Magnite, Inc.
MX ˙ BMV ˙ US55955D1000
SecurityMX:MGNI / Magnite, Inc.
InstitutionCerity Partners LLC
Latest Disclosed Ownership101,213 shares
Latest Disclosed Value $ 1,202,411
Cerity Partners LLC reports 0.42% increase in ownership of MGNI / Magnite, Inc.

On May 15, 2026 - Cerity Partners LLC filed a 13F-HR form disclosing ownership of 101,213 shares of Magnite, Inc. (MX:MGNI) valued at $1,202,411 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 100,788 shares of Magnite, Inc.. This represents a change in shares of 0.42% 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 101,213 425 0.42 1,202 -26.48 0.0008
2026-02-11 2025-12-31 13F MAGNITE COM 55955D100 100,788 235 0.23 1,636 -25.34 0.0024
2025-10-22 2025-09-30 13F MAGNITE COM 55955D100 100,553 -1,188 -1.17 2,190 -10.72 0.0036
2025-08-13 2025-06-30 13F MAGNITE Stock 55955D100 101,741 1,591 1.59 2,454 114.80 0.0044
2025-04-30 2025-03-31 13F MAGNITE Stock 55955D100 100,150 -394 -0.39 1,143 -28.58 0.0023
2025-02-13 2024-12-31 13F MAGNITE Stock 55955D100 100,544 -2,822 -2.73 1,600 11.74 0.0035
2024-11-12 2024-09-30 13F MAGNITE Stock 55955D100 103,366 -757 -0.73 1,432 3.47 0.0032
2024-08-13 2024-06-30 13F MAGNITE COM 55955D100 104,123 529 0.51 1,384 24.26 0.0036
2024-05-14 2024-03-31 13F MAGNITE Stock 55955D100 103,594 3,094 3.08 1,114 18.66 0.0029
2024-01-26 2023-12-31 13F MAGNITE Stock 55955D100 100,500 -27,329 -21.38 939 -2.60 0.0031
2023-11-14 2023-09-30 13F MAGNITE COM 55955D100 127,829 82,481 181.88 964 55.83 0.0047
2023-08-14 2023-06-30 13F MAGNITE COM 55955D100 45,348 22,542 98.84 619 192.89 0.0024
2023-05-11 2023-03-31 13F MAGNITE COM 55955D100 22,806 11,625 103.97 211 78.81 0.0005
2023-02-15 2022-12-31 13F MAGNITE Stock 55955D100 11,181 1,000 9.82 118 78.79 0.0008
2022-11-14 2022-09-30 13F MAGNITE Stock 55955D100 10,181 10,181 66 0.0008
2022-02-14 2021-12-31 13F Magnite Stock 55955D100 0 -11,848 -100.00 0 -100.00
2021-10-25 2021-09-30 13F Magnite Stock 55955D100 11,848 0 0.00 332 -17.21 0.0073
2021-08-11 2021-06-30 13F MAGNITE Stock 55955D100 11,848 0 0.00 401 -18.66 0.0088
2021-08-11 2021-03-31 13F/A-1 MAGNITE Stock 55955D100 11,848 11,848 493 0.0117
2021-05-12 2021-03-31 13F MAGNITE Stock 55955D100 11,848 11,848 493 0.0146
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.