Power Integrations, Inc.
US ˙ NasdaqGS ˙ US7392761034

SecurityPOWI / Power Integrations, Inc.
InstitutionBoston Trust Walden Corp
Latest Disclosed Ownership577,605 shares
Latest Disclosed Value $ 29,573,376
Boston Trust Walden Corp reports 10.69% decrease in ownership of POWI / Power Integrations, Inc.

On April 24, 2026 - Boston Trust Walden Corp filed a 13F-HR form disclosing ownership of 577,605 shares of Power Integrations, Inc. (US:POWI) valued at $29,573,376 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 646,744 shares of Power Integrations, Inc.. This represents a change in shares of -10.69% during the quarter. The current value of the position is $49,090,649 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-24 2026-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 577,605 -69,139 -10.69 29,573 28.66 0.1454
2026-01-28 2025-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 646,744 -56,496 -8.03 22,985 -18.71 0.1040
2025-10-17 2025-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 703,240 -10,659 -1.49 28,277 -29.14 0.2075
2025-07-28 2025-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 713,899 -19,848 -2.71 39,907 7.70 0.2846
2025-04-21 2025-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 733,747 -5,537 -0.75 37,054 -18.76 0.2707
2025-01-24 2024-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 739,284 -30,077 -3.91 45,614 -7.54 0.3201
2024-10-24 2024-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 769,361 -21,875 -2.76 49,331 -11.17 0.3432
2024-07-19 2024-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 791,236 -944 -0.12 55,537 -2.02 0.4119
2024-04-22 2024-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 792,180 -878 -0.11 56,680 -12.96 0.4043
2024-01-24 2023-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 793,058 3,784 0.48 65,118 8.12 0.4913
2023-10-18 2023-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 789,274 49,396 6.68 60,229 -14.01 0.5048
2023-07-24 2023-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 739,878 21,218 2.95 70,044 15.15 0.5745
2023-04-19 2023-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 718,660 25,503 3.68 60,827 22.36 0.5250
2023-01-20 2022-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 693,157 -5,509 -0.79 49,713 10.63 0.4371
2022-10-19 2022-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 698,666 23,466 3.48 44,938 -11.27 0.4452
2022-07-22 2022-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 675,200 55,267 8.91 50,647 -11.85 0.4786
2022-04-20 2022-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 619,933 118,344 23.59 57,456 23.32 0.4746
2022-01-21 2021-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 501,589 4,020 0.81 46,592 -5.40 0.3741
2021-10-25 2021-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 497,569 11,951 2.46 49,254 23.60 0.4361
2021-07-22 2021-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 485,618 -15,836 -3.16 39,850 -2.47 0.3543
2021-04-21 2021-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 501,454 -1,581 -0.31 40,859 -0.77 0.3957
2021-01-15 2020-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 503,035 2,005 0.40 41,178 48.35 0.4393
2020-10-14 2020-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 501,030 260,769 108.54 27,757 -2.20 0.3457
2020-07-23 2020-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 240,261 23,307 10.74 28,382 48.11 0.3832
2020-04-24 2020-03-31 13F/A-1 POWER INTEGRATIONS COMMON STOCK 739276103 216,954 17,921 9.00 19,163 -2.66 0.3054
2020-04-21 2020-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 216,954 17,921 19,163 169,924.1296
2020-01-10 2019-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 199,033 3,373 1.72 19,687 11.26 0.2291
2019-10-21 2019-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 195,660 1,127 0.58 17,694 13.44 0.2224
2019-07-25 2019-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 194,533 -3,148 -1.59 15,597 12.82 0.2030
2019-04-16 2019-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 197,681 3,078 1.58 13,825 16.50 0.1882
2019-01-17 2018-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 194,603 -9,760 -4.78 11,867 -8.12 0.1888
2018-10-23 2018-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 204,363 -12,096 -5.59 12,916 -18.32 0.1779
2018-07-25 2018-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 216,459 -5,303 -2.39 15,813 4.32 0.2320
2018-04-13 2018-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 221,762 -15,078 -6.37 15,158 -12.99 0.2300
2018-01-29 2017-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 236,840 8,531 3.74 17,420 4.24 0.2554
2017-10-13 2017-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 228,309 -3,225 -1.39 16,712 -0.98 0.2602
2017-07-19 2017-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 231,534 -69,042 -22.97 16,878 -14.60 0.2712
2017-04-24 2017-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 300,576 -34,348 -10.26 19,763 -13.03 0.3080
2017-02-07 2016-12-31 13F/A-1 POWER INTEGRATIONS COMMON STOCK 739276103 334,924 -13,575 -3.90 22,724 3.45 0.3582
2017-02-01 2016-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 334,924 22,724
2016-10-17 2016-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 348,499 -604 -0.17 21,966 25.66 0.3621
2016-08-09 2016-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 349,103 -46,590 -11.77 17,480 -11.04 0.2986
2016-04-19 2016-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 395,693 -4,765 -1.19 19,650 0.90 0.3421
2016-01-21 2015-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 400,458 -137,092 -25.50 19,475 -14.09 0.3612
2015-10-29 2015-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 537,550 -22,429 -4.01 22,668 -10.40 0.3786
2015-07-17 2015-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 559,979 -9,892 -1.74 25,300 -14.75 0.3858
2015-04-15 2015-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 569,871 569,871 0.00 29,679 0.4406
2015-01-28 2014-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 0 -747,778 -100.00 0 -100.00
2014-10-23 2014-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 747,778 -22,350 -2.90 40,313 -9.03 0.6226
2014-08-01 2014-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 770,128 -55,217 -6.69 44,313 -18.38 0.6440
2014-04-11 2014-03-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 825,345 -41,986 -4.84 54,291 12.14 0.8064
2014-02-11 2013-12-31 13F POWER INTEGRATIONS COMMON STOCK 739276103 867,331 -238,603 -21.57 48,414 -19.17 0.7063
2013-11-15 2013-09-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 1,105,934 -12,206 -1.09 59,898 32.08 0.9165
2013-08-08 2013-06-30 13F POWER INTEGRATIONS COMMON STOCK 739276103 1,118,140 1,118,140 45,351 0.7322
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.