Here are some of the stocks the Yahoo Finance team will be watching for you today.

Pfizer (PFE) shares remain in the spotlight. The US drug maker that bought cancer drug firm Medivation (MDVN) just a couple of days ago is now buying part of AstraZeneca’s (AZN) antibiotics business. The deal could be valued at more than $1.5 billion.

FitBit (FIT) shares got a healthy pop ahead of the open after a US trade judge ruled late Tuesday that the maker of wearable fitness trackers did not steal trade secrets from rival Jawbone. However, a final decision on the verdict will happen by the end of the year.

Express (EXPR) shares fell to a 52-week low in early trading. The retailer cut its earnings outlook for the year after delivering a miss on both its top and bottom lines for its fiscal second quarter. Revenue fell nearly 6% from a year ago as sales in existing stores came in much weaker than analysts expected. The company said the results reflected challenging store traffic.

Intuit (INTU) shares fell in early trading. The maker of TurboTax software provided a weak outlook for its current quarter, even though earnings and revenue for its fiscal fourth quarter came in above expectations.

Tesla (TSLA) unveiled improved batteries that will extend the range of its vehicles. Tesla’s Model S Sedan will now go 315 miles on a single charge, up from about 200. The car — with a speed option called “Ludicrous mode” — will go from zero to 60 miles an hour in just 2.5 seconds. Tesla boss Elon Musk claims that makes it the fastest car in the world.