Shares of Twitter (NYSE:TWTR) were on the move today, after a handful of the company's C-level executives announced they would not be selling their shares of the company when the lock-up period on employee shares expires on May 5. Goodrich Petroleum (NYSE:GDP) saw shares skyrocket 30% today, after the company announced that it had completed its well in Baton Rouge under budget, and that the well was producing a strong flow rate that was 98% oil. Shares of F5 Networks (NASDAQ:FFIV) saw a boost to shares today, after receiving an upgrade from a Stifel Nicolaus analyst. And Chinese solar cell producer JA Solar (NASDAQ:JASO) is up today, after the company raised its shipment estimates for the first quarter.

In this segment of Monday's Investor Beat, host Alison Southwick and Motley Fool analysts Evan Niu and Taylor Muckerman discuss four stocks making moves on the market today.

OPEC is absolutely terrified of this game-changer
Imagine a company that rents a very specific and valuable piece of machinery for $41,000 per hour. (That's almost as much as the average American makes in a year!) And Warren Buffett is so confident in this company's can't-live-without-it business model, he just loaded up on 8.8 million shares. An exclusive, brand-new Motley Fool report reveals the company we're calling OPEC's Worst Nightmare. Just click here to uncover the name of this industry-leading stock, and join Buffett in his quest for a veritable landslide of profits!

Alison Southwick, Evan Niu, CFA, and Taylor Muckerman have no position in any stocks mentioned. The Motley Fool recommends Twitter and owns shares of F5 Networks. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.