Berkshire's latest $27M SIRI purchase lifts stake to 37.4%, but WAIT thesis stands

What happened

Berkshire Hathaway purchased approximately $27 million of Sirius XM shares between Oct. 30 and Nov. 3, lifting its stake to 37.4%, according to a Motley Fool article citing filings. This follows Berkshire's larger buying spree in August 2025 that took its ownership to roughly 37%, reinforcing a 'sticky holder' dynamic even as subscriber trends remain negative. The latest purchase is modest relative to SiriusXM's ~$7 billion market cap and does not alter the company's operating fundamentals: self-pay net adds are still negative, SAC/install remains elevated, and churn is flat at 1.6%. At $20.73, the stock trades below the base-case implied value of $22 but lacks a near-term catalyst to close the gap absent stabilization in subscriber metrics. The WAIT rating remains appropriate, with attractive entry at $18 and trim above $24.

Implication

Investors should not chase the stock solely on Berkshire's vote of confidence. The position is already well-known and unlikely to trigger a re-rating until self-pay net adds approach zero and churn improves without excessive acquisition costs. Maintain a disciplined approach: use weakness toward $18 as an entry point, and consider trimming above $24, as outlined in the base scenario. The next key catalyst is the Feb 5, 2026 earnings release, which will validate FY2025 free cash flow guidance of ~$1.225B and provide initial reads on trial funnel and churn trends.

Thesis delta

No material shift to the investment thesis. Berkshire's modest incremental purchase reinforces existing ownership support but does nothing to change the bearish/fair operating picture (negative net adds, high SAC). The WAIT rating and valuation scenarios remain unchanged.