Mattel, Inc.
US ˙ NasdaqGS ˙ US5770811025

SecurityMAT / Mattel, Inc.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership362,496 shares
Latest Disclosed Value $ 5,267,067
Walleye Capital LLC ownership in MAT / Mattel, Inc.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 362,496 shares of Mattel, Inc. (US:MAT) valued at $5,267,067 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,042 shares of Mattel, Inc.. This represents a change in shares of 34,688.48% during the quarter. The current value of the position is $5,103,944 USD.

Walleye Capital LLC has a history of taking positions in derivatives of the underlying security (MAT) in the form of stock options. The firm currently holds call options representing 4,300 of underlying shares valued at $62,479 USD and put 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: 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.

MAT / Mattel, 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)
2026-05-13 2026-03-31 13F/A-1 MATTEL COM 577081102 362,496 361,454 34,688.48 5,267 26,235.00 0.0219
2026-05-08 2026-03-31 13F MATTEL COM 577081102 362,496 361,454 5,267 0.0219
2026-02-13 2025-12-31 13F MATTEL COM 577081102 1,042 -439,853 -99.76 21 -99.73 0.0001
2025-11-14 2025-09-30 13F MATTEL COM 577081102 440,895 394,760 855.66 7,420 716.28 0.0278
2025-08-13 2025-06-30 13F MATTEL COM 577081102 46,135 39,716 618.73 910 633.06 0.0035
2025-05-14 2025-03-31 13F MATTEL COM 577081102 6,419 -342,960 -98.16 125 -98.00 0.0006
2025-02-13 2024-12-31 13F MATTEL COM 577081102 349,379 250,771 254.31 6,194 229.82 0.0151
2024-11-14 2024-09-30 13F MATTEL COM 577081102 98,608 70,486 250.64 1,878 310.94 0.0039
2024-08-14 2024-06-30 13F MATTEL COM 577081102 28,122 -210,090 -88.19 457 -90.31 0.0008
2024-05-15 2024-03-31 13F MATTEL COM 577081102 238,212 238,212 4,719 0.0084
2024-02-14 2023-12-31 13F MATTEL COM 577081102 0 -75,790 -100.00 0 -100.00
2023-11-21 2023-09-30 13F/A-1 MATTEL COM 577081102 75,790 48,224 174.94 1,670 210.22 0.0043
2023-11-14 2023-09-30 13F MATTEL COM 577081102 75,790 48,224 1,670 0.0043
2023-08-14 2023-06-30 13F MATTEL COM 577081102 27,566 27,566 539 0.0020
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
(%)
2026-05-13 2026-03-31 13F/A MATTEL COM Call 4,300 -62.61 62 -72.81 n/a n/a n/a
2026-05-08 2026-03-31 13F MATTEL COM Call 4,300 62 n/a n/a n/a
2026-02-13 2025-12-31 13F MATTEL COM Call 11,500 228 n/a n/a n/a
2025-11-14 2025-09-30 13F MATTEL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-13 2025-06-30 13F MATTEL COM Call 5,600 -26.32 110 -25.17 n/a n/a n/a
2025-05-14 2025-03-31 13F MATTEL COM Call 7,600 -98.26 148 -98.10 n/a n/a n/a
2025-02-13 2024-12-31 13F MATTEL COM Call 435,800 -2.77 7,727 -9.51 n/a n/a n/a
2024-11-14 2024-09-30 13F MATTEL COM Call 448,200 2.80 8,538 20.44 n/a n/a n/a
2024-08-14 2024-06-30 13F MATTEL COM Call 436,000 2,526.51 7,089 2,061.28 n/a n/a n/a
2024-05-15 2024-03-31 13F MATTEL COM Call 16,600 -63.36 329 -61.64 n/a n/a n/a
2024-02-14 2023-12-31 13F MATTEL COM Call 45,300 -11.18 855 -23.86 n/a n/a n/a
2023-11-21 2023-09-30 13F/A MATTEL COM Call 51,000 1,124 n/a n/a n/a
2023-11-14 2023-09-30 13F MATTEL COM Call 51,000 1,124 n/a n/a n/a
2020-02-14 2019-12-31 13F MATTEL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-11-14 2019-09-30 13F MATTEL COM Call 13,300 -82.50 151 -82.28 n/a n/a n/a
2019-08-14 2019-06-30 13F MATTEL COM Call 76,000 852 n/a n/a n/a
Disclosed Put 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
(%)
2026-05-13 2026-03-31 13F/A MATTEL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-05-08 2026-03-31 13F MATTEL COM Put 0 0 n/a n/a n/a
2026-02-13 2025-12-31 13F MATTEL COM Put 9,100 181 n/a n/a n/a
2025-11-14 2025-09-30 13F MATTEL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-13 2025-06-30 13F MATTEL COM Put 5,600 -69.06 110 -68.66 n/a n/a n/a
2025-05-14 2025-03-31 13F MATTEL COM Put 18,100 -26.12 352 -19.12 n/a n/a n/a
2025-02-13 2024-12-31 13F MATTEL COM Put 24,500 -33.42 434 -38.09 n/a n/a n/a
2024-11-14 2024-09-30 13F MATTEL COM Put 36,800 -83.24 701 -80.36 n/a n/a n/a
2024-08-14 2024-06-30 13F MATTEL COM Put 219,600 138.96 3,571 96.15 n/a n/a n/a
2024-05-15 2024-03-31 13F MATTEL COM Put 91,900 -0.11 1,821 4.84 n/a n/a n/a
2024-02-14 2023-12-31 13F MATTEL COM Put 92,000 -15.90 1,737 -27.97 n/a n/a n/a
2023-11-21 2023-09-30 13F/A MATTEL COM Put 109,400 1,440.85 2,410 1,646.38 n/a n/a n/a
2023-11-14 2023-09-30 13F MATTEL COM Put 109,400 2,410 n/a n/a n/a
2023-08-14 2023-06-30 13F MATTEL COM Put 7,100 139 n/a n/a n/a
2020-02-14 2019-12-31 13F MATTEL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-11-14 2019-09-30 13F MATTEL COM Put 11,300 -18.71 129 -17.31 n/a n/a n/a
2019-08-14 2019-06-30 13F MATTEL COM Put 13,900 156 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.