Core Insights - U.S. equity markets reached all-time highs in Q4 2025, with the S&P 500 Index increasing by 2.66% and the Bloomberg U.S. Aggregate Bond Index rising by 1.10% [1] - Value stocks outperformed growth stocks, and the U.S. economy demonstrated resilience, with artificial intelligence being a significant theme as over 300 S&P 500 companies mentioned "AI" in earnings calls [1] - The Composite returned 1.45% pure gross of fees (0.95% net of fees), underperforming the Russell 1000 Value Index's 3.8% gain and the S&P 500 Index's 2.66% gain [1] Company-Specific Insights - Uber Technologies, Inc. was identified as one of the largest detractors in the fourth quarter of 2025, with a one-month return of -9.58% and a market capitalization of $162.517 billion [2] - Despite record trip volumes and significant year-over-year growth in gross bookings, Uber's stock underperformed due to a shift in investor focus towards margin trajectory, regulatory risks, and uncertainties surrounding autonomous vehicles [3] - Management's guidance indicated a deliberate moderation in margin expansion as profits are reinvested into affordability, cross-platform engagement, and early autonomous vehicle initiatives, with regulatory concerns particularly prominent in Europe [3] - Competitive anxiety around autonomous vehicles increased, especially following Lyft's partnership with Waymo and Tesla's ambitions in the robotaxi space, which may pressure near-term margins for Uber [3] - Long-term prospects for Uber remain positive, supported by its global scale, deepening network effects, growing free cash flow, and an expanding cross-platform ecosystem [3]