ON Semiconductor Corporation
US ˙ NasdaqGS ˙ US6821891057

SecurityON / ON Semiconductor Corporation
InstitutionHeartland Advisors Inc
Latest Disclosed Ownership140,942 shares
Latest Disclosed Value $ 8,727,129
Heartland Advisors Inc reports 30.56% increase in ownership of ON / ON Semiconductor Corporation

On May 6, 2026 - Heartland Advisors Inc filed a 13F-HR form disclosing ownership of 140,942 shares of ON Semiconductor Corporation (US:ON) valued at $8,727,129 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 107,953 shares of ON Semiconductor Corporation. This represents a change in shares of 30.56% during the quarter. The current value of the position is $16,526,859 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)
2026-05-06 2026-03-31 13F ON SEMICONDUCTOR COM 682189105 140,942 32,989 30.56 8,727 49.31 0.4452
2026-02-11 2025-12-31 13F ON SEMICONDUCTOR COM 682189105 107,953 -29 -0.03 5,846 9.79 0.3149
2025-11-07 2025-09-30 13F ON SEMICONDUCTOR COM 682189105 107,982 -96,325 -47.15 5,325 -50.28 0.2813
2025-08-12 2025-06-30 13F ON SEMICONDUCTOR COM 682189105 204,307 -20,175 -8.99 10,708 17.22 0.5970
2025-05-07 2025-03-31 13F ON SEMICONDUCTOR COM 682189105 224,482 4,510 2.05 9,134 -34.14 0.5245
2025-02-12 2024-12-31 13F ON SEMICONDUCTOR COM 682189105 219,972 124,252 129.81 13,869 99.55 0.7538
2024-11-12 2024-09-30 13F ON SEMICONDUCTOR COM 682189105 95,720 95,720 6,950 0.3644
2021-08-11 2021-06-30 13F ON SEMICONDUCTOR COM 682189105 0 -61,485 -100.00 0 -100.00
2021-05-12 2021-03-31 13F ON SEMICONDUCTOR COM 682189105 61,485 -123,161 -66.70 2,558 -57.67 0.1617
2021-02-11 2020-12-31 13F ON SEMICONDUCTOR COM 682189105 184,646 39,862 27.53 6,043 92.45 0.4316
2020-11-12 2020-09-30 13F ON SEMICONDUCTOR COM 682189105 144,784 -992 -0.68 3,140 8.69 0.2732
2020-08-12 2020-06-30 13F ON SEMICONDUCTOR COM 682189105 145,776 98,287 206.97 2,889 388.83 0.2571
2020-05-13 2020-03-31 13F ON SEMICONDUCTOR COM 682189105 47,489 26,382 124.99 591 14.76 0.0631
2020-02-11 2019-12-31 13F ON SEMICONDUCTOR COM 682189105 21,107 8,475 67.09 515 111.93 0.0379
2019-11-12 2019-09-30 13F ON SEMICONDUCTOR COM 682189105 12,632 1,243 10.91 243 5.65 0.0185
2019-08-08 2019-06-30 13F ON SEMICONDUCTOR COM 682189105 11,389 -5,121 -31.02 230 -32.35 0.0169
2019-05-13 2019-03-31 13F ON SEMICONDUCTOR COM 682189105 16,510 1,604 10.76 340 38.21 0.0251
2019-02-12 2018-12-31 13F ON SEMICONDUCTOR COM 682189105 14,906 14,906 246 0.0203
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.