Updated Feb 28, 2026 · 2187 articles
Insights
Research, news and field guides on institutional positioning. Powered by real SEC filings — 13F, 13D/G, Form 4.
Windacre Doubled Its Portfolio to $9.3B in One Quarter and Made Roper Technologies Its Biggest Bet Ever
Snehal Amin's Windacre Partnership surged from $4.4B to $9.3B in a single quarter, deploying $4.9B across 7 new positions headlined by a brand-new $1.38B bet on Roper Technologies that the fund had never previously held.
Alex RiveraSoros Pivots to Energy and AI Infrastructure - Q4 2025 Portfolio Surges 23%
Soros Fund Management's Q4 2025 13F reveals a bold pivot to energy options (XOP, XLE) and AI infrastructure (CoreWeave, Kodiak AI), with the portfolio surging 23% to $8.6B across 244 assets.
Alex RiveraBridgewater Doubles Its Portfolio to $27.4B After a Record 33% Year - Q4 2025 13F Breakdown
Bridgewater Associates doubled its 13F portfolio to $27.4B in Q4 2025, expanding to 1,040 holdings after Ray Dalio's exit and a record 33% return in its Pure Alpha fund.
Sarah MitchellBuffett Dumps 77% of Amazon in His Final Quarter as CEO - Berkshire Hathaway Q4 2025 13F Deep Dive
Berkshire Hathaway's Q4 2025 13F reveals Buffett slashed Amazon by 77%, continued trimming Apple and Bank of America, while adding to Chevron and Chubb — all in his final quarter as CEO.
Marcus ChenBridgewater Doubles Its Portfolio to $27.4B After a Record 33% Year — Q4 2025 13F Breakdown
Bridgewater Associates doubled its 13F equity portfolio to $27.4B in Q4 2025, adding 549 new holdings. After Ray Dalio's formal exit and a record 33% Pure Alpha return, we break down the fund's systematic, diversified approach.
Sarah MitchellSoros Pivots to Energy & AI Infrastructure — Q4 2025 Portfolio Surges 23% to $8.6 Billion
Soros Fund Management's Q4 2025 13F reveals a bold pivot to energy ETFs (XOP, XLE puts) and AI infrastructure (CoreWeave, Kodiak AI), with AUM surging 23% to $8.6 billion. 115 new positions opened, heavy convertible bond exposure, and a massive energy hedge signal Soros's signature asymmetric macro strategy.
Alex RiveraBuffett Dumps 77% of Amazon in His Final Quarter as CEO — Berkshire Hathaway Q4 2025 13F Deep Dive
Warren Buffett slashed Amazon by 77% in his final quarter as Berkshire Hathaway CEO, while adding to Chevron, Chubb, and Domino's. Deep dive into the $274.2B Q4 2025 13F filing.
Marcus ChenArmitage Sold Every Share of META and Built a $1.36B Amazon Position in Its Place: Inside Egerton’s Q4 2025 Portfolio Reconstruction
John Armitage exited 9 positions including META ($397M) and Progressive, then opened 10 new ones led by a $1.36B Amazon bet at 14.8% of portfolio. More than half of Egerton’s $9.2B portfolio is entirely new.
Sarah MitchellFarallon Slashed $2.5B in Credit Hedges and Built a $6.8B Biotech Empire While Dumping Bitcoin: Inside the Q4 2025 Pivot
Tom Steyer’s Farallon Capital cut its HYG put position by 80% — from $3.17B to $645M — while deploying billions into Revolution Medicines, Natera, and BridgeBio. The $42B fund also dumped 77% of its Bitcoin ETF.
Alex RiveraSoroban Tripled to $14.3B in One Quarter and Built a $2.3B Utility Sleeve Nobody Saw Coming: Inside Mandelblatt's Tech-Utility Barbell
Eric Mandelblatt's Soroban Capital deployed $9.2B in a single quarter — tripling AUM from $5.15B to $14.33B — while building a rare tech-utility barbell with MSFT and AMZN at the top and nine regulated utilities underneath.
Marcus ChenState Street Q4 2025: Low Turnover, Higher AUM, and a Core Beta Rebuild
STATE STREET CORP reported $2980.91B in Q4 2025 13F assets with top-10 concentration at 31.36%. We break down what changed and what retail investors can act on.
Alex RiveraBlackRock Added 81 Net Holdings in Q4 2025 While Keeping a Mega-Cap Core
BlackRock, Inc. reported $5916.35B in Q4 2025 13F assets with top-10 concentration at 30.44%. We break down what changed and what retail investors can act on.
Sarah MitchellVanguard's $6.90T Q4 2025 Filing: Mega-Cap Concentration With Broad-Market Breadth
VANGUARD GROUP INC reported $6897.68B in Q4 2025 13F assets with top-10 concentration at 31.23%. We break down what changed and what retail investors can act on.
Marcus ChenPershing Square's Q4 2025 Pivot: $2.22B in Amazon, $1.76B in Meta, and a 25.2% Portfolio Expansion
Pershing Square expanded its 13F portfolio by 25.2% quarter-over-quarter in Q4 2025, adding Amazon and Meta as major new positions while Brookfield became the top holding.
Alex RiveraCastle Hook Dumped $1.35B in Bitcoin and Built an $8.4B Gold Fortress: Inside the Soros Alumnus's Macro Bet That Doubled Portfolio Size
Josh Donfeld's Castle Hook Partners exited Bitcoin entirely, built a 35% gold allocation, added $8.3B in equity puts, and grew 13F AUM 74% to $24.1B in Q4 2025 — the most dramatic macro pivot of filing season.
Marcus ChenCanadian Oil at #1 in a PepsiCo-and-P&G Portfolio: Inside Yacktman's $7.1B Consumer Brand Fortress
Yacktman's Q4 2025 13F reveals Canadian Natural Resources at #1 (8.9%) in a portfolio famous for PepsiCo, P&G, and Coca-Cola. Inside the $7.1B consumer-value strategy with +146% unrealized gains on oil.
Sarah MitchellPzena Hits $33.4B Record AUM With Auto Parts at #1 and 13.8% of Baxter — Inside the Deep Value Machine's Q4 2025 Filing
Pzena Investment Management hit an all-time high $33.4B AUM in Q4 2025 with Magna International as its #1 holding. The deep value firm owns 13.8% of Baxter International, 11.7% of Skyworks, and 11.3% of Amdocs — with zero FAANG stocks in its top 25.
Alex RiveraSmead Capital's $4.8B Anti-AI Portfolio: 27.5% Housing, Zero Magnificent Seven, and a 15.5x P/E vs the Market's 27.7x
Smead Capital's Q4 2025 13F reveals a $4.8B portfolio with 27.5% in housing, 20.6% in banks, and just 2.2% in tech. At 15.5x P/E vs the S&P 500's 27.7x, Bill Smead is betting that overlooked value sectors will deliver the same alpha they did after similar discounts in 2015, 2020, and 2022.
Marcus ChenQ4 2025 13F: Bank Exposure Signals Institutions Can't Hide
A non-tech research note on interpreting bank exposure changes in Q4 2025 13F filings: rotation patterns, funding sources, and a checklist to avoid common 13F traps.
Marcus Chen