Warren Buffett Has Bought $78 Billion Worth of His Favorite Stock in 7 Years -- but He Currently Prefers Shares of This Legal Monopoly Instead

Warren Buffett has halted Berkshire Hathaway share buybacks for 13 months, citing elevated valuation (60-80% premium to book value) after 24 consecutive quarters of repurchases totaling $78 billion. Simultaneously, despite being a net seller of other equities for 11 quarters, Berkshire Hathaway has significantly increased its stake in Sirius XM Holdings (SIRI) to 37.1% (124.8 million shares). This strategic accumulation reflects Buffett's focus on SIRI's 'legal monopoly' in satellite radio, its resilient subscription-based revenue model providing predictable cash flow, and its historically low forward P/E of 7.6, aligning with his value investing principles.

Analysis

Berkshire Hathaway's recent capital allocation decisions reveal a stark divergence in strategy, underscoring a strict adherence to value investing principles. The company has ceased its share repurchase program for 13 consecutive months, a significant shift following a 24-quarter period where approximately $78 billion was spent on buybacks. This pause directly correlates with Berkshire's stock valuation, which has risen from a 30-50% premium to book value during the buyback period to a 60-80% premium, a level clearly deemed too high by Warren Buffett despite a near-record cash position of $344.1 billion. In sharp contrast to this disciplined capital preservation and a broader net-selling stance across its equity portfolio for 11 quarters, Berkshire has been aggressively accumulating a position in Sirius XM Holdings (SIRI). This accumulation has resulted in a 37.1% ownership stake, positioning SIRI as a high-conviction bet. The investment thesis is built on SIRI's well-defined competitive moat as a legal satellite radio monopoly, its resilient business model where 76.8% of revenue comes from subscriptions rather than cyclical advertising, and its attractive valuation at a forward price-to-earnings ratio of just 7.6.

Key Decisions for Investors

• Investors in Berkshire Hathaway should recognize that the halt in share buybacks, driven by a valuation premium of 60-80% to book value, removes a significant catalyst for near-term price support and signals that management views the stock as fully valued.
• The aggressive and ongoing accumulation of Sirius XM to a 37.1% stake by Berkshire serves as a strong bullish signal, prompting a closer evaluation of SIRI's monopoly characteristics, predictable subscription-based cash flows, and its notably low forward P/E of 7.6 as a potential deep-value opportunity.
• Buffett's broader strategy of accumulating cash while selectively purchasing a single, undervalued monopoly suggests a defensive market outlook; investors might consider mirroring this approach by prioritizing attractively priced companies with strong competitive advantages over broad market index exposure.