Masco Corporation
MX ˙ BMV ˙ US5745991068
SecurityMX:MAS / Masco Corporation
InstitutionBoston Partners
Latest Disclosed Ownership4,492,021 shares
Latest Disclosed Value $ 271,162,085
Boston Partners reports 21.62% decrease in ownership of MAS / Masco Corporation

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 4,492,021 shares of Masco Corporation (MX:MAS) valued at $271,162,085 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 5,731,244 shares of Masco Corporation. This represents a change in shares of -21.62% 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)
2026-05-11 2026-03-31 13F MASCO COM 574599106 4,492,021 -1,239,223 -21.62 271,162 -25.47 0.1214
2026-02-13 2025-12-31 13F MASCO COM 574599106 5,731,244 -118,926 -2.03 363,837 -11.65 0.3767
2025-11-13 2025-09-30 13F MASCO COM 574599106 5,850,170 58,609 1.01 411,832 10.45 0.4228
2025-08-12 2025-06-30 13F/A-1 MASCO COM 574599106 5,791,561 810,881 16.28 372,859 7.69 0.4141
2025-08-07 2025-06-30 13F MASCO COM 574599106 5,789,215 808,535 372,708 0.1711
2025-05-13 2025-03-31 13F MASCO COM 574599106 4,980,680 -2,792,454 -35.92 346,236 -38.72 0.4187
2025-02-11 2024-12-31 13F MASCO COM 574599106 7,773,134 -1,211,448 -13.48 564,990 -25.09 0.6872
2024-11-12 2024-09-30 13F MASCO COM 574599106 8,984,582 -84,443 -0.93 754,207 24.60 0.8901
2024-08-14 2024-06-30 13F MASCO COM 574599106 9,069,025 1,135,414 14.31 605,279 -3.07 0.7519
2024-05-28 2024-03-31 13F/A-1 MASCO COM 574599106 7,933,611 -1,246,753 -13.58 624,439 1.49 0.7438
2024-05-13 2024-03-31 13F MASCO COM 574599106 7,933,611 -1,246,753 624,439 0.3090
2024-02-07 2023-12-31 13F MASCO COM 574599106 9,180,364 159,052 1.76 615,282 27.68 0.8149
2023-11-08 2023-09-30 13F MASCO COM 574599106 9,021,312 359,562 4.15 481,875 -3.13 0.6671
2023-08-10 2023-06-30 13F MASCO COM 574599106 8,661,750 -48,436 -0.56 497,428 14.66 0.6696
2023-05-09 2023-03-31 13F MASCO COM 574599106 8,710,186 -1,339,845 -13.33 433,832 -7.94 0.5964
2023-02-08 2022-12-31 13F MASCO COM 574599106 10,050,031 1,786,398 21.62 471,236 22.31 0.6375
2022-11-09 2022-09-30 13F MASCO COM 574599106 8,263,633 3,936,601 90.98 385,282 75.93 0.5639
2022-08-10 2022-06-30 13F MASCO COM 574599106 4,327,032 514,528 13.50 219,000 12.64 0.3061
2022-05-10 2022-03-31 13F MASCO COM 574599106 3,812,504 573,854 17.72 194,433 -14.50 0.2355
2022-02-04 2021-12-31 13F MASCO COM 574599106 3,238,650 -79,525 -2.40 227,402 23.36 0.2739
2021-11-05 2021-09-30 13F MASCO COM 574599106 3,318,175 102,311 3.18 184,340 -2.69 0.2335
2021-08-12 2021-06-30 13F MASCO COM 574599106 3,215,864 77,429 2.47 189,442 0.74 0.2416
2021-05-10 2021-03-31 13F MASCO COM 574599106 3,138,435 -337,912 -9.72 188,046 -1.52 0.2522
2021-02-10 2020-12-31 13F/A-1 MASCO COM 574599106 3,476,347 41,583 1.21 190,955 0.84 0.2970
2021-02-04 2020-12-31 13F MASCO COM 574599106 3,476,347 41,583 190,955 114,561.6499
2020-11-13 2020-09-30 13F/A-1 MASCO COM 574599106 3,434,764 -1,289 -0.04 189,359 9.76 0.3448
2020-11-09 2020-09-30 13F MASCO COM 574599106 3,436,053 0 172,524 126,653.1674
2020-08-12 2020-06-30 13F MASCO COM 574599106 3,436,053 -134,338 -3.76 172,524 39.80 0.3169
