LONDON -- The FTSE 100 (FTSEINDICES:^FTSE) finished on an upbeat note before the bank holiday and has gained a little more today, putting on 0.36% points to reach 6,545 by 8:40 a.m. EDT. A rebound for the big miners is partly behind recent gains.

But which companies are beating the FTSE today? Here are three from the various indexes that are on the rise.

National Express
National Express Group shares have perked up 2.1% to 208 pence this morning after the transport group announced trading "in line with expectations" for the year to date. Among its achievements for 2013 so far the company highlighted two new rail contracts and three coach services in Germany, a new Luton Airport service scheduled for May, and an entry into the California market by National Express Transit.

Chief executive Dean Finch told us the firm's "focus on driving up returns on capital, strong cash generation, organic growth" is proving successful.

Shares in Betfair Group have had a great run since the start of April, and they've gained a further 1.8% today after the firm told us 2013 results should be "above the top end of our guidance range."

As of April 30, revenue is estimated at around 387 million pounds, with EBITDA at 73 million pounds and cash balance at 168 million pounds. The firm also says it has lifted its level of cash savings from 20 million pounds to 30 million pounds, has seen a 108% rise in U.K. customer acquisitions, and now has an 18% higher U.K. customer base year on year.

Iofina (LSE:IOF)
Final results sent Iofina shares up 22.1% to 208 pence, providing shareholders with a near-six-bagger in just a year. The group, which specializes in the production of iodine and natural gas, announced its first year of positive EBITDA and the strongest second half in its history.

With Iofina's iodine extraction plants IO#1 and IO#2 coming online, chairman Chris Fay said, "2012 was a breakthrough year for Iofina not least with the successful start-up of IO#1 with IO#2 following shortly after year end, proving the success of our IOsorb technology."

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Alan Oscroft has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. 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.