* Nasdaq, NYSE to resume listing enforcement Aug. 3

* Up to 103 companies now failing to meet U.S. rules

* Pain on horizon for companies, and perhaps exchanges

By Jonathan Spicer

NEW YORK, July 15 (Reuters) - Time is running out on as many as 103 public companies now running afoul of rules for staying listed on the major U.S. stock markets.

At the end of this month, temporary reprieves granted by the New York Stock Exchange and the Nasdaq Stock Market will expire, putting renewed pressure on companies that have suffered more than most in the financial crisis and economic slump.

Last fall, the Nasdaq decided to waive its market capitalization and $1 minimum share price requirements to avoid a pending crush of delistings brought on by the severe market drop. The Big Board followed suit in the winter, the first time the centuries-old exchange made such a rule change.

The exchange operators extended those rule suspensions a few times over the last several months, but NYSE Euronext (NYX.N: Quote, Profile, Research)(NYX.PA: Quote, Profile, Research) and Nasdaq OMX (NDAQ.O: Quote, Profile, Research) recently told the U.S. Securities and Exchange Commission they will again start enforcing the listing rules Aug. 3. [ID:nN14300532]

With another extension unlikely, as many as 71 Nasdaq-listed companies and 32 NYSE-listed companies that now fall below the threshholds will face delisting next month, according to the latest data from the exchanges.