Among the companies with shares expected to actively trade in Monday's session are Citigroup Inc. (C) and JA Solar Holdings Co. (JASO).

Acorda Therapeutics Inc. (ACOR) said Monday that its Phase 3 study of its dalfampridine-QD treatment in people with post-stroke walking deficits will start later than originally expected. Shares of the biotechnology company fell 3.4% to $34 in premarket trading.

Chindex International Inc. (CHDX) said it had received a bigger acquisition offer than the one it received from a consortium led by private-equity firm TPG Inc. Chindex--a U.S. company that provides health-care services in China through the United Family Healthcare network--didn't identify the new bidder. Shares rose 17% to $22.90 in recent premarket trading.

Citigroup said its first-quarter profit rose 3.5% from a year earlier as the bank benefited from lower expenses and provisions for soured loans, overshadowing weakness at its fixed-income unit. Shares jumped 4% to $47.50 in premarket trading as results comfortably beat the estimates of analysts polled by Thomson Reuters.

JA Solar raised its first-quarter solar cell and module shipments estimate, a move Chief Executive Baofang Jin attributed to solid execution. The solar-products company's shares rose 5.2% to $9.80 in recent premarket trading.

Trina Solar Ltd. (TSL, K3KD.SG) lowered its solar module shipment guidance for the first quarter, citing a temporary decrease in shipments to the European Union. The Chinese solar panel maker also boosted its gross margin expectations for the quarter. Shares dropped 1.8% to $11.35 premarket.

 
   Watch List: 

Fitch Ratings downgraded its rating on Alcoa Inc. (AA) into junk territory, citing financial strains including weak aluminum prices.

Vornado Realty Trust (VNO) said its board of trustees has approved a plan to spin off the commercial property owner's shopping center business into a new publicly traded real-estate investment trust.

Yahoo Inc. (YHOO) said Tribune Co. (TRBAA) Chief Executive Peter Liguori won't seek re-election to the Internet giant's board of directors. Yahoo didn't provide a reason in a Securities and Exchange Commission filing.

Write to Anna Prior at anna.prior@wsj.com

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