By Laurence Fletcher LONDON (Reuters) - The hedge fund industry's strong rebound from the credit crisis has prompted investors to ask whether some funds have grown too large and inflexible to keep delivering bumper returns for which the sector is famous.
The growth of big funds -- helped by strong returns during the credit crisis and some clients' belief that risks are lower than in start-ups -- helped push industry assets to $1.92 trillion at end-December, close to the all-time high in 2008, according to Hedge Fund Research.
However, with the growth of big funds has come the old question of whether they could be stuck if another crisis hits, whether liquidity forces them into less profitable markets and whether their prized trade ideas will be discovered by rivals.
"By definition a supertanker can't be as nimble as a speedboat," said Ken Kinsey-Quick, fund of hedge fund manager at Thames River, part of F&C <FCAM.L>, who prefers to invest in funds below $1 billion in size.
"They won't be able to respond to market conditions, especially as markets become illiquid. They can't get access to smaller opportunities, for example a new hot IPO coming out of an investment bank -- if everyone wants it then you'll only get a few million dollars (worth)."
Funds betting on bonds and currencies, and CTAS -- which play futures markets -- in particular have grown strongly.
Brevan Howard's Master fund, which is shut to new clients, has grown to $25 billion after gaining around 20 percent in 2008 and 2009, while Man Group's <EMG.L> computer-driven AHL fund is now $23.6 billion, helped by a 33 percent return in 2008.
Meanwhile, Bluecrest's Bluetrend fund, which has temporarily shut to new investors in the past, has nearly tripled in size since the end of 2007 to $8.9 billion after a 43 percent gain in 2008. And Louis Bacon's global macro firm Moore Capital has grown to $15 billion after a good credit crisis.
While capacity varies between strategies, some clients worry about the time it can take a big fund to sell a security in a crisis. Even in today's markets a small fund can sell a position with one phone call while it may take a big fund a morning.
"Because of poorer liquidity you're paying a higher price to get in and out of positions. Given the current political and macroeconomic environment it's important to be able to turn around your portfolio very quickly."
Big funds may find it hard to keep trades secret long enough to implement them, especially when buying or shorting stocks.
One hedge fund executive told Reuters his firm's flagship fund, once several billion dollars in size, used to break up trades between a number of brokers or initially sell a small amount of the stock -- which could give the market the impression it planned to sell more -- before buying heavily.
Meanwhile, Unigestion's Gougenheim said fixing a meeting with managers of big funds can be hard -- if a manager runs most of the money they can be hard to pin down, while if they run a small part it can be hard to find out who runs the rest.
"NOT AN ISSUE"
However, fund executives say markets are liquid enough.
"Size is not an issue whatsoever," Nagi Kawkabani, founding partner at Brevan Howard, told Reuters, adding that the fund's gross exposure -- the sum of bets on rising and falling prices -- was lower than at the start of 2008.
"Markets are much bigger and deeper than they were five or 10 years ago." Brevan would return money to clients if funds became too big, although there are no plans at present, he said.
Thames River's Kinsey-Quick said big CTAs could find it hard to trade smaller markets, although they may take small bets in these markets to show clients they can play them.
An AHL spokesman said size was "a major advantage... It gives us great purchasing power with brokers which translates into tighter spreads whilst paying pay lower commissions."
(Editing by Louise Heavens)