International Business Machines Corporation
US ˙ NYSE ˙ US4592001014

SecurityIBM / International Business Machines Corporation
InstitutionMairs & Power Inc
Latest Disclosed Ownership3,647 shares
Latest Disclosed Value $ 883,996
Mairs & Power Inc reports 0.55% increase in ownership of IBM / International Business Machines Corporation

On May 13, 2026 - Mairs & Power Inc filed a 13F-HR form disclosing ownership of 3,647 shares of International Business Machines Corporation (US:IBM) valued at $883,996 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,627 shares of International Business Machines Corporation. This represents a change in shares of 0.55% during the quarter. The current value of the position is $1,114,633 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)
2026-05-13 2026-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,647 20 0.55 884 -17.78 0.0090
2026-02-17 2025-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,627 -76 -2.05 1,074 2.87 0.0103
2025-11-14 2025-09-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,703 -71 -1.88 1,045 -6.12 0.0098
2025-08-14 2025-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,774 2,395 173.68 1,112 225.15 0.0110
2025-05-15 2025-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 1,379 262 23.46 343 39.59 0.0036
2025-02-14 2024-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 1,117 100 9.83 246 9.38 0.0024
2024-11-14 2024-09-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 1,017 1,017 225 0.0021
2024-08-14 2024-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 0 -1,117 -100.00 0 -100.00
2024-05-15 2024-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 1,117 -185 -14.21 213 0.47 0.0021
2024-02-14 2023-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 1,302 1,302 213 0.0022
2023-08-14 2023-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 0 -2,162 -100.00 0 -100.00
2023-05-15 2023-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 2,162 -280 -11.47 283 -17.73 0.0033
2023-02-14 2022-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 2,442 0 0.00 344 18.62 0.0041
2022-11-14 2022-09-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 2,442 -866 -26.18 290 -37.90 0.0037
2022-08-15 2022-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,308 -394 -10.64 467 -2.91 0.0056
2022-05-16 2022-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 3,702 -412 -10.01 481 -12.55 0.0048
2022-02-14 2021-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 4,114 -1,221 -22.89 550 -25.78 0.0051
2021-11-15 2021-09-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 5,335 -2,426 -31.26 741 -34.89 0.0074
2021-08-16 2021-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 7,761 -923 -10.63 1,138 -1.64 0.0112
2021-05-14 2021-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 8,684 -1,799 -17.16 1,157 -12.35 0.0121
2021-02-16 2020-12-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 10,483 1,991 23.45 1,320 27.78 0.0147
2020-11-16 2020-09-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 8,492 -5,504 -39.33 1,033 -38.88 0.0129
2020-08-14 2020-06-30 13F INTERNATIONAL BUSINESS MACHS COM 459200101 13,996 -1,630 -10.43 1,690 -2.48 0.0221
2020-05-15 2020-03-31 13F INTERNATIONAL BUSINESS MACHS COM 459200101 15,626 897 6.09 1,733 -12.21 0.0253
2020-02-14 2019-12-31 13F IBM COM 459200101 14,729 -24,606 -62.55 1,974 -65.49 0.0224
2019-11-14 2019-09-30 13F IBM COM 459200101 39,335 0 0.00 5,720 5.46 0.0691
2019-08-14 2019-06-30 13F IBM COM 459200101 39,335 -3,264 -7.66 5,424 -9.77 0.0651
2019-05-15 2019-03-31 13F IBM COM 459200101 42,599 -3,988 -8.56 6,011 13.50 0.0730
2019-02-14 2018-12-31 13F IBM COM 459200101 46,587 -18,754 -28.70 5,296 -46.40 0.0714
2018-11-14 2018-09-30 13F IBM COM 459200101 65,341 -25,661 -28.20 9,880 -22.28 0.1150
2018-08-14 2018-06-30 13F IBM COM 459200101 91,002 -30,903 -25.35 12,713 -32.03 0.1577
2018-05-15 2018-03-31 13F IBM COM 459200101 121,905 -5,963 -4.66 18,704 -4.66 0.2309
2018-02-14 2017-12-31 13F IBM COM 459200101 127,868 -43,224 -25.26 19,618 -20.97 0.2275
2017-11-14 2017-09-30 13F IBM COM 459200101 171,092 -6,537 -3.68 24,822 -9.16 0.2980
2017-08-14 2017-06-30 13F IBM COM 459200101 177,629 -1,324 -0.74 27,325 -12.32 0.3303
2017-05-15 2017-03-31 13F IBM COM 459200101 178,953 -3,920 -2.14 31,163 2.66 0.3818
2017-02-14 2016-12-31 13F IBM COM 459200101 182,873 -3,628 -1.95 30,355 2.46 0.3897
2016-11-14 2016-09-30 13F IBM COM 459200101 186,501 -10,304 -5.24 29,626 -0.82 0.3905
2016-08-15 2016-06-30 13F IBM COM 459200101 196,805 -2,102 -1.06 29,871 -0.84 0.4032
2016-05-16 2016-03-31 13F IBM COM 459200101 198,907 835 0.42 30,124 10.51 0.4282
2016-02-16 2015-12-31 13F IBM COM 459200101 198,072 -6,017 -2.95 27,259 -7.87 0.4086
2015-11-16 2015-09-30 13F IBM COM 459200101 204,089 -12,091 -5.59 29,587 -15.86 0.4625
2015-08-14 2015-06-30 13F IBM COM 459200101 216,180 149 0.07 35,164 1.42 0.4978
2015-05-15 2015-03-31 13F IBM COM 459200101 216,031 3,319 1.56 34,673 1.60 0.4769
2015-02-17 2014-12-31 13F IBM COM 459200101 212,712 14,042 7.07 34,128 -9.51 0.4736
2014-11-14 2014-09-30 13F IBM COM 459200101 198,670 14,498 7.87 37,714 12.97 0.5504
2014-08-14 2014-06-30 13F IBM COM 459200101 184,172 16,215 9.65 33,385 3.26 0.4734
2014-05-15 2014-03-31 13F IBM COM 459200101 167,957 63,829 61.30 32,330 65.53 0.4791
2014-02-14 2013-12-31 13F IBM COM 459200101 104,128 16,178 18.39 19,531 19.92 0.3005
2013-11-14 2013-09-30 13F IBM COM 459200101 87,950 -347 -0.39 16,287 -3.48 0.2814
2013-08-14 2013-06-30 13F IBM COM 459200101 88,297 88,297 16,874 0.3225
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.