GW Pharmaceuticals Plc jumped after Reuters reported that the company had hired Morgan Stanley as an adviser after being approached by several drugmakers interested in an acquisition.

GW gained 20 percent to $101.47 at 3:31 p.m. in New York trading, its biggest intraday gain since March. Reuters cited people familiar with the matter in its report.

The U.K. company, with a market value of $2.56 billion, develops drugs derived from cannabis. Its leading asset is an experimental treatment for epilepsy, and it’s also working on candidates for cancer, type 2 diabetes and schizophrenia. GW has one approved drug, Sativex, which is used to control involuntary muscle spasms from multiple sclerosis.

Insys Therapeutics Inc., which develops drugs based on synthetic cannabis, rose 5 percent to $15.67.

GW, based in Cambridge, England, isn’t currently interested in a sale, Reuters reported, citing people familiar with the matter. A representative for GW declined to comment.

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