The Financial Times reports that BlackRock is spending $80 million for a little under 1 percent of the company, valuing the whole at $9 billion.
That's a lower price than investors paid in deals last year that valued Twitter at $11 billion, but those involved smaller blocks of shares. Private-market transactions also tend to be volatile, given the lack of liquidity.
Twitter recently promoted its CFO,
Costolo has also said that Twitter has a "truckload" of money still in the bank. So until a public offering happens, purchases from employees are likely to be the main source of shares for investors who want a stake in the company.