Stocks making the biggest moves midday: General Mills, Southwest, Genuine Parts, Norwegian Cruise Line & more

February 17, 2026

TL;DR

General Mills shares tumbled 7% after lowering its 2026 outlook.
Southwest Airlines stock jumped over 6% after receiving an upgrade from UBS to buy.
Warner Bros. Discovery and Paramount shares rose after Netflix granted Warner Bros. Discovery a waiver for deal talks with Paramount Skydance.
Tripadvisor shares rose more than 7% after activist investor Starboard Value, holding a 9% stake, asked the company to consider a sale.
Genuine Parts shares fell over 12% after announcing plans to split its automotive and industrial parts groups into two public companies.
Masimo shares rallied over 34% on reports of nearing an $18 billion acquisition deal with Danaher.
Norwegian Cruise Line Holdings moved over 10% higher after Elliott Investment Management built a more than 10% stake.
ZIM Integrated Shipping Services shares surged 30% as Hapag-Lloyd announced its intent to buy the Israeli competitor for $4.2 billion.
Vulcan Materials slid 5% after posting disappointing fourth-quarter results.
Labcorp fell more than 3% despite exceeding fourth-quarter expectations, with concerns about organic revenue growth.
Leidos shares dropped nearly 3% after reporting fourth-quarter revenue weaker than estimates, though adjusted earnings beat expectations.

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