Internet microblogging service Twitter said it closed a new round of funding on Friday with five investors, including mutual fund giant T. Rowe Price and private equity firm Insight Venture Partners.

Twitter did not disclose the amount raised in Friday's round, or the valuation of Twitter that it was based on, describing it as a significant round of funding, on the company's official Web blog.

On Thursday, media reports said Twitter was raising $100 million in a round of funding that pegged Twitter's valuation at $1 billion.

It is important to us that we find investment partners who share our vision for building a company of enduring value, wrote Twitter CEO Evan Williams on the blog, noting Twitter closed the round a few hours ago.

San Francisco-based Twitter said the latest funding round included T. Rowe Price and Insight Venture Partners, as well as existing backers Institutional Venture Partners, Spark Capital and Benchmark Capital.

A February round of funding, led by Institutional Venture Partners and Benchmark Capital, had valued Twitter at about $250 million. The pair jointly invested $35 million in Twitter during that round.

A Twitter representative was not immediately available for comment.

(Reporting by Alexei Oreskovic; editing by Andre Grenon)

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