Washington: Goldman Sachs Group Inc, JPMorgan Chase & Co. and four other investment banks are conspiring to control the more than $1 trillion (Dh3.67 trillion) market for lending stocks, according to a federal lawsuit.

The complaint by the Iowa Public Employees Retirement System and two other government pension plans claims the banks are blocking a shift to all-electronic system for matching lenders and borrowers of shares, so they can continue to profit from each transaction. In a short sale, traders sell borrowed stock, anticipating the price will drop so they can profit by buying back the shares at a lower price.

“Major investment banks are conspiring to preserve their profits at the expense of everyday investors,” plaintiffs’ attorney Michael Eisenkraft of Washington-based Cohen Milstein Sellers & Toll said in a statement Thursday. The investors are seeking unspecified damages in the class-action antitrust case, which could be tripled under federal law.

The banks are accused of stifling a shift to an electronic “all-to-all” market that would enhance price transparency and competition, while eliminating them as transactional middle men. The market for lending stocks plays a vital role in the US economy, allowing hedging while also ensuring that financial systems operate efficiently.

Client services

Defendants in the suit also include Bank of America Corp, Morgan Stanley, Credit Suisse AG, and UBS AG. Representatives of all the banks declined to comment.

Banks typically locate shares that trading clients are looking to short and then loan them the stock. The business is often done through banks’ prime brokerage units.

While firms don’t disclose fees earned from stock lending, the total prime services units at 12 of the largest global investment banks generated $17.4 billion in revenue last year, according to industry analytics firm Coalition Development Ltd.

JPMorgan loaned or swapped $21.9 billion of equity securities as of June 30, according to a regulatory filing. Goldman Sachs loaned $13.2 billion as of the same date, a filing shows.

The lawsuit suit seeks to represent everyone who entered into a securities lending transaction with those firms since January 2009. The other plainiffs are the Orange County Employees Retirement System and the Sonoma County Employees’ Retirement Association.

“To paraphrase Tolstoy, all efficient markets resemble one another, but each inefficient market is inefficient in its own way,” according to the suit.