Biz Stone, co-founder of Twitter, said the firm was not actively seeking more funding after securing what it termed "significant capital" last year from Spark Capital and Bezos Expeditions.
However, he said that Twitter's strong increase has attracted interest "and we decided to accept a unique opportunity to make Twitter even stronger with a very attractive offer".
It has agreed a deal with Benchmark, the investment firm behind brands such as eBay and AOL and Institutional Venture Partners, which has to date invested in companies such as Netflix.
Benchmark partner Peter Fenton will now join the Twitter board.
Twitter allows users to broadcast their thoughts, in 140 characters or fewer, to the wider public on various platforms.
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