Het observatorium

World's largest asset manager — Mostly passive/ETF assets — read size, not conviction.

49,968 posities · top-10 28.1% · +196 nieuw · −154 exits

SPDR ETF sponsor — Passive giant; index flows dominate changes.

4,177 posities · top-10 29.1% · +42 nieuw · −103 exits

Fidelity Investments' manager — Active + index fund complex.

13,978 posities · top-10 34.0% · +235 nieuw · −147 exits

Bank/wealth platform — Bank-affiliated adviser aggregating client assets.

45,905 posities · top-10 21.1% · +213 nieuw · −162 exits

Manages Fidelity index funds — Passive manager for Fidelity-branded index funds.

8,470 posities · top-10 31.1% · +112 nieuw · −140 exits

Bank asset & wealth management — Bank-affiliated manager; broad book.

34,064 posities · top-10 26.3% · +375 nieuw · −202 exits

Bank asset & wealth management — Bank-affiliated manager; broad book.

14,070 posities · top-10 22.6% · +377 nieuw · −354 exits

Norway's sovereign wealth fund (NBIM) — The world's largest sovereign equity owner; near-index breadth.

1,617 posities · top-10 32.4% · +1602 nieuw

Active fund complex — Large active growth manager.

4,722 posities · top-10 32.3% · +215 nieuw · −111 exits

Ken Griffin (Founder & CEO) — Multi-strategy platform; heavy reported options activity — read positions with care.

16,127 posities · top-10 15.9% · +1090 nieuw · −898 exits

Capital Group division — American Funds' long-only equity.

637 posities · top-10 29.6% · +63 nieuw · −55 exits

Institutional asset manager — One of the largest active institutional managers.

7,448 posities · top-10 25.0% · +210 nieuw · −159 exits

Ken Fisher (Founder) — Large RIA managing many separate accounts — breadth over conviction.

1,037 posities · top-10 35.6% · +121 nieuw · −96 exits

Warren Buffett (Chairman & CEO) — The holding company's reported U.S. equity book; famously concentrated and long-held.

89 posities · top-10 88.5% · +1 nieuw · −1 exits

Cliff Asness (Co-founder) — Systematic factor investing across thousands of names.

21,077 posities · top-10 12.2% · +237 nieuw · −77 exits

Izzy Englander (Founder) — Multi-manager pod platform; aggregate positions reflect many independent teams.

5,798 posities · top-10 19.4% · +494 nieuw · −533 exits

Quantitative institutional manager — Systematic global equity.

1,887 posities · top-10 27.7% · +373 nieuw · −298 exits

Founded by David E. Shaw — Quantitative multi-strategy manager.

6,298 posities · top-10 20.2% · +510 nieuw · −280 exits

Value mutual-fund manager — Long-only value funds; positions turn over slowly.

222 posities · top-10 27.9% · +7 nieuw · −6 exits

Sub-adviser to Vanguard funds — Long-duration growth positions.

324 posities · top-10 42.5% · +10 nieuw · −6 exits

Founded by John Overdeck & David Siegel — Quantitative manager; broad, fast-turning book.

5,017 posities · top-10 8.4% · +547 nieuw · −334 exits

London long/short platform — Systematic + discretionary long/short.

6,550 posities · top-10 40.5% · +641 nieuw · −604 exits

Edinburgh growth manager — Long-horizon growth investing.

880 posities · top-10 44.7% · +28 nieuw · −24 exits

Steve Cohen (Founder) — Multi-manager platform with discretionary pods.

3,923 posities · top-10 14.8% · +613 nieuw · −605 exits

Manager of the Oakmark funds — Long-only value funds.

226 posities · top-10 31.5% · +12 nieuw · −7 exits

Founded by Jim Simons — Quantitative manager holding thousands of positions; single names carry little signal.

3,140 posities · top-10 12.0% · +506 nieuw · −566 exits

Manages Harvard-lineage capital — Low-profile, benchmark-aware stock picking.

1,002 posities · top-10 29.5% · +130 nieuw · −108 exits

Chris Hohn (Founder) — Very concentrated, long-duration positions.

11 posities · top-10 98.6% · +2 nieuw · −1 exits

Philippe Laffont (Founder) — Technology-focused crossover manager.

