By Christian Berthelsen 

Hedge fund Astenbeck Capital Management LLC, run by oil trader Andrew Hall, has cut back on its bets and is holding a larger share of its portfolio in cash amid falling oil prices.

The $3.3 billion fund firm, which is known for placing large and long-term wagers on rising oil prices, posted a 0.8% return in August after losing 6.9% in July, according to an investor letter reviewed by The Wall Street Journal. Year to date, Astenbeck has notched gains of 13% compared with average commodity-hedge-fund returns of 3.4%, according to consultancy HFR Inc.

In a Sept. 2 letter to clients, Mr. Hall said the firm didn't hold near-term delivery contracts for U.S. and Brent crude. Astenbeck's biggest wager is a bullish bet on U.S. oil futures for delivery in 2017 and beyond, and the firm also had positions in 2016 and 2017 natural gas, Mr. Hall wrote. The firm has also reduced holdings in platinum-group metals and is wagering on a fall in gold prices, as well as a bullish bet on the U.S. dollar, he added.

Mr. Hall said he remains bullish on oil prices in the long term but noted booming U.S. production has swamped global demand and put a lid on the market, even as geopolitical crises are flaring throughout the oil-rich Middle East and Eastern Europe. Brent crude oil fell below $100 a barrel in intraday trading on Monday for the first time since June 2013. U.S. oil prices have also slid this year. Crude-oil futures prices on the New York Mercantile Exchange were down 5.9% year-to-date through Monday.

"We have significantly reduced our market exposure, booked profits and amassed dry powder," Mr. Hall wrote in the letter. A firm representative had no immediate comment.

Mr. Hall's firm is at a crossroads. Occidental Petroleum Corp., which owns 20% of Astenbeck, has announced it is exiting proprietary oil trading and selling its stake in Astenbeck and Phibro Trading LLC, a sister firm that it owns outright. Mr. Hall is chief executive of both firms, and many executives have dual roles at both. Mr. Hall and other executives at Astenbeck and Phibro had been reaching out to potential buyers or investors over the summer, according to people familiar with the matter.

The letter said the firm has halved the amount of risk it is taking since June, as measured by a metric called Value-at-Risk, and has reduced leverage from nearly two times assets to just over one.

Mr. Hall raised the prospect of deploying more money across markets in the future.

"Although we have reduced our exposure in order to book some profits, we look forward to adding back to our position on any significant pullbacks, " he said in the letter without specifying which assets he was referring to.

Mr. Hall correctly predicted the bull market in oil and other commodities during the 2000s and generated huge profits for Citigroup Inc., then the parent of Phibro. Citi agreed to sell Phibro to Occidental in 2009 after controversy erupted over Mr. Hall's compensation. According to the terms of a contract, Citigroup had guaranteed Mr. Hall $100 million in 2009, but Treasury officials balked at the hefty payday because the bank was a recipient of a taxpayer-funded bailout following the financial crisis.

Write to Christian Berthelsen at christian.berthelsen@wsj.com

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