Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

(Reuters) - Warren Buffett's Berkshire Hathaway Inc on Friday said it boosted its stake in cable TV operator Charter Communications Corp, and signaled it may have another large investment planned after agreeing to buy Precision Castparts Corp in its largest-ever purchase.

Answer: owner_of: Berkshire Hathaway, Charter Communications