211 posities · top-10 61.9% · +9 nieuw · −5 exits

Joel Greenblatt (Co-CIO) — Systematic value; hundreds of small long positions.

1,791 posities · top-10 28.4% · +174 nieuw · −125 exits

Founded by Andreas Halvorsen — Fundamental long/short equity.

90 posities · top-10 35.7% · +32 nieuw · −21 exits

Endowment trust — Concentrated endowment portfolio.

24 posities · top-10 94.9% · +2 nieuw

Founded by Ray Dalio — One of the largest macro managers; the 13F shows only its reportable U.S. long book.

997 posities · top-10 40.0% · +212 nieuw · −208 exits

Chase Coleman (Founder) — Growth/technology crossover investing.

46 posities · top-10 67.1% · +9 nieuw · −15 exits

Paul Singer (Founder) — Activist positions often paired with derivatives that 13Fs only partially reveal.

29 posities · top-10 95.6% · +2 nieuw · −2 exits

Founded by Stephen Mandel — Growth-oriented long/short equity.

34 posities · top-10 53.9% · +13 nieuw · −15 exits

Cathie Wood (CEO) — Thematic ETF manager — its 13F largely mirrors its funds' disclosed holdings.

191 posities · top-10 39.5% · +15 nieuw · −6 exits

Insurance holding company — Buffett-style equity book inside an insurer.

205 posities · top-10 42.9% · +3 nieuw · −2 exits

Mario Gabelli (Chairman) — Value manager with many small-cap holdings.

938 posities · top-10 15.4% · +34 nieuw · −97 exits

Brad Gerstner (Founder) — Technology-focused crossover manager.

20 posities · top-10 83.3% · +9 nieuw · −2 exits

Carl Icahn — Activist positions, often alongside 13D filings.

18 posities · top-10 98.6%

Family office of George Soros — Macro-driven family office.

266 posities · top-10 29.3% · +83 nieuw · −78 exits

David Tepper (President) — Opportunistic, macro-aware equity positioning.

27 posities · top-10 81.6% · +6 nieuw · −12 exits

Co-founded by Howard Marks — Credit specialist; the 13F shows only its listed-equity sliver.

145 posities · top-10 66.5% · +8 nieuw · −11 exits

Founded by Jeff Ubben; led by Mason Morfit — Constructive activist with board seats.

18 posities · top-10 88.2% · +1 nieuw · −1 exits

Larry Robbins (CEO) — Healthcare-heavy fundamental manager.

45 posities · top-10 64.1% · +12 nieuw · −11 exits

Seth Klarman (CEO) — Value investor; much of the portfolio (cash, credit, private) never appears in a 13F.

23 posities · top-10 74.9% · +3 nieuw · −2 exits

Stanley Druckenmiller (Chairman) — Macro-aware equity family office.

95 posities · top-10 52.4% · +44 nieuw · −23 exits

Daniel Loeb (CEO) — Event-driven and activist equity manager.

43 posities · top-10 60.6% · +14 nieuw · −9 exits

Jeff Smith (CEO) — Activist campaigns in mid-cap companies.

22 posities · top-10 84.3% · +2 nieuw · −4 exits

Nelson Peltz (CEO) — Concentrated operational activism.

9 posities · top-10 100.0%

David Einhorn (President) — Long/short value manager (adviser entity renamed DME Capital Management) — 13F shows reportable longs only.

95 posities · top-10 52.8% · +7 nieuw · −6 exits

Li Lu (Founder) — Very concentrated value book.

8 posities · top-10 100.0% · −6 exits

Prem Watsa (Chairman) — Insurance holding company's equity portfolio.

32 posities · top-10 90.8% · +6 nieuw · −3 exits

Classic Graham-and-Dodd firm — Old-school value manager.

91 posities · top-10 69.2% · +13 nieuw · −15 exits

Mohnish Pabrai (Managing Partner) — Ultra-concentrated value vehicle.

4 posities · top-10 100.0% · +1 nieuw

Bill Ackman (CEO) — Concentrated activist positions in a small number of large companies.

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Michael Burry (Founder) — Small, concentrated book; reported options make headline positions easy to misread.

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Index-fund pioneer — Passive giant — position changes mostly reflect index flows, not views.

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