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After-hours buzz: HRTX, SBUX, NSC, FB & more

Traders work at the stock exchange in Frankfurt am Main, central Germany, on September 18, 2015.
Frank Rumpenhorst | AFP | Getty Images
Traders work at the stock exchange in Frankfurt am Main, central Germany, on September 18, 2015.

Take a look at some of Tuesday's after-hours movers:

Heron Therapeutics — Shares of the biotechnology firm spiked 29 percent in after-hours trade on positive results of a clinical study for a drug that manages pain following surgery on the big toe joint.

Norfolk Southern — Mark Manion, executive vice president and chief operating officer, announced he will retire, effective Feb. 1, 2016. Manion will be succeeded by Michael Wheeler, currently vice president of engineering. President and CEO James Squares will replace Charles "Wick" Moorman as chairman of the corporation's board, effective Oct. 1.

Facebook, Twitter — Instagram, which is owned by Facebook, announced its number of users topped 400 million, which is more than Twitter and a 100 million increase from December.

Starbucks — Cappuccine, a producer of frappe and other frozen beverage mixes, sent a cease-and-desist letter to Starbucks for using a trademark in summer flavor names.

BorgWarnerRemy International said that its stockholders approved a previously discussed acquisition of the motor manufacturer by BorgWarner.