909 sharesJan 31, 2025: 3,367,639 sharesFeb 14, 2025: 3,268,167 sharesFeb 28, 2025: 3,789,955 sharesMar 14, 2025: 3,896,063 sharesMar 31, 2025: 3,877,199 sharesApr 15, 2025: 4,034,994 sharesApr 30, 2025: 4,000,221 sharesMay 15, 2025: 3,618,789 sharesMay 30, 2025: 3,688,481 sharesJun 13, 2025: 2,716,490 sharesJun 30, 2025: 2,661,211 sharesJul 15, 2025: 2,428,138 sharesJul 31, 2025: 2,830,790 sharesAug 15, 2025: 2,395,658 sharesAug 29, 2025: 2,550,673 sharesSep 15, 2025: 2,473,563 sharesSep 30, 2025: 2,492,593 sharesOct 15, 2025: 3,930,339 sharesOct 31, 2025: 3,700,314 sharesNov 14, 2025: 4,181,892 sharesNov 28, 2025: 4,101,544 sharesDec 15, 2025: 4,153,504 sharesDec 31, 2025: 4,759,463 sharesJan 15, 2026: 5,146,137 sharesJan 30, 2026: 4,383,038 sharesFeb 13, 2026: 4,048,976 sharesFeb 27, 2026: 4,469,101 sharesMar 13, 2026: 4,905,458 sharesMar 31, 2026: 4,777,527 sharesApr 15, 2026: 4,143,862 sharesApr 30, 2026: 4,361,662 sharesMay 15, 2026: 4,002,506 sharesMay 29, 2026: 4,566,868 sharesJun 15, 2026: 4,716,260 sharesJun 30, 2026: 4,676,081 sharesJul 15, 2026: 5,476,352 sharesJul 31, 2026: 5,565,877 sharesAug 14, 2026: 5,531,780 sharesAug 31, 2026: 5,675,387 sharesSep 15, 2026: 5,878,245 sharesSep 30, 2026: 5,484,575 sharesOct 15, 2026: 5,161,894 sharesOct 30, 2026: 4,732,092 shares
Short interest in POWI by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20264.73M−429.8K−8.3%711.1K6.65
Oct 15, 20265.16M−322.7K−5.9%732.0K7.05
Sep 30, 20265.48M−393.7K−6.7%827.4K6.63
Sep 15, 20265.88M+202.9K+3.6%873.0K6.73
Aug 31, 20265.68M+143.6K+2.6%696.9K8.14
Aug 14, 20265.53M−34.1K−0.6%603.2K9.17
Jul 31, 20265.57M+89.5K+1.6%672.0K8.28
Jul 15, 20265.48M+800.3K+17.1%790.8K6.92
Jun 30, 20264.68M−40.2K−0.9%1.14M4.11
Jun 15, 20264.72M+149.4K+3.3%1.09M4.32
May 29, 20264.57M+564.4K+14.1%1.75M2.61
May 15, 20264.00M−359.2K−8.2%1.30M3.08
Apr 30, 20264.36M+217.8K+5.3%1.35M3.24
Apr 15, 20264.14M−633.7K−13.3%676.5K6.13
Mar 31, 20264.78M−127.9K−2.6%954.0K5.01
Mar 13, 20264.91M+436.4K+9.8%1.02M4.83
Feb 27, 20264.47M+420.1K+10.4%666.5K6.71
Feb 13, 20264.05M−334.1K−7.6%1.03M3.92
Jan 30, 20264.38M−763.1K−14.8%922.2K4.75
Jan 15, 20265.15M+386.7K+8.1%880.8K5.84
Dec 31, 20254.76M+606.0K+14.6%1.60M2.97
Dec 15, 20254.15M+52.0K+1.3%836.6K4.96
Nov 28, 20254.10M−80.3K−1.9%862.5K4.76
Nov 14, 20254.18M+481.6K+13.0%996.0K4.20
Oct 31, 20253.70M−230.0K−5.9%1.11M3.32
Oct 15, 20253.93M+1.44M+57.7%2.20M1.79
Sep 30, 20252.49M+19.0K+0.8%706.6K3.53
Sep 15, 20252.47M−77.1K−3.0%583.7K4.24
Aug 29, 20252.55M+155.0K+6.5%525.0K4.86
Aug 15, 20252.40M−435.1K−15.4%781.1K3.07
Jul 31, 20252.83M+402.7K+16.6%490.2K5.78
Jul 15, 20252.43M−233.1K−8.8%386.6K6.28
Jun 30, 20252.66M−55.3K−2.0%443.4K6.00
Jun 13, 20252.72M−972.0K−26.4%572.4K4.75
May 30, 20253.69M+69.7K+1.9%473.2K7.79
May 15, 20253.62M−381.4K−9.5%649.0K5.58
Apr 30, 20254.00M−34.8K−0.9%460.2K8.69
Apr 15, 20254.03M+157.8K+4.1%836.9K4.82
Mar 31, 20253.88M−18.9K−0.5%455.9K8.51
Mar 14, 20253.90M+106.1K+2.8%592.4K6.58
Feb 28, 20253.79M+521.8K+16.0%723.5K5.24
Feb 14, 20253.27M−99.5K−3.0%458.8K7.12