2020-05-13 2020-03-31 13F MASCO COM 574599106 3,570,391 511,420 16.72 123,405 -15.94 0.2451
2020-02-06 2019-12-31 13F/A-1 MASCO COM 574599106 3,058,971 1,850 0.06 146,804 15.15 0.1942
2020-02-05 2019-12-31 13F MASCO COM 574599106 3,058,971 1,850 146,804 82,537.4965
2019-11-20 2019-09-30 13F/A-1 MASCO COM 574599106 3,057,121 -1,395,806 -31.35 127,487 -27.04 0.1726
2019-11-08 2019-09-30 13F MASCO COM 574599106 4,451,507 -1,420 174,776 0.2312
2019-08-26 2019-06-30 13F/A-1 MASCO COM 574599106 4,452,927 -676,260 -13.18 174,728 -13.34 0.2291
2019-08-09 2019-06-30 13F MASCO COM 574599106 4,453,014 -676,173 174,732
2019-05-13 2019-03-31 13F/A-1 MASCO COM 574599106 5,129,187 -3,340,426 -39.44 201,628 -18.58 0.2671
2019-05-03 2019-03-31 13F MASCO COM 574599106 5,129,187 -3,340,426 201,628
2019-02-07 2018-12-31 13F MASCO COM 574599106 8,469,613 -1,632,790 -16.16 247,651 -33.02 0.3558
2018-11-14 2018-09-30 13F MASCO COM 574599106 10,102,403 1,072,964 11.88 369,748 9.43 0.4296
2018-08-03 2018-06-30 13F MASCO COM 574599106 9,029,439 -225,585 -2.44 337,881 -9.72 0.4050
2018-05-04 2018-03-31 13F MASCO COM 574599106 9,255,024 46,458 0.50 374,273 -7.50 0.4513
2018-02-14 2017-12-31 13F/A-1 MASCO COM 574599106 9,208,566 -3,647,724 -28.37 404,625 -19.32 0.4767
2018-02-01 2017-12-31 13F MASCO COM 574599106 9,208,566 -3,647,724 404,625
2017-11-02 2017-09-30 13F MASCO COM 574599106 12,856,290 -746,360 -5.49 501,524 -3.51 0.6197
2017-08-02 2017-06-30 13F MASCO COM 574599106 13,602,650 4,714,941 53.05 519,757 72.05 0.6609
2017-05-03 2017-03-31 13F MASCO COM 574599106 8,887,709 611,363 7.39 302,093 15.44 0.3857
2017-02-06 2016-12-31 13F MASCO COM 574599106 8,276,346 -1,288,192 -13.47 261,698 -20.25 0.3441
2016-11-09 2016-09-30 13F MASCO COM 574599106 9,564,538 -2,084,274 -17.89 328,159 -8.95 0.4589
2016-08-05 2016-06-30 13F MASCO COM 574599106 11,648,812 661,151 6.02 360,414 4.30 0.5208
2016-05-12 2016-03-31 13F MASCO COM 574599106 10,987,661 882,338 8.73 345,562 20.83 0.5090
2016-02-08 2015-12-31 13F MASCO COM 574599106 10,105,323 -17,380 -0.17 285,981 12.20 0.4097
2015-11-10 2015-09-30 13F MASCO COM 574599106 10,122,703 399,757 4.11 254,890 -1.70 0.3885
2015-08-10 2015-06-30 13F MASCO COM 574599106 9,722,946 1,346,815 16.08 259,311 15.95 0.3725
2015-05-05 2015-03-31 13F MASCO COM 574599106 8,376,131 964,231 13.01 223,643 19.74 0.3330
2015-02-09 2014-12-31 13F MASCO COM 574599106 7,411,900 1,007,412 15.73 186,780 21.92 0.2803
2014-11-12 2014-09-30 13F MASCO COM 574599106 6,404,488 -1,368,649 -17.61 153,196 -11.22 0.2486
2014-08-08 2014-06-30 13F MASCO COM 574599106 7,773,137 557,978 7.73 172,563 7.68 0.2890
2014-05-07 2014-03-31 13F MASCO COM 574599106 7,215,159 1,882,605 35.30 160,249 31.98 0.2923
2014-02-06 2013-12-31 13F MASCO COM 574599106 5,332,554 773,282 16.96 121,422 25.15 0.2489
2013-11-12 2013-09-30 13F MASCO COM 574599106 4,559,272 549,304 13.70 97,021 24.14 0.2340
2013-08-01 2013-06-30 13F MASCO COM 574599106 4,009,968 4,009,968 78,154 0.2152
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.