LONDON (Reuters) - Nasdaq OMX's (>> NASDAQ OMX Group, Inc.) London-based derivatives market no longer considers itself a startup after a year of trading, having won significant market share, and expects to be able to challenge incumbents on new products, its chief executive said.

NLX, trading for exactly 12 months as of Monday, handles a range of short- and long-term interest rate, euro and sterling-denominated derivative products on a single market.

It competes with Deutsche Boerse's Eurex (>> Deutsche Boerse AG), the dominant player in long-term contracts, and IntercontinentalExchange's Liffe (>> Intercontinentalexchange Group Inc), which is dominant in short-term contracts.

NLX has now traded over 14 million lots and has a 30-day moving-average market share of 16 percent in Euribor, the world's second-largest short-term interest rate contract after Eurodollar.

Its overall market share across all of its products amounts to 5 percent, still less than the 10 percent Nasdaq targeted.

But NLX CEO Charlotte Crosswell told Reuters its share has been enough to answer those who questioned whether it could hold its own, attract investors and gain an audience with buy-side firms.

"We are coming out of our start-up phase. We are seeing some client flow now because we hit 10 percent (in Euribor), and that's bringing more volume," Crosswell said, adding that NLX is currently adding more participants, which will bring the total connected to it to roughly double the 16 it started with.

Crosswell said the impact NLX has had on Liffe or Eurex was not clear, because the static interest rate environment has kept volumes lower than usual. She also acknowledged that NLX was lucky with timing, launching before new rules on derivatives trading kicked in.

The regulations, which are pushing more derivatives trading onto exchanges and through central clearing in the interest of greater clarity and lower risk, have since created new opportunities when it comes to products, Crosswell said.

NLX is considering launching swap futures - standardised contracts that mimic the economic exposure of traditional over-the-counter (OTC) interest rate swaps but are traded on an exchange and require less margin.

It faces stiff competition, however, as a handful of other exchanges are looking at these products. Eurex outlined its own version last week. [ID:nL6N0OD4UQ]

"It's an interesting space. When did you last look at a product that everyone thinks is going to be successful and nobody is the incumbent exchange on it?" Crosswell said.

As mandatory clearing of derivatives comes in under the EU's European Markets Infrastructure Regulation (EMIR), Crosswell believes NLX could further benefit.

Participants on NLX can trade both the short and long ends of the interest rate curve and clear in one location, LCH.Clearnet, which means they may be able to make savings on the margin put up as collateral. Trading on ICE and Eurex means using their respective clearing houses.

"That's really what's driving banks and the buy side – where can they clear? Where can they get margin efficiency? Being able to tap into what I call the incumbent clearer is absolutely key to our potential success," Crosswell said.

LCH.Clearnet is majority-owned by the London Stock Exchange (>> London Stock Exchange Group Plc).

In the short term, the addition of more market makers - several of whom will be matching the prices quoted by incumbents from Monday - could drive more flow, Crosswell said.

The exchange is also set to alter its fees and clearing charges - currently at zero - and revamp its incentives scheme at the end of the month.

(editing by Jane Baird)

By Clare Hutchison