Getco LLC and Knight Capital Group Inc. (KCG) on Monday altered their merger to comply with New York Stock Exchange listings standards, according to a document filed with regulators.

They revised the ratio by which shares of Knight and units of privately held Getco will be exchanged for stock in the combined company.

This will elevate the merged Getco-Knight's share price above the minimum $4.00 per-share required for new companies listed on the Big Board, according to the document.

Getco, a specialist in high-frequency market making, agreed in December to buy Knight, among the largest traders with online brokerages in the U.S., for about $1.4 billion.

The value of the deal was unchanged under the amended merger agreement filed with the Securities and Exchange Commission on Monday.

Under the revised exchange ratio the planned entity's shares are expected to carry a book value of $12.47 each. Terms of the original merger agreement outlined a per-share book value between $3.91 and $3.99 for the combined company.

Shares in Knight settled on Friday at $3.74. Getco and Knight outlined expected cost savings from the deal at between $90 million and $110 million annually though company officials wrote in the filing it could take three years to achieve. Within the first year of the deal closing the firms expect to save $20 million to $30 million, according to the filing. Getco intends to slash costs by streamlining the technology both use to trade shares and derivatives while cutting duplicated positions and operations such as trade processing.

The deal was struck about five months after Knight suffered a $461 million loss as the result of a trading error.

They expect to close the merger by July.

Write to Jacob Bunge at jacob.bunge@dowjones.com

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