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NYSE:MRK 1 January 2026 - 12 January 2026

Merck (MRK) stock today: $32 billion Revolution talks and CDC vaccine shift put Feb. 3 in play

Merck (MRK) stock today: $32 billion Revolution talks and CDC vaccine shift put Feb. 3 in play

Merck & Co Inc shares were up about 0.4% at $111.41 on Friday as investors weighed a report that the drugmaker is in talks to buy cancer biotech Revolution Medicines in a deal valued at $28 billion to $32 billion. Revolution shares jumped nearly 16% in extended trading on Thursday after the Financial Times report, which said talks were not final and could still take weeks, with other large drugmakers still circling; Merck and Revolution did not respond to requests for comment. The potential acquisition would be the biggest in the sector since Pfizer’s $43 billion Seagen deal and would add Revolution’s late-stage RAS cancer drug candidate daraxonrasib; Mizuho analysts estimate Revolution’s RAS inhibitors could generate more than $10 billion in risk-adjusted sales by 2035 as Merck looks past Keytruda patent expiries later this decade.
Merck (MRK) stock slips after-hours as CDC backs one-dose HPV shot; Cidara deal closes

Merck (MRK) stock slips after-hours as CDC backs one-dose HPV shot; Cidara deal closes

Merck & Co shares edged down in after-hours trading on Wednesday after U.S. health officials updated the childhood immunization schedule and moved to a single dose for the human papillomavirus vaccine, a change that could pressure demand for Merck’s Gardasil shot. The stock was down about 0.2% at $108.60, after trading between $107.99 and $111.42 in the regular session. HHS.gov
Merck stock slips after Cidara tender offer; $9 billion R&D hit and HPV schedule shift in focus

Merck stock slips after Cidara tender offer; $9 billion R&D hit and HPV schedule shift in focus

Merck & Co shares were down about 0.3% at $108.59 in afternoon trade on Wednesday after the drugmaker said it had completed its cash tender offer for Cidara Therapeutics and expected to finish the acquisition through a merger later in the day. The company said the deal will be treated as an asset acquisition, lifting 2026 research and development expense by about $9.0 billion and cutting earnings per share by roughly 30 cents in the first 12 months. “The acquisition of Cidara strengthens and complements our expanding respiratory portfolio,” Chief Executive Robert M. Davis said. Merck.com
Merck stock starts 2026 higher as Cidara tender-offer deadline hits next week

Merck stock starts 2026 higher as Cidara tender-offer deadline hits next week

Merck & Co. shares ended Friday up about 1.2% at $106.45. Nasdaq said the cash tender offer for Cidara Therapeutics is scheduled to expire one minute after 11:59 p.m. ET on Jan. 6, with the merger tentatively slated to close before the market opens Jan. 7. The exchange said Cidara shares would be halted after the after-hours session on Jan. 6 and suspended Jan. 8 if the deal closes as planned. NASDAQ Trader
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