I recommend you speak to an attorney before sending a response. The couple hundred spent upfront might save you a $40K+ judgment later on. In my state if a person uses the bar's attorney referral service, he only pays $25 for an initial consultation. The money goes into some sort of legal fund. Your state may have something similar. You could also check local law schools and see whether they run a legal clinic or a professor there would be willing to speak w/ you.
The suit was filed in a County District Court not a federal one. Unless you live or have a presence in Oklahoma County, I don't think the court there has jurisdiction over you. The petition argues that some stock was sold to OC locals so they do, but individual investors don't know the buyers or sellers of their stock. Once you send a response in, I think you willingly accept the court there has jurisdiction. It could turn into a pain fighting this long distance. Seriously, it's not a good thing to wing something like this.
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"We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful."
-- Warren Buffett
