Around a dozen tech companies have gone public so far this year. Post-IPO  life hasn't worked out so well for some of them, but two in particular have rewarded early investors with solid share price gains.

Roku (NASDAQ: ROKU), which makes streaming media devices for TVs, went public back in September, and its shares have risen more than 50% in the weeks since. Shares of Okta (NASDAQ: OKTA), which makes software for businesses to manage cloud and mobile app access, have performed similarly since that company's IPO in April.

Let's take a quick look at what these tech companies do, and why investors have taken a liking to their stocks so far.

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Source: Fool.com