Check out the companies making headlines before the bell: Talen Energy — after the Federal Energy Regulatory Commission denied a request to increase the amount of power the Susquehanna nuclear power plant could send to Amazon’s data center campus. The independent power company fell more than 8%. Talen owns a nuclear power plant and sold a data center campus to Amazon earlier this year. In line with this, Constellation Energy and Vistra shares fell about 9% and 3%, respectively. Investors had expected Constellation and Vistra to someday announce similar deals with tech companies. Viking Therapeutics — The drug company soared 7% after announcing promising results for its experimental obesity drug VK2735, including up to 8.2% weight loss within four weeks. The drug is classified as GLP-1, which could put the company in competition with Novo Nordisk and Eli Lilly. Berkshire Hathaway — Shares fell slightly after Warren Buffett’s conglomerate revealed third-quarter operating profits totaled $10.1 billion. That was slightly below analysts’ expectations, according to FactSet. Apple — The iPhone giant comes after Warren Buffett’s Berkshire Hathaway reported earnings Saturday morning, giving up about a quarter of its holdings and showing it has just 300 million shares left. The stock price fell 0.6% due to high trading volume. Berkshire Hathaway shares fell slightly after the company reported third-quarter operating profit of $10.1 billion. This was slightly below the FactSet consensus. Peloton — The exercise equipment company’s stock soared 8% after Bank of America decided to buy from underperformers. The bank said it expected earnings before interest, taxes, depreciation and amortization to increase “significantly” under Peloton’s new CEO Peter Stern, who takes over in January. Ta. Trump Media & Technology Group — Shares of former President Donald Trump’s media company fell more than 3% ahead of Tuesday’s U.S. election. In the days leading up to the election, stock prices have become increasingly volatile. Roblox — Online gaming stock rose 3% after Morgan Stanley upgraded the stock from equal weight to overweight. The investment bank cited Roblox’s growing viewership and said the stock is at a tipping point. Vertex — Shares rose 2.5% as Jefferies upgraded Vertex from hold to buy, saying the tax software company has a runway for long-term growth. The company also raised its price target by $50 from $15, suggesting an upside potential of nearly 20%. Nvidia, Sherwin-Williams — Nvidia and Sherwin-Williams shares are up nearly 2% and 4%, respectively, following the announcement that the companies plan to join the Dow Jones Industrial Average on Nov. 8. It rose more than that. Rival chipmaker Intel will be replaced by Sherwin-Williams, and Dow will be replaced by Sherwin-Williams. Intel shares fell more than 1%, and Dow shares fell 0.6%. —CNBC’s Hakyung Kim, Brian Evans, Sarah Min, Lisa Kailai Han, Spencer Kimball, Tanaya Machel and Michelle Fox Thebald contributed reporting.