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IRDM · CMCSA 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.

IRDMCMCSA
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.
  • IRDM
  • CMCSA
010203040202120222023202420252026
Holders and value by quarter
QuarterIRDMCMCSA
Q3 20203 holders, $228m32 holders, $40.8bn
Q4 20203 holders, $450m35 holders, $45.9bn
Q1 20215 holders, $524m38 holders, $49.8bn
Q2 20213 holders, $621m34 holders, $52.9bn
Q3 20214 holders, $555m33 holders, $51.4bn
Q4 20214 holders, $511m37 holders, $45.2bn
Q1 20225 holders, $199m38 holders, $40.3bn
Q2 20226 holders, $186m39 holders, $32.1bn
Q3 20227 holders, $200m37 holders, $22.8bn
Q4 20228 holders, $216m28 holders, $25.4bn
Q1 20236 holders, $257m26 holders, $28.7bn
Q2 20237 holders, $356m25 holders, $29.4bn
Q3 20238 holders, $228m32 holders, $30.6bn
Q4 20235 holders, $169m25 holders, $28.6bn
Q1 20248 holders, $170m26 holders, $26.8bn
Q2 20242 holders, $94m28 holders, $24.1bn
Q3 20247 holders, $144m33 holders, $27.0bn
Q4 20243 holders, $81m29 holders, $24.1bn
Q1 20253 holders, $140m33 holders, $24.1bn
Q2 20252 holders, $170m34 holders, $22.3bn
Q3 20253 holders, $150m34 holders, $18.9bn
Q4 20256 holders, $108m33 holders, $20.0bn
Q1 20264 holders, $109m28 holders, $20.1bn
Q2 20268 holders, $561m29 holders, $16.2bn
IRDM

Iridium Communications Inc

Holders
8
Reported value
$561m
Buyers
17
Sellers
18

Breadth -1 among 91 comparable managers.

Communications and media
CMCSA

Comcast Corp New

Holders
29
Reported value
$16.2bn
Buyers
23
Sellers
24

Breadth -1 among 91 comparable managers.

Communications and media

Who holds both, Q2 2026

Among the 32 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only IRDM (3)

ARK Investment Management LLC, Moore Capital Management LP, Renaissance Technologies LLC

Only CMCSA (24)

Acadian Asset Management LLC, AllianceBernstein LP, Arrowstreet Capital LP, Artisan Partners LP, Bridgewater Associates LP, Capital Research Global Investors, Capital World Investors, Caxton Associates LLP, Davidson Kempner Capital Management LP, Dodge & Cox, Fidelity (FMR LLC), First Eagle Investment Management LLC, Freestone Grove Partners LP, GAMCO Investors Inc, Greenlight Capital, Harris Associates LP, Invesco Ltd, Markel Group Inc, MFS Investment Management, Point72 Asset Management LP, Schonfeld Strategic Advisors LLC, Two Sigma Investments LP, Verition Fund Management LLC, Woodline Partners LP

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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