Mativ Holdings, Inc.
US ˙ NYSE

SecurityMATV / Mativ Holdings, Inc.
InstitutionBoundary Creek Advisors LP
Latest Disclosed Ownership2,188,984 shares
Ownership 4.00%
Boundary Creek Advisors LP ownership in MATV / Mativ Holdings, Inc.

2025-08-06 - Boundary Creek Advisors LP has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,188,984 shares of Mativ Holdings, Inc. (US:MATV). This represents 4.0 percent ownership of the company. In their previous filing dated 2025-05-13 , Boundary Creek Advisors LP had reported owning 2,820,289 shares, indicating a decrease of -22.38 percent.

Boundary Creek Advisors LP has a history of taking positions in derivatives of the underlying security (MATV) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date
Effective
Date
Form Prev
Shares
Latest
Shares
ΔShares
(Percent)
Ownership
(Percent)
ΔOwnership
(Percent)
2025-08-06 2025-08-06 13G/A 2,820,289 2,188,984 -22.38 4.00 -23.08
2025-05-13 2025-05-13 13G/A 3,800,054 2,820,289 -25.78 5.20 -25.71
2024-02-14 2024-02-14 13G 3,800,054 7.00

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MATV / Mativ Holdings, Inc. Historical Put/Call Ratio
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)
2025-11-07 2025-09-30 13F MATIV HOLDINGS COM 808541106 0 -1,313,984 -100.00 0 -100.00
2025-08-12 2025-06-30 13F MATIV HOLDINGS COM 808541106 1,313,984 -631,305 -32.45 8,961 -26.06 1.9622
2025-05-16 2025-03-31 13F MATIV HOLDINGS COM 808541106 1,945,289 -376,116 -16.20 12,119 -52.10 3.2247
2025-02-11 2024-12-31 13F MATIV HOLDINGS COM 808541106 2,321,405 -21,935 -0.94 25,303 -36.45 1.6525
2024-11-08 2024-09-30 13F MATIV HOLDINGS COM 808541106 2,343,340 -367,137 -13.55 39,813 -13.39 3.0958
2024-08-09 2024-06-30 13F MATIV HOLDINGS COM 808541106 2,710,477 -372,522 -12.08 45,970 -20.48 4.1983
2024-05-07 2024-03-31 13F MATIV HOLDINGS COM 808541106 3,082,999 1,893,145 159.11 57,806 217.34 3.4871
2024-02-06 2023-12-31 13F MATIV HOLDINGS COM 808541106 1,189,854 225,378 23.37 18,217 32.45 0.7124
2023-11-13 2023-09-30 13F MATIV HOLDINGS COM 808541106 964,476 321,042 49.90 13,753 41.38 0.5678
2023-08-11 2023-06-30 13F MATIV HOLDINGS COM 808541106 643,434 643,434 9,729 0.4857
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-11-07 2025-09-30 13F MATIV HOLDINGS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-12 2025-06-30 13F MATIV HOLDINGS COM Call 875,000 0.00 5,968 9.47 n/a n/a n/a
2025-05-16 2025-03-31 13F MATIV HOLDINGS COM Call 875,000 -52.38 5,451 -72.78 n/a n/a n/a
2025-02-11 2024-12-31 13F MATIV HOLDINGS COM Call 1,837,500 0.00 20,029 -35.85 n/a n/a n/a
2024-11-08 2024-09-30 13F MATIV HOLDINGS COM Call 1,837,500 47.00 31,219 47.26 n/a n/a n/a
2024-08-09 2024-06-30 13F MATIV HOLDINGS COM Call 1,250,000 -16.67 21,200 -24.62 n/a n/a n/a
2024-05-07 2024-03-31 13F MATIV HOLDINGS COM Call 1,500,000 -42.53 28,125 -29.62 n/a n/a n/a
2024-02-06 2023-12-31 13F MATIV HOLDINGS COM Call 2,610,200 8.46 39,962 16.45 n/a n/a n/a
2023-11-13 2023-09-30 13F MATIV HOLDINGS COM Call 2,406,600 34,318 n/a n/a n/a
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.