By Joe Woelfel and Elsa Ohlen

Stock futures fell Tuesday after President Donald Trump said he had fired Lisa Cook from her job as a Federal Reserve governor, stoking concerns about the central bank's independence.

These stocks were poised to make moves Tuesday:

AT&T rose 0.6% after the telecommunications company said it intended to buy spectrum licenses from EchoStar for $23 billion. AT&T said the purchase would give it the exclusive rights to a slice of the radio frequency spectrum in specific areas. AT&T said the transaction would help it to "maintain long-term leadership in advanced connectivity across 5G and fiber." EchoStar shares jumped 60%.

Interactive Brokers was rising 4.2% after S&P Dow Jones Indices announced the online broker would be replacing Walgreens Boots Alliance in the S&P 500 at the open of trading on Thursday. Walgreens is being acquired by the private-equity firm Sycamore Partners in a deal expected to be completed soon.

Talen Energy jumped 4.3% after the power generator was selected to replace Interactive Brokers in the S&P MidCap 400 index, also beginning Thursday.

Advanced Micro Devices gained 2.1% to $166.81 in premarket trading. Analysts at Truist upgraded the stock to Buy from Hold and raised their price target to $213 from $173. The company may be able to eat into Nvidia's share of the lucrative data-center graphics processing unit market, the analysts said.

Eli Lilly's experimental weight-loss pill orforglipron resulted in up to 10.5% weight-loss in overweight or obese patients with Type 2 diabetes in a late-stage trial. Shares of the pharmaceutical company rose 2.4%.

Palantir Technologies dropped 0.6% ahead of the opening bell. Shares of Palantir, which sells AI software to manage and analyze large amounts of data, declined 1% on Monday. CEO Alex Karp unloaded more than 400,000 shares in the data-analytics company last week, according to a filing with the Securities and Exchange Commission.

Nvidia edged up 0.4% in premarket trading after the maker of chips for artificial-intelligence applications closed up 1% onn Tuesday and extended its streak to two trading sessions. It was the best-performing stock in the Dow Jones Industrial Average on Monday. Coming into Tuesday, Nvidia has risen 34% this year. The chip maker is scheduled to report second-quarter earnings on Wednesday.

Serina Therapeutics soared 31% after the microcap clinical-stage drugmaker said the Food and Drug Administration supported the trial for its experimental treatment for Parkinson's disease. The company said it plans to advance its SER-252 drug under the FDA's new drug application regulatory pathway.

Heico, the maker of aerospace aftermarket parts, reported fiscal third-quarter earnings of $1.26 a share, better than analysts' estimates of $1.13. Revenue of $1.15 billion topped forecasts of $1.12 billion. The stock was up 1.5%.

Semiconductor company Semtech posted second-quarter adjusted earnings of 41 cents a share, beating analysts' estimates by 1 cent, as revenue of $258 million rose 20% from a year earlier and topped consensus. Semtech said it expects third-quarter adjusted earnings of 44 cents a share, plus or minus 3 cents, in line with estimates. Shares rose 3%.

Earnings reports are expected Tuesday from MongoDB, Okta, Box, nCino, and PVH.

Write to Joe Woelfel at joseph.woelfel@barrons.com

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August 26, 2025 07:37 ET (11:37 GMT)

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