(Reuters) -Roku ( ROKU ) beat Wall Street estimates for quarterly revenue and forecast second-quarter sales above estimates on Thursday, buoyed by strong ad sales and the ongoing shift to streaming from cable TV .

Shares of the company were flitting between gains and losses in volatile trading after the bell. They were last up about 2%.

Roku ( ROKU ), which sells streaming devices and has its own free, ad-supported channel, has seen more people turn to its platform as major streamers such as Netflix increased prices and economic uncertainty pressured consumer spending. A shift towards subscription-based streaming services from traditional cable packages and the launch of third-party streaming channels, including Peacock, Disney+ and HBO Max, on Roku ( ROKU ) has also fueled user growth.

The company said year-on-year growth of "video advertising across the Roku ( ROKU ) platform outperformed both the overall ad market and the traditional linear TV ad market in the U.S."

Roku ( ROKU ) in April said it had identified a second cyberattack that impacted about 576,000 additional accounts while investigating a breach that affected 15,000 user accounts earlier this year.

The company posted net revenue of about $882 million in the first quarter, compared with analysts' average estimate of $848.6 million, according to LSEG data.

Roku ( ROKU ) forecast second-quarter revenue of $935 million, above analyst estimates of $931.4 million.