JPMorgan Chase has agreed to pay $100 million and make a groundbreaking admission of wrongdoing to settle an investigation into market manipulation involving the bank's multibillion-dollar trading loss in London, a federal regulator announced Wednesday, underscoring how far the bank was willing to go to put the blunder behind it.

The Commodity Futures Trading Commission took aim at JPMorgan for trading activity that was so large and voluminous that it violated new rules under the Dodd-Frank Act, the financial regulatory overhaul passed in response to the financial crisis.

The trading commission charged the bank with recklessly "employing a manipulative device" in the market for swaps, financial contracts that allowed the bank to bet on the health of such companies as American Airlines. The bank sold "a staggering volume of these swaps in a concentrated period," the trading commission said.

Unlike other regulatory actions involving the loss, which focused on porous controls and governance practices at the bank, the pact with the trading commission exposed the bank's actual trading activity. And the case, which brings JPMorgan's tally of fines in the trading loss case to more than $1 billion, was a first for the trading commission. Until now, the commission had never exercised its authority under Dodd-Frank to combat manipulation.

The bank's admission of wrongdoing made the case all the rarer. Banks are typically loath to make such admissions, fearing that an acknowledgment of bad behavior will open the floodgates to litigation from shareholders. But to resolve the investigation, JPMorgan took the unusual step of admitting to facts that the trading commission outlined in its order. In doing so, the bank acknowledged that its traders had acted recklessly.

The concession was the latest, and perhaps most significant, phase of a broader policy shift in Washington, where federal regulators are reversing a practice of allowing banks to "neither admit nor deny" wrongdoing. That practice, in place for decades, rankled consumer advocates and lawmakers, who questioned why Wall Street misdeeds generated only token settlements that banks could easily afford.

JPMorgan's admission to the trading commission — coupled with its acknowledgment to the Securities and Exchange Commission last month that "severe breakdowns" had allowed a group of traders in London to run up more than $6 billion in losses — could provide a template for pursuing other admissions in Wall Street cases.

The trading commission was the sole holdout in settling cases arising from the trading loss, a debacle last year that has come to be known as the London Whale episode. In September, to resolve accusations that the bank had allowed a group of traders to go unchecked as they racked up losses, JPMorgan paid $920 million to four other regulatory agencies — the Securities and Exchange Commission (SEC), the Federal Reserve and the Office of the Comptroller of the Currency in the United States, and the Financial Conduct Authority in Britain. The bank, also blamed for nor alerting its board and regulators to the gravity of the problem, admitted to the SEC that it had violated federal securities laws. The agency, however, continues to investigate whether senior executives at the bank ran afoul of any civil regulations.