By Matt Day

A pair of U.S. copper fabricators Tuesday asked a federal appeals court to reverse the Securities and Exchange Commission's approval of the first U.S. exchange-traded fund that would hold physical copper.

The proposed ETF would bring about "an investor-financed squeeze" in the market for copper available for immediate delivery in the U.S., an attorney for Southwire Co. and Encore Wire Corp. (WIRE) said in a filing with the Court of Appeals for the District of Columbia Circuit.

In the filing, Southwire and Encore asked the court to vacate the SEC's Dec. 14 order approving J.P. Morgan Chase & Co.'s (JPM) JPM XF Physical Copper Trust. In that order, the SEC said it didn't believe that the copper ETF was "likely to disrupt the supply of copper available for immediate delivery," paving the way for the product's listing.

J.P. Morgan, which first filed its request for the fund's shares to list on NYSE Euronext's (NYX) NYSE Arca division in October 2010, declined to comment. The trust would trade like a stock and its shares would represent ownership of the physical copper stored on investors' behalf.

Southwire, of Carrollton, Ga., is the largest U.S.-based wire producer. Encore is a McKinney, Texas-based maker of copper building wire.

-Tatyana Shumsky contributed to this article.

Write to Matt Day at Matt.Day@dowjones.com

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