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MGNI · SPCX in the 13F filings

Two to four stocks side by side among the 95 tracked managers: who lists them, how that has moved, who bought and sold in a quarter, and which managers hold more than one.

MGNISPCX
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

Holders over time

Tracked managers listing each stock every quarter, at least, or their combined reported value. A gap is a quarter in which no tracked manager listed it. Click a quarter to compare there.
  • MGNI
  • SPCX
020406020212022202320252026
Holders and value by quarter
QuarterMGNISPCX
Q4 20201 holders, $5.7mnone listed holders, n.a.
Q1 20212 holders, $94mnone listed holders, n.a.
Q2 20215 holders, $88mnone listed holders, n.a.
Q3 20213 holders, $43mnone listed holders, n.a.
Q4 20214 holders, $38mnone listed holders, n.a.
Q1 20221 holders, $1.2mnone listed holders, n.a.
Q2 20222 holders, $1.9mnone listed holders, n.a.
Q3 20223 holders, $5.4mnone listed holders, n.a.
Q4 20221 holders, $4.2mnone listed holders, n.a.
Q1 20232 holders, $3.1mnone listed holders, n.a.
Q2 20232 holders, $6.6mnone listed holders, n.a.
Q3 20231 holders, $1.7mnone listed holders, n.a.
Q2 20241 holders, $21mnone listed holders, n.a.
Q3 20241 holders, $50mnone listed holders, n.a.
Q4 20242 holders, $129mnone listed holders, n.a.
Q1 20253 holders, $163mnone listed holders, n.a.
Q2 20256 holders, $520mnone listed holders, n.a.
Q3 20252 holders, $165mnone listed holders, n.a.
Q4 20254 holders, $367mnone listed holders, n.a.
Q1 20263 holders, $84mnone listed holders, n.a.
Q2 20265 holders, $104m42 holders, $105bn
MGNI

Magnite Inc

Holders
2
Reported value
$165m
Buyers
0
Sellers
3

Breadth -3 among 95 comparable managers.

Software and IT servicesInternet, programming and data services
SPCX

Space Exploration Techn Corp

Holders
0
Reported value
$0
Buyers
n.a.
Sellers
n.a.

No cross-section for this quarter.

Software and IT servicesInternet, programming and data services

Who holds both, Q3 2025

Among the 2 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Both (0)

No tracked manager lists every one of them.

Only MGNI (2)

Capital Research Global Investors, First Eagle Investment Management LLC

Only SPCX (0)

None.

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. Buyers and sellers count comparable managers (those that filed both quarters) by shares, so a rise in value with no rise in shares is the price. Large books are listed to their largest positions. These are 95 tracked managers, not the institutional market.

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