Stock futures were falling to start the week with tech names leading the way lower ahead of Nvidia's key earnings report.

The artificial-intelligence trade looked set for another wobble as high-flying momentum stocks, such as memory storage company Sandisk, and optical networking companies Lumentum and Coherent, were among the sharpest decliners. Nvidia has a chance to turn things around for tech when it reports earnings after the close of trading Wednesday.

These stocks were among the movers ahead of the open Monday:

Alibaba fell after the Chinese e-commerce giant announced a $10.4 billion share sale to raise funds to bolster its AI spending. The new shares, for investors outside the U.S., were priced at 112.70 Hong Kong dollars, a discount to its Friday closing price of HK$123. The stock fell 8.5% in Hong Kong and its American depositary receipts fell 2%.

Samsung Electronics fell 9% in South Korean trading after unveiling plans to buy back up to $79 billion worth of stock. Investors may have been expecting an even bigger payout from the world's largest memory-chip maker.

The malaise spread to U.S. memory stocks as Micron and Western Digital, alongside chip names including Intel and Marvell Technology.

Steel Dynamics was rising 6% after trade talks between the U.S. and Canada collapsed over the weekend. Rival steel producer Nucor also was up more than 3%. Both fell sharply last week amid reports that a trade deal between the two countries would reduce tariffs on Canadian steel and aluminum imports.