Cisco Systems (CSCO) recently made a takeover offer worth more than $20B for Splunk (SPLK) but the companies aren’t currently in active talks, Dana Cimilluca and Cara Lombardo of Wall Street Journal reported Friday night, citing people familiar with the matter. It isn’t clear whether other potential suitors are circling Splunk, the reporters added. Shares of Splunk traded up 11% to $127.45 in after-hours following the Journal’s report while Cisco dropped 22c to $53.68.