Check out the companies making headlines in premarket trading. Affirm — The buy-now-pay-later fintech services provider rose 2% after an update to take place at Jefferies on Tuesday. The upgrade was supported by “recent evidence of stabilizing cost of capital and capital market activities, stabilizing (if not improving) credit performance, and continued momentum in adoption rates for BNPL.” Boeing — The maker of 737 Max planes gained about 2% premarket after being upgraded to outperform at RBC Capital Markets. Analyst Ken Herber said the 2024 outlook for Boeing is more favorable as demand in the company’s commercial and defense segments grows more sustainably. Crocs — The maker of iconic, soft shoes rose more than 2.3% on the heels of an upgrade to strong buy at Raymond James on Tuesday. Analyst Rick Patel is more confident about Crocs’ business structure in 2024, and believes the stock’s price-to-earnings ratio is “heavily discounted given our expectation of moderate revenue growth.” Carlyle Group — The private asset manager with nearly $400 billion under management climbed more than 5% premarket after S&P Dow Jones Indices added it to the S&P SmallCap 600 index’s premarket performance Thursday. nLIGHT — Shares of the maker of semiconductor lasers, fiber lasers and optical fibers gained more than 4% after being upgraded to speculative buy at Benchmark. The company highlighted a new Army contract worth $35 million to produce a high-energy laser, which “could result in orders that we estimate could be as many as dozens of laser systems in 24-to-36 months.” Glaukos Corporation — Shares climbed 2.4% after Truist initiated coverage of the medical device stock with a buy rating. Analyst Samuel Brodovsky said Glaukos could see revenue growth expand to 20% or more in 2025 along with improved profit margins. Shopify — Shares of the e-commerce platform fell nearly 3% before the market after Piper Sandler cut it to underweight from neutral. The Wall Street firm said the stock has an “unsustainable valuation” because consensus growth and profit expectations are too aggressive. — CNBC’s Samantha Subin, Yun Li and Jesse Pound contributed reporting