Startup tech company Twilio sent out letters offering to repurchase stocks, which can be considered a big step that suggests it may finally go public.

According to TechCrunch, Twilio has been silent about going public, but they took a step suggesting they just might. The startup company sent letters offering shareholders to repurchase Series A Preferred Stock and Series B Preferred Stock. The price is $10.179 per share, with a $30 million maximum buyback. The repurchase offer is carried out by SecondMarket and will expire on August 11.

Twilio reached an annual run rate of $100 million in 2014, which effectively attracted developers. Some of the biggest companies that uses Twilio to integrate communications to mobiie and web are Uber Technologies Inc., Airbnb Inc., and even non tech companies like, Coca Cola Enterprises Inc., Hoe Depot Inc., and Wal-Mart Inc. The more communications go through Twilio's app, the more its revenue grows. Now the startup company is adding another $1 million in its annual recurring revenue in a seven-day interval.

Twilio has just joined the ranks of private companies that is worth at least a billion dollars. It has been quetly raising $100 million in funding. This cloud communications company made the Series E round funding back in April. It authorized 8,841,730 worth of new shares in April 24 for $11.31 a share, which gave the company a post valuation of $1.1 billion.

Twilio reportedly has $121.82 million in cash and cash equivalents as of June 30, 2015. It has raised $203.7 million worth of VC funding from investors such as Redpoint, DFJ, Founders Fund, Bessemer, Union Square Ventures, and more.