WESCO International, Inc.
MX ˙ BMV ˙ US95082P1057
SecurityMX:WCC / WESCO International, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership127,405 shares
Latest Disclosed Value $ 34,860,508
Rhumbline Advisers reports 2.21% increase in ownership of WCC / WESCO International, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 127,405 shares of WESCO International, Inc. (MX:WCC) valued at $34,860,508 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 124,652 shares of WESCO International, Inc.. This represents a change in shares of 2.21% during the quarter.

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)
2026-05-12 2026-03-31 13F WESCO INTERNATIONAL COM 95082P105 127,405 2,753 2.21 34,861 14.32 0.0298
2026-02-13 2025-12-31 13F WESCO INTERNATIONAL COM 95082P105 124,652 -3,339 -2.61 30,495 12.65 0.0247
2025-11-06 2025-09-30 13F WESCO INTERNATIONAL COM 95082P105 127,991 5,961 4.88 27,070 19.78 0.0217
2025-08-12 2025-06-30 13F WESCO INTERNATIONAL COM 95082P105 122,030 2,665 2.23 22,600 21.91 0.0194
2025-05-29 2025-03-31 13F/A-1 WESCO INTERNATIONAL COM 95082P105 119,365 -1,037 -0.86 18,537 -14.92 0.0173
2025-04-08 2025-03-31 13F WESCO INTERNATIONAL COM 95082P105 119,365 -1,037 18,537 0.0173
2025-05-29 2024-12-31 13F/A-1 WESCO INTERNATIONAL COM 95082P105 120,402 2,271 1.92 21,788 9.80 0.0195
2025-01-30 2024-12-31 13F WESCO INTERNATIONAL COM 95082P105 120,402 2,271 21,788 0.0195
2024-11-12 2024-09-30 13F WESCO INTERNATIONAL COM 95082P105 118,131 -1,728 -1.44 19,844 4.44 0.0179
2024-08-01 2024-06-30 13F WESCO INTERNATIONAL COM 95082P105 119,859 -2,100 -1.72 19,000 -9.04 0.0179
2024-05-09 2024-03-31 13F WESCO INTERNATIONAL COM 95082P105 121,959 -4,499 -3.56 20,889 -5.00 0.0201
2024-02-08 2023-12-31 13F WESCO INTERNATIONAL COM 95082P105 126,458 -4,122 -3.16 21,988 17.09 0.0230
2023-11-09 2023-09-30 13F WESCO INTERNATIONAL COM 95082P105 130,580 -3,805 -2.83 18,780 -21.96 0.0218
2023-08-08 2023-06-30 13F WESCO INTERNATIONAL COM 95082P105 134,385 83,703 165.15 24,063 343,642.86 0.0270
2023-05-11 2023-03-31 13F WESCO INTERNATIONAL COM 95082P105 50,682 1,807 3.70 8 -99.89 0.0097
2023-02-14 2022-12-31 13F WESCO INTERNATIONAL COM 95082P105 48,875 2,604 5.63 6,119 10.77 0.0082
2022-11-10 2022-09-30 13F WESCO INTERNATIONAL COM 95082P105 46,271 3,346 7.79 5,524 20.17 0.0082
2022-08-11 2022-06-30 13F WESCO INTERNATIONAL COM 95082P105 42,925 -13,463 -23.88 4,597 -37.35 0.0067
2022-05-12 2022-03-31 13F WESCO INTERNATIONAL COM 95082P105 56,388 -3,478 -5.81 7,338 -6.85 0.0094
2022-02-10 2021-12-31 13F WESCO INTERNATIONAL COM 95082P105 59,866 -2,734 -4.37 7,878 9.13 0.0097
2021-11-12 2021-09-30 13F WESCO INTERNATIONAL COM 95082P105 62,600 -1,341 -2.10 7,219 9.81 0.0098
2021-08-05 2021-06-30 13F WESCO INTERNATIONAL COM 95082P105 63,941 -16,524 -20.54 6,574 -5.59 0.0086
2021-05-06 2021-03-31 13F WESCO INTERNATIONAL COM 95082P105 80,465 -7,411 -8.43 6,963 0.94 0.0095
2021-02-10 2020-12-31 13F WESCO INTERNATIONAL COM 95082P105 87,876 9,527 12.16 6,898 100.00 0.0095
2020-11-12 2020-09-30 13F WESCO INTERNATIONAL COM 95082P105 78,349 -21,481 -21.52 3,449 -1.60 0.0054
