Check out the companies making headlines in midday trading. Citigroup – Shares fell more than 2% after a warning from the bank on Wednesday evening about a possible loss in the fourth quarter, due to the decline of the Argentine peso and restructuring fees, compared to what CFO Mark Mason had previously revealed to investors. Citigroup is scheduled to announce fourth-quarter results on Friday morning. Lyft – Lyft shares fell 3% after Goldman Sachs downgraded the ride-sharing company to neutral from buy, citing a more balanced risk-reward. Occidental Petroleum — Shares of the energy producer rose about 1% a day after the company said its strong operating performance helped it weather third-party power outages and its total fourth-quarter production is expected to remain within the guidance range. Separately, Warren Buffett’s Berkshire Hathaway disclosed in a filing that its stake in Occidental had increased to 34%. Salesforce – Shares of the cloud computing company rose 1.3% after Bird upgraded the stock to Outperform from Neutral. “We underestimated the company’s desire to achieve margins, which led to strong performance last year,” analyst Rob Oliver wrote. Cryptocurrency Stocks – Bitcoin miners gave up earlier gains as the cryptocurrency’s price fell in choppy trading, after the Securities and Exchange Commission approved the first U.S. bitcoin ETFs, which hit the market on Thursday. Iris Energy and CleanSpark were both down 10% at midday. Marathon Digital lost 18%, and Riot Platforms shares fell 16%. Cryptocurrency exchange Coinbase fell 7% and MicroStrategy fell almost 6%. Yum Brands – Parent company KFC and Pizza Hut stock fell 1% after Wells Fargo was downgraded to equal weight due to overweight. Yum Brands will likely face a slowdown in traffic and moderation in price gains this year, the bank said. KB Home – Shares fell 2% a day after the homebuilder reported that median home sale prices fell 4.5% in the fourth quarter. Despite this, KB Home’s earnings and revenue for the quarter still exceeded analysts’ expectations. Albemarle – The chemical manufacturer’s stock fell 3% after Deutsche Bank downgraded it to a hold rating. Analyst Corinne Blanchard noted the need to take a more cautious view of the lithium industry in the near to medium term due to price volatility. T. Rowe Price – Shares of the investment management company rose 2.5% after it reported $1.45 trillion in pro forma assets under management as of December 31, 2023. This was higher than its figure of $1.394 trillion on November 30. Discovery – The entertainment companies lost 5.5% and 4.2% respectively following a downgrade from Redburn Atlantic. Analyst Hamilton Faber downgraded Paramount to a sell rating, citing “material downside,” while justifying Warner Bros. Discovery’s downgrade to neutral with a “negative turning point” in the announcement. Seagate Technology – Seagate shares fell 3.5% after BNP Paribas downgraded the data storage company to an underperform rating from neutral. Analyst Karl Ackerman cited the stock’s valuation as a reason for the downgrade. Alliant Energy – The utility stock fell 3% after BMO Capital Markets downgraded it to market perform from outperform. While the company likes the story and long-term fundamentals, it said there are better risk-adjusted opportunities elsewhere. — CNBC’s Michelle Fox, Alexander Haring, Hakyung Kim, Yun Lee, Tanaya Machel and Samantha Sobin contributed reporting.