Warren Buffett's Berkshire Hathaway has plowed $150 million into Liberty SiriusXM, and looks set to invest another $180 million

**

· *Warren Buffett's Berkshire Hathaway looks set to invest more than $330 million into Liberty SiriusXM in a matter of weeks.*
· *The billionaire investor's company spent $152 million on the media group's "C" shares between May 21 and June 1, SEC filings show.*
· *Berkshire also received 4.3 million rights to buy more...