A special committee investigating allegations of accounting problems at banking software provider Temenos has called the claims misleading and untrue.
Shares in the Geneva-headquartered company rose 19.6% to 73.45 Swiss francs in early trading at 10:57 a.m. CET.
Short-selling firm Hindenburg Research accused the company of secretly funding purchases of its own software and that aggressive accounting practices included rampantly delaying contract renewals.