Companies General Motors stock continued to slide, after a week of setbacks for the company including a wider-than-expected loss in North America.

Kmart, which reported a wider-than-expected loss for its fiscal third quarter, fell 1/8, to 7 5/8 and was the most active stock on the New York exchange.

WebMD, the online medical services company, gained 8.3 percent even thought it reported a wider-than-expected third-quarter loss after the market closed on Monday.

Novellus, an equipment maker, reported fourth-quarter profits on Tuesday that declined 81 percent and said it would report a wider-than-expected loss for the current quarter.

Dillard's Loss Bigger Than Expected Dillard's reported a wider-than-expected quarterly loss as weak sales prompted discounting.

The company said the revised estimate reflected a slowdown in sales growth at its superstores and wider-than-expected losses at its small bookstores and video game stores.

The Ann Taylor Stores Corporation yesterday posted a wider-than-expected loss for the fiscal second quarter, reflecting weak sales of its spring women's fashions.

Olivetti shares dropped yesterday after the Italian computer and office products company late on Tuesday forecast a wider-than-expected loss for 1995.

Despite yesterday's euphoria, 3Com, which warned of a wider-than-expected quarterly loss after the stock market closed on Monday, plunged as low as $8.97 and ended at $10.03, down $3.34.

Amazon would not say how much that plan would cost, but it warned Wall Street that such extra shipping expenses would contribute to its wider-than-expected losses this quarter.