SIOR has leases in the Missippian Lime in Oklahoma, except the company won't release an update or PR if any kind...
a huge longshot is AVOE, who is doing a ridiculous 1/50 R/S and name change unfortunately but they have wells in Smackover, Arkansas which has quietly become a big hotspot with some large names grabbing land...
Also kind of like OTTEF, Aussie company in the Phillipines, they have a lot of claims in the disputed South China Sea which has been getting a lot of attention of late...