Mativ Holdings, Inc.
US ˙ NYSE

SecurityMATV / Mativ Holdings, Inc.
InstitutionBoston Partners
Latest Disclosed Ownership404,721 shares
Latest Disclosed Value $ 3,521,070
Boston Partners reports 36.98% increase in ownership of MATV / Mativ Holdings, Inc.

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 404,721 shares of Mativ Holdings, Inc. (US:MATV) valued at $3,521,073 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 295,462 shares of Mativ Holdings, Inc.. This represents a change in shares of 36.98% during the quarter. The current value of the position is $3,067,785 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)
2026-05-11 2026-03-31 13F MATIV HOLDINGS COM 808541106 404,721 109,259 36.98 3,521 -1.89 0.0037
2026-02-13 2025-12-31 13F MATIV HOLDINGS COM 808541106 295,462 81,352 38.00 3,590 48.24 0.0037
2025-11-13 2025-09-30 13F MATIV HOLDINGS COM 808541106 214,110 214,110 2,422 0.0025
2023-11-08 2023-09-30 13F MATIV HOLDINGS COM 808541106 0 -1,232,165 -100.00 0 -100.00
2023-08-10 2023-06-30 13F MATIV HOLDINGS COM 808541106 1,232,165 -55,713 -4.33 19,083 -29.62 0.0257
2023-05-09 2023-03-31 13F MATIV HOLDINGS COM 808541106 1,287,878 4,848 0.38 27,114 -3.50 0.0373
2023-02-08 2022-12-31 13F MATIV HOLDINGS COM 808541106 1,283,030 165,836 14.84 28,097 13.02 0.0380
2022-11-09 2022-09-30 13F MATIV HOLDINGS COM 808541106 1,117,194 -15,661 -1.38 24,860 -10.94 0.0364
2022-08-10 2022-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,132,855 -17,141 -1.49 27,913 -11.11 0.0390
2022-05-10 2022-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,149,996 23,675 2.10 31,402 -7.30 0.0380
2022-02-04 2021-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,126,321 -10,108 -0.89 33,875 -14.28 0.0408
2021-11-05 2021-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,136,429 -13,962 -1.21 39,517 -14.57 0.0501
2021-08-12 2021-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,150,391 -30,047 -2.55 46,254 -19.67 0.0590
2021-05-10 2021-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,180,438 -22,951 -1.91 57,577 18.99 0.0772
2021-02-10 2020-12-31 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,203,389 -108,714 -8.29 48,388 21.35 0.0753
2021-02-04 2020-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,203,389 -108,714 48,388 29,029.9239
2020-11-13 2020-09-30 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,312,103 -127,310 -8.84 39,875 -16.93 0.0726
2020-11-09 2020-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,439,413 0 48,001 35,238.4520
2020-08-12 2020-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,439,413 87,300 6.46 48,001 27.77 0.0882
2020-05-13 2020-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,352,113 193,838 16.74 37,567 -22.65 0.0746
2020-02-06 2019-12-31 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,158,275 -6,291 -0.54 48,569 10.85 0.0642
2020-02-05 2019-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,158,275 -6,291 48,569 27,306.9103
2019-11-20 2019-09-30 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,164,566 -389,907 -25.08 43,815 -15.04 0.0593
2019-11-08 2019-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,554,947 474 52,314 0.0692
2019-08-26 2019-06-30 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,554,473 230,355 17.40 51,569 0.58 0.0676
2019-08-09 2019-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,554,473 230,355 51,569
2019-05-13 2019-03-31 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,324,118 209,830 18.83 51,270 83.68 0.0679
2019-05-03 2019-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,324,118 209,830 51,270
2019-02-07 2018-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,114,288 115,695 11.59 27,913 -27.04 0.0401
2018-11-14 2018-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 998,593 -72,149 -6.74 38,256 -18.28 0.0445
2018-08-03 2018-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,070,742 14,671 1.39 46,813 13.23 0.0561
2018-05-04 2018-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,056,071 -56,128 -5.05 41,345 -18.05 0.0499
2018-02-14 2017-12-31 13F/A-1 SCHWEITZER-MAUDUIT INTL COM 808541106 1,112,199 192,842 20.98 50,449 32.36 0.0594
2018-02-01 2017-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 1,112,199 192,842 50,449
2017-11-02 2017-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 919,357 241,771 35.68 38,116 51.10 0.0471
2017-08-02 2017-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 677,586 61,359 9.96 25,226 -1.17 0.0321
2017-05-03 2017-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 616,227 -17,312 -2.73 25,525 -11.51 0.0326
2017-02-06 2016-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 633,539 -344,294 -35.21 28,845 -23.50 0.0379
2016-11-09 2016-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 977,833 -20,642 -2.07 37,705 7.03 0.0527
2016-08-05 2016-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 998,475 75,478 8.18 35,227 21.24 0.0509
2016-05-12 2016-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 922,997 404,495 78.01 29,056 33.46 0.0428
2016-02-08 2015-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 518,502 39,979 8.35 21,772 32.34 0.0312
2015-11-10 2015-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 478,523 11,362 2.43 16,452 -11.70 0.0251
2015-08-10 2015-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 467,161 168,904 56.63 18,631 35.44 0.0268
2015-05-05 2015-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 298,257 -5,547 -1.83 13,756 7.04 0.0205
2015-02-09 2014-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 303,804 -9,084 -2.90 12,851 -0.58 0.0193
2014-11-12 2014-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 312,888 254,605 436.84 12,926 407.90 0.0210
2014-08-08 2014-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 58,283 0 0.00 2,545 2.54 0.0043
2014-05-07 2014-03-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 58,283 -85 -0.15 2,482 -17.38 0.0045
2014-02-06 2013-12-31 13F SCHWEITZER-MAUDUIT INTL COM 808541106 58,368 -995 -1.68 3,004 -16.39 0.0062
2013-11-12 2013-09-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 59,363 -1,485 -2.44 3,593 18.39 0.0087
2013-08-01 2013-06-30 13F SCHWEITZER-MAUDUIT INTL COM 808541106 60,848 60,848 3,035 0.0084
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.