Magnite, Inc.
MX ˙ BMV ˙ US55955D1000
SecurityMX:MGNI / Magnite, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership926,819 shares
Latest Disclosed Value $ 11,010,613
Morgan Stanley reports 50.24% decrease in ownership of MGNI / Magnite, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 926,819 shares of Magnite, Inc. (MX:MGNI) valued at $11,010,613 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,862,538 shares of Magnite, Inc.. This represents a change in shares of -50.24% 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 926,819 -935,719 -50.24 11,011 -63.58 0.0007
2026-05-27 2025-12-31 13F/A-1 MAGNITE COM 55955D100 1,862,538 -183,699 -8.98 30,229 -32.17 0.0018
2026-02-13 2025-12-31 13F MAGNITE COM 55955D100 1,862,538 -183,699 30,229 0.0018
2026-05-27 2025-09-30 13F/A-1 MAGNITE COM 55955D100 2,046,237 875,682 74.81 44,567 57.85 0.0027
2025-11-14 2025-09-30 13F MAGNITE COM 55955D100 2,046,237 875,682 44,567 0.0027
2025-08-15 2025-06-30 13F MAGNITE COM 55955D100 1,170,555 294,696 33.65 28,234 182.53 0.0018
2025-05-15 2025-03-31 13F MAGNITE COM 55955D100 875,859 -324,035 -27.01 9,994 -47.69 0.0007
2025-05-15 2024-12-31 13F/A-1 MAGNITE COM 55955D100 1,199,894 339,263 39.42 19,102 60.27 0.0013
2025-02-14 2024-12-31 13F MAGNITE COM 55955D100 1,199,894 339,263 19,102 0.0013
2025-05-14 2024-09-30 13F/A-2 MAGNITE COM 55955D100 860,631 137,380 18.99 11,920 24.00 0.0009
2025-02-14 2024-09-30 13F/A-1 MAGNITE COM 55955D100 860,631 137,380 11,920 0.0009
2024-11-14 2024-09-30 13F MAGNITE COM 55955D100 860,631 137,380 11,920 0.0001
2025-05-14 2024-06-30 13F/A-2 MAGNITE COM 55955D100 723,251 -128,095 -15.05 9,612 5.04 0.0007
2024-10-17 2024-06-30 13F/A-1 MAGNITE COM 55955D100 723,251 -128,095 9,612 0.0007
2024-08-14 2024-06-30 13F MAGNITE COM 55955D100 723,251 -128,095 9,612 0.0007
2024-10-17 2024-03-31 13F/A-2 MAGNITE COM 55955D100 851,346 127,212 17.57 9,152 35.31 0.0007
2024-08-16 2024-03-31 13F/A-1 MAGNITE COM 55955D100 851,346 127,212 9,152 0.0001
2024-05-15 2024-03-31 13F MAGNITE COM 55955D100 851,346 127,212 9,152 0.0007
2024-08-16 2023-12-31 13F/A-1 MAGNITE COM 55955D100 724,134 338,536 87.80 6,763 132.65 0.0006
2024-02-13 2023-12-31 13F MAGNITE COM 55955D100 724,134 338,536 6,763 0.0006
2023-11-15 2023-09-30 13F MAGNITE COM 55955D100 385,598 -206,301 -34.85 2,907 -64.02 0.0003
2023-08-14 2023-06-30 13F MAGNITE COM 55955D100 591,899 42,692 7.77 8,079 58.88 0.0008
2023-05-15 2023-03-31 13F MAGNITE COM 55955D100 549,207 -351,172 -39.00 5,086 -46.67 0.0005
2023-02-14 2022-12-31 13F MAGNITE COM 55955D100 900,379 55,709 6.60 9,535 71.83 0.0011
2022-11-14 2022-09-30 13F MAGNITE COM 55955D100 844,670 60,431 7.71 5,549 -20.33 0.0008
2022-10-27 2022-06-30 13F/A-1 MAGNITE COM 55955D100 784,239 -133,446 -14.54 6,965 -42.55 0.0009
2022-08-15 2022-06-30 13F MAGNITE COM 55955D100 784,239 -133,446 6,965 0.0002
2022-10-27 2022-03-31 13F/A-1 MAGNITE COM 55955D100 917,685 318,426 53.14 12,123 15.60 0.0016
2022-05-13 2022-03-31 13F MAGNITE COM 55955D100 917,685 318,426 12,123 0.0016
2022-02-14 2021-12-31 13F MAGNITE COM 55955D100 599,259 -353,099 -37.08 10,487 -60.67 0.0013
2021-11-15 2021-09-30 13F MAGNITE COM 55955D100 952,358 -466,386 -32.87 26,665 -44.46 0.0036
2021-08-23 2021-06-30 13F/A-1 MAGNITE COM 55955D100 1,418,744 457,886 47.65 48,010 20.08 0.0063
2021-08-16 2021-06-30 13F MAGNITE COM 55955D100 1,418,744 457,886 48,010 0.0063
2021-05-17 2021-03-31 13F MAGNITE COM 55955D100 960,858 17,003 1.80 39,982 37.94 0.0059
2021-02-16 2020-12-31 13F MAGNITE COM 55955D100 943,855 703,717 293.05 28,986 1,637.77 0.0045
2020-11-13 2020-09-30 13F MAGNITE COM 55955D100 240,138 240,138 1,668 0.0003
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.