Power Solutions International, Inc.
US ˙ NasdaqCM ˙ US73933G2021

SecurityPSIX / Power Solutions International, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership80,099 shares
Latest Disclosed Value $ 4,876,427
Northern Trust Corp reports 2.20% increase in ownership of PSIX / Power Solutions International, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 80,099 shares of Power Solutions International, Inc. (US:PSIX) valued at $4,876,427 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 78,375 shares of Power Solutions International, Inc.. This represents a change in shares of 2.20% during the quarter. The current value of the position is $3,218,378 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)
2026-05-14 2026-03-31 13F POWER SOLUTIONS INTL COM NEW 73933G202 80,099 1,724 2.20 4,876 8.89 0.0001
2026-02-17 2025-12-31 13F POWER SOLUTIONS INTL COM NEW 73933G202 78,375 13,506 20.82 4,478 -29.71 0.0001
2025-11-14 2025-09-30 13F POWER SOLUTIONS INTL COM NEW 73933G202 64,869 17,040 35.63 6,371 105.98 0.0002
2025-08-13 2025-06-30 13F POWER SOLUTIONS INTL COM NEW 73933G202 47,829 36,696 329.61 3,094 1,000.71 0.0004
2025-05-13 2025-03-31 13F POWER SOLUTIONS INTL COM NEW 73933G202 11,133 11,133 281 0.0000
2017-08-11 2017-06-30 13F POWER SOLUTIONS INTL COM 73933G202 0 -54,097 -100.00 0 -100.00
2017-05-12 2017-03-31 13F POWER SOLUTIONS INTL COM 73933G202 54,097 -536 -0.98 546 33.17 0.0002
2017-02-13 2016-12-31 13F POWER SOLUTIONS INTL COM 73933G202 54,633 3,140 6.10 410 -22.20 0.0001
2016-11-09 2016-09-30 13F POWER SOLUTIONS INTL COM 73933G202 51,493 1,675 3.36 527 -40.72 0.0002
2016-08-12 2016-06-30 13F POWER SOLUTIONS INTL COM 73933G202 49,818 -1,367 -2.67 889 23.64 0.0003
2016-08-19 2016-03-31 13F/A-1 POWER SOLUTIONS INTL COM NEW 73933G202 51,185 -126 -0.25 719 -23.27 0.0002
2016-05-13 2016-03-31 13F Power Solutions Intl In COMM 73933G202 51,185 706
2016-02-12 2015-12-31 13F Power Solutions Intl In COMM 73933G202 51,311 -19,756 -27.80 937 -41.98 0.0003
2015-11-12 2015-09-30 13F POWER SOLUTIONS INTL COM 73933G202 71,067 71,067 0.00 1,615 0.0005
2015-08-13 2015-06-30 13F Power Solutions Intl In COMM 73933G202 0 -69,669 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Power Solutions Intl In COMM 73933G202 69,669 249 0.36 4,479 25.01 0.0013
2015-02-12 2014-12-31 13F Power Solutions Intl In COM 73933G202 69,420 12,471 21.90 3,583 -8.83 0.0011
2014-11-13 2014-09-30 13F Power Solutions Intl In COMM 73933G202 56,949 20,301 55.39 3,930 49.03 0.0012
2014-08-14 2014-06-30 13F POWER SOLUTIONS INTL com 73933G202 36,648 4,400 13.64 2,637 8.79 0.0008
2014-05-14 2014-03-31 13F POWER SOLUTIONS INTL COMM 73933G202 32,248 -1,455 -4.32 2,424 -4.23 0.0008
2014-02-21 2013-12-31 13F/A-1 POWER SOLUTIONS INTL COM 73933G202 33,703 1,313 4.05 2,531 32.17 0.0008
2014-02-12 2013-12-31 13F POWER SOLUTIONS INTL COM 73933G202 33,703 2,531
2013-11-13 2013-09-30 13F POWER SOLUTIONS INTL COM 73933G202 32,390 24,124 291.85 1,915 591.34 0.0007
2013-08-09 2013-06-30 13F POWER SOLUTIONS INTL COM 73933G202 8,266 8,266 277 0.0001
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.