Jan 31, 20253.37M−220.3K−6.1%469.1K7.18
Jan 15, 20253.59M−193.8K−5.1%389.6K9.21
Dec 31, 20243.78M−82.0K−2.1%354.3K10.67
Dec 13, 20243.86M−3.47K−0.1%336.8K11.47
Nov 29, 20243.87M−94.5K−2.4%359.7K10.75
Nov 15, 20243.96M−36.2K−0.9%518.9K7.63
Oct 31, 20244.00M+701.5K+21.3%282.8K14.14

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in POWI by settlement date
Settlement dateSharesPriceValue
Oct 5, 2026985$54.46$53.6K
Oct 1, 2026883$51.80$45.7K
Sep 30, 20263$51.08$153.24
Sep 29, 202689$51.84$4.61K
Sep 28, 20265,024$52.22$262.4K
Sep 4, 20265,903$50.54$298.3K
Sep 2, 202649$49.78$2.44K
Aug 31, 2026919$51.51$47.3K
Aug 26, 202636,300$54.63$1.98M
Aug 5, 202694$64.57$6.07K
Aug 3, 202699$60.71$6.01K
Jul 30, 2026398$56.57$22.5K
Jul 27, 2026114$63.46$7.23K
Jul 24, 2026278$70.87$19.7K
Jul 22, 2026187$74.39$13.9K
Jul 20, 2026682$70.45$48.0K
Jul 17, 202622$69.84$1.54K
Jul 16, 2026639$71.02$45.4K
Jul 15, 2026195$70.76$13.8K
Jul 14, 20261,612$69.44$111.9K
Jul 13, 20261,241$72.07$89.4K
Jul 10, 20261,246$70.83$88.3K
Jul 9, 202611$66.46$731.06
Jul 2, 2026117$80.27$9.39K
Jun 30, 20263,305$78.96$261.0K
Jun 29, 2026215,836$79.37$17.1M
Jun 26, 202635$84.81$2.97K
Jun 25, 2026840$81.86$68.8K
Jun 18, 20268,947$80.73$722.3K
Jun 12, 202631,942$77.76$2.48M

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in POWI by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026180,24855266,42167.7%
Nov 9, 2026260,571372354,83373.4%
Nov 6, 2026236,6658,799444,79653.2%
Nov 5, 2026702,88010,022906,95977.5%
Nov 4, 2026176,7960232,98875.9%
Nov 3, 2026206,975353271,38076.3%
Nov 2, 2026175,5822,550478,57136.7%
Oct 30, 2026245,0491,714561,51743.6%
Oct 29, 2026134,1480178,32475.2%
Oct 28, 2026172,8690252,36068.5%
Oct 27, 202687,7420181,25748.4%
Oct 26, 2026133,5750171,33178.0%
Oct 23, 2026189,3680306,66161.8%
Oct 22, 2026301,7530354,54785.1%
Oct 21, 2026119,9560183,72165.3%
Oct 20, 2026147,5150210,10870.2%
Oct 19, 2026252,4560337,70074.8%
Oct 16, 2026271,5680335,53780.9%
Oct 15, 2026260,194157524,31849.6%
Oct 14, 2026211,51280428,32249.4%
Oct 13, 2026141,45760439,27732.2%
Oct 12, 2026134,9340184,21273.2%
Oct 9, 202694,353692140,56567.1%
Oct 8, 2026145,23520213,69968.0%
Oct 7, 2026126,764630172,64873.4%
Oct 6, 2026147,9990211,70169.9%
Oct 5, 2026142,0304200,34170.9%
Oct 2, 2026196,470373370,44453.0%
Oct 1, 2026126,53127350,37936.1%
Sep 30, 2026193,0540431,43244.7%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in POWI
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2668,65124,478383,6096,58763.5%
Sep 28, 2026T21,418,99529,681817,0788,45363.5%
Sep 21, 2026T2994,01927,036561,2337,33563.9%
Sep 14, 2026T2998,58530,797632,6135,61261.2%
Sep 7, 2026T2754,47221,749498,0695,55060.2%
Aug 31, 2026T21,439,25229,823471,0458,42475.3%
Aug 24, 2026T21,251,74330,127389,7317,07576.3%
Aug 17, 2026T21,176,29033,942384,5026,15975.4%
Aug 10, 2026T2757,35422,694269,1115,02973.8%
Aug 3, 2026T21,143,13836,143569,6277,50366.7%
Jul 27, 2026T21,239,21730,704336,6647,76978.6%
Jul 20, 2026T2823,37828,069265,5265,66075.6%