Updated Feb 18, 2026 · 608 articles
Research
Quarterly deep analysis of institutional holdings, hedge fund strategies, and market trends from SEC 13F filings.
No Q4 Filing: Burry Ended Scion After Concentrating 96.7% Into PLTR+NVDA Puts
Scion filed no Q4 2025 13F by Feb 19, 2026. Burry's final filing concentrated 96.7% into PLTR/NVDA put exposure, then the fund deregistered seven days later—an extreme final act with unusual conviction and timing.
Marcus ChenViking Global's Amazon Boomerang: Halvorsen Sold 3.9M Shares in Q3, Bought Them Back in Q4
Viking Global's Q4 2025 13F reveals a portfolio in violent transition: Amazon re-entered after Q3 exit, Meta dumped for Alphabet, banks slashed 60%, and 21 new positions opened. Inside the $37.7B fund's 56% turnover rate.
Marcus ChenAckman's $1.76B Meta Gambit: Inside Pershing Square's Q4 2025 All-In AI Pivot
Bill Ackman's Pershing Square filed its Q4 2025 13F revealing a brand-new $1.76 billion Meta Platforms position, a 65% Amazon increase, 50% Brookfield accumulation, and a full Chipotle exit — pushing tech exposure to 55% of the $15.5B portfolio.
Marcus ChenRenaissance Slashes NVIDIA 85%, Exits Meta Entirely: Inside the Quant Giant's Most Radical Portfolio Overhaul Since the Quant Quake
Renaissance Technologies' Q4 2025 13F filing reveals the most radical portfolio overhaul in years: an 85% NVIDIA slash, complete Meta exit, 749 positions liquidated, and massive defensive pivots to Costco (+5,221%) and Netflix (+2,545%) — all in the aftermath of October's devastating Quant Quake.
Marcus ChenBridgewater Associates Q4 2025 13F Deep Dive: The $4.8 Billion SPY Bet and Dalio's Portfolio Transformation
Bridgewater Associates 10x'd their S&P 500 ETF position to $4.8 billion — making SPY 22% of the entire portfolio. Inside the Q4 2024 13F: massive sector rotation, 168 position exits, new Tesla and Robinhood bets, and a consumer defensive retreat that reshaped a $21.8 billion fund.
Marcus ChenBerkshire Hathaway Q4 2025 13F Deep Dive: Inside Buffett's $267 Billion Portfolio
A position-by-position analysis of Berkshire Hathaway's Q4 2024 13F filing. Apple selling stops at 300M shares, BAC reduction continues at -14.7%, Constellation Brands enters as the only new buy, and the top 5 holdings dominate at 72% of the $267B portfolio.
Marcus ChenWhale Fund Filings Decoded: What Buffett, Dalio, Griffin, and Simons Revealed in Q4 2025
The February 14 deadline has passed and every major whale fund has filed. Berkshire stopped selling Apple at 300M shares, Bridgewater made a 10x SPY bet, Renaissance doubled down on Robinhood and Spotify, Ackman added Nike, Viking rotated massively into financials, and Burry went all-in on China. Here is what the data reveals.
Marcus ChenWhere Smart Money Converges: The Q4 2025 Institutional Consensus Report
We analyzed 8,541 Q4 2025 13F filings from 8,484 institutional investors to find where smart money converges — and where it diverges. From Microsoft's $264 billion in new institutional capital to the Technology sector's $1.3 trillion dominance, here's what the data reveals about Wall Street's collective positioning heading into 2026.
Marcus Chen