By Christian Berthelsen And Ryan Tracy 

WASHINGTON-- Goldman Sachs Group Inc. executives faced a tough grilling Thursday before a U.S. Senate committee, as lawmakers accused the bank of engaging in a series of aluminum transactions to give itself an unfair advantage.

Sen. Carl Levin (D., Mich.), in a heated back and forth with Goldman officials in charge of the firm's aluminum warehousing business, suggested the firm moved metal between warehouses as part of an effort to drive up prices and increase its own revenue.

"Goldman's ability to influence any portion of the price for a key component of the industrial economy is simply unacceptable," Mr. Levin said. He said the investment bank's actions gave it "the ability to affect prices and supplies of that commodity while trading in financial instruments related to that commodity."

The hearing is part of a two-year, bipartisan probe by the U.S. Senate Permanent Subcommittee on Investigations into how banks like Goldman, J.P. Morgan Chase & Co. and Morgan Stanley built up voluminous inventories of aluminum, copper and other commodities.

A report released ahead of the hearing accused the banks of gaining trading advantages and influencing prices and said the banks often exceeded regulatory limits on the size of commodity holdings. It portrays banks straying far beyond their traditional business lines to dabble in lucrative but risky activities that posed legal and financial threats to the firms.

At the hearing, Goldman officials denied their activities impacted aluminum prices and insisted no confidential information was shared with metals traders. The officials acknowledged that after Goldman bought the warehousing business, Metro International Trade Services LLC, in February 2010, it began engaging in deals with other financial firms that lengthened the wait time for other users to remove aluminum from the warehouse but denied that influenced prices.

"There is no correlation" between length of the wait time and aluminum prices, said Jacques Gabillon, a Goldman executive who is chairman of the board of the aluminum warehouse business. Mr. Levin disputed that argument. He also said Goldman traders could have profited on the activities regardless by playing in futures markets that are a component of the overall aluminum price.

The findings are likely to put additional pressure on the Federal Reserve as it considers whether to restrict or reduce Wall Street banks' role in physical commodity markets. A two-day hearing on the report began Thursday, with Fed Gov. Daniel Tarullo expected to testify on Friday. The Fed, which is reviewing its oversight of banks' commodity-market activities, declined to comment.

The banks identified in the report said they adequately manage risks of the activities and don't use their commodities business to gain an unfair advantage. All three firms have moved to reduce their commodities holdings amid congressional and regulatory scrutiny.

The Senate report also depicts the Fed as failing to stop the bank buildup of commodities, allowing firms like J.P. Morgan to hold assets well in excess of allowable limits. The Fed restricts commodity holdings to 5% of a financial firm's high-quality capital, but the banks used loopholes to hold far more, the report said. At times, the report said, the Fed was simply unaware of how much oil, aluminum and copper banks were stockpiling.

Investigators found J.P. Morgan exceeded restrictions on copper holdings by defining it as a precious metal despite its widespread use in industrial applications and exceeded aluminum limits by holding it as an asset of a subsidiary instead of the parent company. Precious metals are exempt from a federal rule that only 5% of banks' financial trades can end with physically delivering a commodity. Morgan Stanley held 55 million barrels of oil-storage capacity, enough supply for nearly three days' worth of U.S. consumption. Goldman, the report said, engaged in "merry-go-round" transactions involving aluminum for its own financial gain.

The report also cites a previously undisclosed Fed staff review that in 2012 recommended higher capital requirements for big banks engaged in commodities, closer monitoring of those activities and tougher reviews of whether the activities were actually complementary to banks' normal lines of business. The Fed hasn't identified how it has implemented any of the staff's recommendations, the report said. The Fed earlier this year asked for public comments on changes to its commodities policy.

The report didn't offer an overall estimate of profits the banks made as a result of their physical commodities holdings.

Democrat and Republican lawmakers said the report shows additional restrictions are needed to rein in Wall Street's role in raw-materials markets. The report recommended a series of actions that could shrink bank trading and strengthen oversight. While none of the activities highlighted in the report appears to be illegal, officials said they hadn't yet decided whether to refer certain matters to enforcement agencies.

"We found substantial evidence that these activities expose major banks to catastrophic risks that are poorly understood," said Mr. Levin, who chairs the subcommittee and is holding the two-day hearing. Executives from Goldman, J.P. Morgan and Morgan Stanley are set to testify. "They are raising costs and uncertainty for the end users of commodities, which hurts American manufacturers and consumers."

Officials are concerned banks' ownership of volatile commodities poses risks to the firms and the financial system, saying a catastrophic event similar to the Deepwater Horizon explosion or the Exxon-Valdez tanker spill could expose a bank to legal and reputational risk. As liabilities mount, lenders and trading counterparties could withdraw credit and refuse to do business with the bank, posing a risk to the entire financial system given the size and scope of big Wall Street banks.

The Senate report focuses heavily on events that led to a 2010 logjam in wait times to remove aluminum from Detroit metal warehouses operated by Goldman. In September 2010, wait times at the warehouses began to rise to unprecedented levels of as much as two years, which the report said led to a supply shortage that drove up aluminum prices and prompted complaints to lawmakers from major aluminum consumers like MillerCoors LLC.

The report points to agreements between Goldman's warehousing subsidiary and Deutsche Bank AG, London metals hedge fund Red Kite Group and Glencore PLC, a Swiss mining and trading company. Goldman gave the companies incentives to sign contracts to keep their metal inside the warehouse system--increasing warehouse revenue for Goldman and benefiting its trading position, the investigators found. Under the merry-go-round agreements, the metal would merely be transferred between warehouses.

In a report posted on its website Wednesday, Goldman said the activity at its warehouse reflected the desires of its financial-market customers and didn't affect aluminum prices or the availability of aluminum to the broader market. Goldman is pursuing a sale of the warehousing firm, Metro International Trade Services. Representatives of Deutsche Bank and Glencore declined to comment. A portfolio manager at Red Kite couldn't be reached for comment.

The report said Deutsche Bank executed the first such deal in September 2010, asking for delivery of 100,000 tons of aluminum in a single transaction. The amount of metal was the largest withdrawal in the history of the global market for physical metal at the time, and 80 times more than the usual daily flow out of warehouses in the area. The wait time for clients hoping to get their metal ballooned from 20 days to four months.

Senate investigators pointed to weak oversight by the Fed, which they said allowed companies to hold commodity assets well in excess of regulatory limits. J.P. Morgan's physical commodities holdings as of September 2012 were at least $17.4 billion, or about 12% of the high-quality capital it had maintained to absorb losses and avoid needing a taxpayer backstop, according to the report. That was more than twice the 5% regulatory requirement.

J.P. Morgan circumvented the rule "by excluding and minimizing the value of various assets," the report said, adding that the regulations are "riddled with exclusions, poorly coordinated, and currently ineffective to protect taxpayers."

The Fed's legal department hasn't objected to J.P. Morgan's capital calculation, the report said. In a summary of its testimony to be delivered Thursday, J.P. Morgan said it has "robust risk management" in line with Fed rules.

Write to Christian Berthelsen at christian.berthelsen@wsj.com and Ryan Tracy at ryan.tracy@wsj.com

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