Latest research, educational guides, and news from the world of institutional investing.
Jane Street Group disclosed $662B across 17,120 positions for Q4 2025 — up 44% in one year. SPY puts alone total $96B. Inside the quant powerhouse.
Citadel Advisors disclosed $665.9B across 15,403 positions for Q4 2025. Every top-15 holding is a put option — from $39.5B in SPY puts to $34.5B in Tesla puts.
Norges Bank disclosed $935B in US equities for Q4 2025. NVIDIA leads at $62B (6.7%), Apple $52B, Microsoft $51B. Zero options, pure equity.
Norges Bank Investment Management, managing the world's largest sovereign wealth fund, disclosed $935B in US equities for Q4 2025 — a 7.4% QoQ increase. NVIDIA leads at $62B (6.7% of portfolio), followed by Apple at $52B and Microsoft at $51B.
A practical 10b5-1 filter that helps investors distinguish routine insider selling from meaningful risk signals.
How to separate true insider conviction from mechanical option-related flows in Form 4 filings.
A practical framework for identifying high-signal insider cluster buying events and filtering out low-information Form 4 noise.
Sanders Capital's $86.8B portfolio exits Alibaba, Halliburton, and Schlumberger while opening a $2.3B Salesforce position and doubling its Lockheed Martin stake — a decisive Q4 2025 value pivot.
Abu Dhabi's Mubadala sovereign wealth fund holds 90% of its $17.5B portfolio in GlobalFoundries, added $631M in Bitcoin via IBIT, and opened positions in 4 quantum computing stocks in Q4 2025.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.