2020-08-13 2020-06-30 13F WESCO INTERNATIONAL COM 95082P105 99,830 54,550 120.47 3,505 238.65 0.0059
2020-05-06 2020-03-31 13F WESCO INTERNATIONAL COM 95082P105 45,280 9,730 27.37 1,035 -50.97 0.0022
2020-02-05 2019-12-31 13F WESCO INTERNATIONAL COM 95082P105 35,550 182 0.51 2,111 24.91 0.0035
2019-10-23 2019-09-30 13F WESCO INTERNATIONAL COM 95082P105 35,368 743 2.15 1,690 -3.65 0.0031
2019-08-14 2019-06-30 13F WESCO INTERNATIONAL COM 95082P105 34,625 -1,921 -5.26 1,754 -9.45 0.0033
2019-05-01 2019-03-31 13F WESCO INTERNATIONAL COM 95082P105 36,546 -6,618 -15.33 1,937 -6.52 0.0038
2019-01-31 2018-12-31 13F WESCO INTERNATIONAL COM 95082P105 43,164 1,432 3.43 2,072 -19.19 0.0045
2018-11-07 2018-09-30 13F WESCO INTERNATIONAL COM 95082P105 41,732 349 0.84 2,564 8.51 0.0050
2018-08-06 2018-06-30 13F WESCO INTERNATIONAL COM 95082P105 41,383 -1,879 -4.34 2,363 -11.96 0.0048
2018-05-02 2018-03-31 13F WESCO INTERNATIONAL COM 95082P105 43,262 -1,291 -2.90 2,684 -11.59 0.0056
2018-02-09 2017-12-31 13F WESCO INTERNATIONAL COM 95082P105 44,553 -106 -0.24 3,036 16.72 0.0062
2017-11-06 2017-09-30 13F WESCO INTERNATIONAL COM 95082P105 44,659 -22 -0.05 2,601 1.60 0.0057
2017-08-02 2017-06-30 13F WESCO INTERNATIONAL COM 95082P105 44,681 -3,736 -7.72 2,560 -23.97 0.0058
2017-05-02 2017-03-31 13F WESCO INTERNATIONAL COM 95082P105 48,417 3,066 6.76 3,367 11.56 0.0079
2017-01-27 2016-12-31 13F WESCO INTERNATIONAL COM 95082P105 45,351 9,385 26.09 3,018 36.44 0.0076
2016-11-08 2016-09-30 13F WESCO INTERNATIONAL COM 95082P105 35,966 2,666 8.01 2,212 28.98 0.0061
2016-08-11 2016-06-30 13F WESCO INTERNATIONAL COM 95082P105 33,300 1,842 5.86 1,715 -0.29 0.0051
2016-05-02 2016-03-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 31,458 120 0.38 1,720 25.64 0.0053
2016-02-03 2015-12-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 31,338 348 1.12 1,369 -4.93 0.0044
2015-11-04 2015-09-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 30,990 1,021 3.41 1,440 -30.00 0.0049
2015-08-04 2015-06-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 29,969 -1,546 -4.91 2,057 -6.63 0.0066
2015-05-12 2015-03-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 31,515 400 1.29 2,203 -7.09 0.0064
2015-02-06 2014-12-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 31,115 -6,290 -16.82 2,371 -19.00 0.0069
2014-11-12 2014-09-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 37,405 -80 -0.21 2,927 -9.60 0.0088
2014-08-06 2014-06-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 37,485 -4,778 -11.31 3,238 -7.93 0.0095
2014-05-06 2014-03-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 42,263 -210 -0.49 3,517 -9.07 0.0104
2014-02-03 2013-12-31 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 42,473 6,629 18.49 3,868 41.01 0.0114
2013-11-05 2013-09-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 35,844 2,305 6.87 2,743 20.36 0.0085
2013-08-07 2013-06-30 13F WESCO INTERNATIONAL INC COMMON COM 95082P105 33,539 33,539 2,279 0.0073
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.