Tech Five: IBM flat off mixed earnings results

It's a busy day for quarterly earnings, between Tuesday morning results from Verizon and Yahoo's report after the bell. Let's take a look at the tech stocks to watch:

IBM. Shares of Big Blue are flat in pre-market trading after the company reported mixed results for the first quarter. First quarter earnings were up 9% to $2.91 a share, beating Wall Street forecasts by 10 cents. IBM posted $19.6 billion in revenue, down 12% year-over-year.

Verizon. The telecom giant topped expectations on earnings, but just missed on revenue for the first quarter. Verizon reported earnings of $1.02 per share, beating predictions of 95 cents per share. For the quarter, Verizon added 133,000 new subscribers to FiOS Internet.

Yahoo. The company reports first quarter earnings after the markets close Tueday. Analysts polled by FactSet project revenue of $1.05 billion with earnings of 18 cents a share.

Google. Businesses with a weak mobile presence will suffer on Google search. The company is changing an algorithm that takes affect today that will favor mobile-friendly websites in Google search results.

Twitter. The social network is opening up Direct Messages to allow users to accept private messages from any user. The feature is optional, requiring users to flip the switch in their settings to accept any and all Direct Messages.

Follow Brett Molina on Twitter: @brettmolina23.