Magnite, Inc.
MX ˙ BMV ˙ US55955D1000
SecurityMX:MGNI / Magnite, Inc.
InstitutionDiametric Capital, LP
Latest Disclosed Ownership34,783 shares
Latest Disclosed Value $ 413,222
Diametric Capital, LP reports 30.02% decrease in ownership of MGNI / Magnite, Inc.

On May 15, 2026 - Diametric Capital, LP filed a 13F-HR form disclosing ownership of 34,783 shares of Magnite, Inc. (MX:MGNI) valued at $413,222 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 49,704 shares of Magnite, Inc.. This represents a change in shares of -30.02% 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)
2026-05-15 2026-03-31 13F MAGNITE COM 55955D100 34,783 -14,921 -30.02 413 -48.76 0.1074
2026-02-13 2025-12-31 13F MAGNITE COM 55955D100 49,704 28,082 129.88 807 71.49 0.2162
2025-11-13 2025-09-30 13F MAGNITE COM 55955D100 21,622 -11,537 -34.79 471 -41.18 0.1746
2025-08-13 2025-06-30 13F MAGNITE COM 55955D100 33,159 21,912 194.83 800 524.22 0.4267
2025-05-14 2025-03-31 13F MAGNITE COM 55955D100 11,247 -3,974 -26.11 128 -47.11 0.1526
2025-02-12 2024-12-31 13F MAGNITE COM 55955D100 15,221 15,221 242 0.1637
2024-11-13 2024-09-30 13F MAGNITE COM 55955D100 0 -13,424 -100.00 0 -100.00
2024-08-13 2024-06-30 13F MAGNITE COM 55955D100 13,424 13,424 178 0.0968
2022-05-16 2022-03-31 13F Magnite COM 55955D100 0 -14,802 -100.00 0 -100.00
2022-02-14 2021-12-31 13F Magnite COM 55955D100 14,802 14,802 259 0.1983
2021-11-15 2021-09-30 13F Magnite COM 55955D100 0 -9,811 -100.00 0 -100.00
2021-08-16 2021-06-30 13F Magnite COM 55955D100 9,811 9,811 332 0.2398
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.