Arch Capital Group Ltd (ACGL) Q4 2025 Institutional Holdings and Activity Report

I. Holdings Landscape

A deep dive into the concentration data reveals a Herfindahl-Hirschman Index (HHI) of 1039.37, which classifies the stock's ownership as having a low concentration level. In the world of institutional finance, an HHI below 1500 typically signifies a dispersed ownership base where no single entity holds sufficient voting power or market share to unilaterally dictate price action. For investors in ACGL (Arch Capital Group Ltd.) , this low concentration is a double-edged sword. On one hand, it protects the stock from the extreme volatility that often occurs when a "whale" institution exits a position. On the other hand, it suggests that the stock’s performance is driven more by broad market consensus than by the conviction of a few dominant strategic partners.

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II. Institutional Movement Analysis

The most aggressive addition came from Aqr Capital Management, led by quant pioneer Cliff Asness. The firm increased its stake by an impressive 184.07%, adding approximately 1.73 million shares. As a MEGA-scale institution with a portfolio value exceeding $190 billion, AQR’s moves are often driven by factor-based models—value, momentum, and quality. An increase of this magnitude suggests that ACGL (Arch Capital Group Ltd.) likely triggered a "strong buy" signal in AQR’s quantitative models, perhaps due to its robust earnings quality or a favorable valuation relative to its peers in the insurance sector. With a portfolio containing over 3,500 stocks, AQR's decision to nearly triple its exposure to ACGL (Arch Capital Group Ltd.) marks it as a high-conviction tactical bet within their broader systematic strategy.

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III. Capital Flow Interpretation

The large sellers include some of the most influential names in global finance. JPMorgan Chase and UBS Group led the charge, with JPMorgan reducing its stake by 1.45 million shares and UBS by 1.14 million shares. These are "conviction sells" from the institutional core. On the buy side, the largest "large" trade came from Cliff Asness of Aqr Capital Management (+1.73M shares), followed by Wellington Management (+0.96M shares). While the buying from AQR is significant, the sheer volume of "large" sellers (which also include the Vanguard Group and BlackRock) suggests that the institutional "consensus" is currently favoring liquidity over accumulation.

The holding value distribution is "top-heavy," as is common with successful mid-to-large-cap firms. While 14 institutions hold "tiny" positions worth less than $10 million, 7 institutions hold "huge" positions worth over $1 billion. These 7 mega-holders (including Vanguard, BlackRock, and Artisan Partners) control 76.24% of the total institutional value. This concentration of value among a tiny group of elite managers means that any shift in sentiment from just one or two of these "huge" holders—such as the 2%+ reductions we saw from Vanguard and BlackRock this quarter—has a disproportionate impact on the stock’s capital flow dynamics.

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IV. Executive Trading Signals

Director John Pasquesi was the most active seller during this period. On December 16, 2025, he executed three major sales totaling 212,666 shares at prices ranging from $93.81 to $94.17. The total value of these sales exceeded $19.9 million. As a Director, Pasquesi has a deep understanding of the company's long-term strategic positioning. A liquidation of this scale—nearly $20 million in a single day—is a high-conviction signal that he likely viewed the mid-$90s as a full or near-full valuation for the company’s stock.

The President of the company, Rajeh Maamoun, also engaged in significant selling activity. On February 13, 2026, he sold 47,430 shares at a price of $96.12, totaling approximately $4.56 million. It is important to note that a separate record on the same day shows him acquiring shares at a much lower price ($27.12), which likely represents the exercise of stock options. The immediate sale of the resulting shares for $4.56 million suggests a preference for cash liquidity over maintaining a larger equity stake at current market prices. When the President of a company chooses to liquidate a multi-million dollar position, it often suggests that the internal leadership does not see an immediate, massive catalyst on the horizon that would justify holding through the current price level.

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V. Analyst Rating Signals

This creates a $20.00 spread, which represents a 20.6% variance relative to the average target. In analyst modeling, a spread of this size indicates high uncertainty and a significant disagreement over the company's future earnings trajectory. Goldman Sachs’ $88 target implies a significant downside risk from current levels, while RBC’s $108 target suggests a more optimistic growth path. The "Hold" rating from Mizuho at $95 essentially anchors the stock at its current price, suggesting that much of the company's future growth is already priced in.

The divergence between RBC’s $108 target and Goldman’s $88 target is reflected in the institutional divergence between AQR (the aggressive buyer) and the "Big Three" (the cautious sellers). When analysts are this divided, and the consensus sits at "Sell," the stock typically enters a period of high volatility as the market waits for a definitive fundamental catalyst—such as an earnings report—to prove one side right.

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VI. Comprehensive Assessment and Investment Insights

Analyst Consensus vs. Institutional Positioning : The "Sell" consensus from Wall Street analysts, led by Goldman Sachs' $88 price target, provides the fundamental framework for the distribution we see from major holders like JPMorgan and the "Big Three" index managers. The analysts are warning of downside, and the large institutions are acting on those warnings by trimming their exposure. 3. Divergence Analysis : The only notable divergence comes from quantitative MEGA-scale firms like AQR and Adage Capital, which are buying aggressively. This suggests that while the "human" analysts and "insider" executives are bearish, the "algorithmic" side of the market still sees value in ACGL’s financial factors. However, in the current market environment, the weight of the "human" and "anchor" institutional selling is successfully overpowering the quantitative buying.

This section shows only part of the complete report. View the app for the full analysis, position-level detail, and quarter-over-quarter tracking.

Sources and limitations

This report uses public U.S. Securities and Exchange Commission Form 13F disclosures and structured data maintained by 13F Hub. A 13F filing is a quarter-end snapshot of reportable long positions, is normally published with a delay, and does not disclose every short position, cash balance, bond, derivative, or non-U.S. asset.

Narrative content is prepared from the same-period SEC disclosure and 13F Hub structured data, then checked before publication. This material is for research and education, not personalized investment advice.