The annual Value Investor Conference is one of the premier events surrounding Berkshire Hathaway's annual meeting in Omaha. The Motley Fool's Michael Olsen and Rex Moore were in attendance and talked to several value investors. 

In today's video, Michael asks Bob Robotti, founder of Robotti & Co., more about Calfrac Well Services, one of his investments in the energy sector.

Rex Moore and Michael Olsen own shares of Berkshire Hathaway. The Motley Fool recommends Halliburton. Try any of our Foolish newsletter services free for 30 days. We Fools may not 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.