Berkshire Adds $26.9 Million in Sirius XM Stock

Berkshire Hathaway's Sirius XM stake grew to about 37% of outstanding shares after three days of purchases disclosed to the SEC.

Updated on Nov. 4, 2026 in Public Companies

Berkshire Adds $26.9 Million in Sirius XM Stock

Berkshire Hathaway bought 924,281 Sirius XM shares worth about $26.9 million over three trading days, according to a filing with the U.S. Securities and Exchange Commission on Nov. 3. The holding now totals 125,731,398 shares.

Why it matters

The purchases increase Berkshire's already dominant position in Sirius XM, which the company has held since the September 2024 combination with the Liberty SiriusXM tracking stock. The filing gives public investors a direct look at a major institutional investor adding to its stake as the stock trades near its 52-week high.

Berkshire paid a weighted average of about $28.89 per share on Oct. 30, its largest purchase day, when it bought 743,965 shares. At the Nov. 3 average price the stake is worth about $3.8 billion, while Sirius XM reported third-quarter revenue of $2.153 billion.

The players

Berkshire Hathaway

Berkshire Hathaway is a Omaha-based conglomerate led by Warren Buffett that owns insurance, railroad, utility and consumer businesses and holds large public equity stakes.

Sirius XM

Sirius XM is a U.S. satellite and streaming audio company that operates subscription radio services in cars and online.

U.S. Securities and Exchange Commission

The U.S. Securities and Exchange Commission is the federal agency that enforces securities laws and receives public disclosures of large shareholder transactions.

The details

Berkshire executed the purchases on Oct. 30, Nov. 2 and Nov. 3, buying 66,968 shares at about $29.47 on Nov. 2 and 113,348 shares at about $30.23 on Nov. 3. GEICO holds 109.7 million of the shares and Berkshire subsidiary pension plans hold 16 million.

September 2024: Sirius XM combined with the Liberty SiriusXM tracking stock, making Berkshire its largest investor.
Oct. 27: Sirius XM had 336.5 million shares outstanding.
Oct. 29: Sirius XM reported third-quarter earnings.
Oct. 30: Berkshire bought 743,965 Sirius XM shares.
Nov. 3: Berkshire bought 113,348 more shares and filed the transactions with the SEC.

Market Landscape

Berkshire's accumulation extends the position it built after the September 2024 combination with the Liberty SiriusXM tracking stock, when it became the company's largest investor. The buying now gives Berkshire about 37% of Sirius XM's outstanding shares, a concentration that places the satellite radio company among a small group of heavily held public equities.

For Sirius XM subscribers and shareholders, the filing signals continued heavy institutional ownership by Berkshire, which can influence the stock's trading and governance. The disclosure does not change subscription prices or service availability.

The takeaway

Large shareholder purchases disclosed in SEC filings offer a direct view of institutional conviction, but the filing alone does not reveal the reasoning behind them. Investors tracking Sirius XM can watch future disclosures to see whether Berkshire's buying continues.