By Nicole Friedman 

Money is pouring out of a popular investment tied to the oil market, a sign that a monthlong crude-price rally may be running out of gas.

Exchange-traded funds that invest in U.S. oil futures, including the $3.1 billion United States Oil Fund LP, have registered about $2.7 billion of investor outflows this month, according to investment bank Macquarie Group Ltd.

That reverses an inflow that started in January as oil prices tumbled. These ETFs took in roughly $6 billion this year through mid-March, when the U.S. oil benchmark hit a six-year low, according to Macquarie.

Traders and analysts are closely watching weekly production and demand data for signs that the global glut of crude oil that sent prices swooning last year may be shrinking. They are also watching the ETF trends closely, because they say crude prices are vulnerable to a pullback following a 32% run-up since March 17.

ETF buying "created a bottom in March," said Olivier Jakob, managing director of Swiss consulting firm Petromatrix GmbH. If investors "all exit at the same time, then it will also put pressure on the market."

A renewed drop in oil prices could inject fresh uncertainty into global markets. Last year's plunge upended economic forecasts, government budgets and corporate earnings as oil producers struggled to stay afloat and consumers pocketed fuel savings. Crude prices on the New York Mercantile Exchange remain more than 45% below their June 2014 high, settling Friday at $57.15 a barrel, and global markets are watching for signs that the market has bottomed.

Crude-oil ETFs, which can be bought and sold like stocks, invest in crude-oil futures contracts. The U.S. Oil Fund, for example, held 48,037 June crude-oil futures contracts on the New York Mercantile Exchange as of Friday, accounting for 11% of that contract's total open interest.

To many, oil below $50 a barrel earlier in the year offered an enticing opportunity to jump into the market.

The price of oil "will drop to a certain point, but it's not going to go to zero," said Michael Bilyeu, a sports massage therapist in Portland, Ore., who said he bought shares in the VelocityShares 3x Long Crude Oil exchange-traded note in mid-March, when the U.S. oil benchmark was trading near $44 a barrel. The VelocityShares ETN offers gains bigger than the market's when prices rise.

However, as Mr. Bilyeu did further research on the market, he got worried that prices might not keep going up. He sold his position at a profit in mid-April, he said.

"It got a little frothy, and people kind of jumped on board," he said of the market. "I would be shocked if oil doesn't pull back to $50 a barrel."

The structure of the futures market may also be spooking some investors away from ETFs. Many crude-oil ETFs hold futures contracts continuously, meaning that when a futures contract nears expiration, the fund will sell it and buy a later-dated contract. Currently, later-dated crude-oil contracts are more expensive than the front-month contract.

In 2009, after oil's last big selloff, front-month oil futures surged 78%, while the U.S. Oil Fund only gained 19%. Similarly, oil futures have gained 7.3% in the year to date, while the U.S. Oil Fund has fallen 3.4%.

"If I think prices are going to go up 20% in the next two years, given the current shape of the curve, half of that will be eroded" by continuously holding the front-month contract, said Nick Koutsoftas, co-portfolio manager for commodities strategy at Cohen & Steers, who helps oversee $483 million in commodity investments.

This time, oil ETF holders "are trading rather than investing, which is the right thing to do," Mr. Jakob said. "They are a bit quicker to take profits."

John Hyland, chief investment officer of United States Commodity Funds LLC, which manages the U.S. Oil Fund, said flows in and out of the fund don't move oil prices. Many market participants track investment flows in ETFs as well as the futures market to see whether investors are bidding the price higher or lower. But oil prices are more responsive to physical supply-and-demand factors than to ETF trading, Mr. Hyland said.

Since March 17, when U.S. oil prices hit a six-year low of $43.46 a barrel, money managers including hedge funds raised their net bet on rising oil prices by 91%. But most of the shift was due to funds closing out bets on falling prices, rather than adding new wagers that prices would rise, according to data from the Commodity Futures Trading Commission.

If oil futures decline, those speculators who closed out bets on falling prices might start selling again, analysts said.

"We have a 2-million-barrel [a day] surplus," said energy economist Philip Verleger Jr. "It has all the makings for a very serious financial washout."

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