CORRECTED - CORRECTED-UPDATE 1-Pre-Paid Legal says receives subpoena from SE

(Removes reference to American Depository Receipt Shares program in paragraph two. The subpoena required the company to produce documents pertaining to its Affirmative Defense Response System program)

* Says SEC investigation is only a fact-finding inquiry

* Says SEC has not reached any conclusions

* Shares tank 21 pct

Oct 6 (Reuters) - Pre-Paid Legal Services Inc PPD.N said it received a subpoena from the Division of Enforcement of the U.S. Securities and Exchange Commission (SEC) as part of a fact-finding inquiry, sending its shares down as much as 21 percent.

The company said the subpoena required it to produce documents pertaining to its treasury stock repurchase program, Affirmative Defense Response System program and membership statistical information, among others.

"We are also responding to comments received by the Division of Corporation Finance of the SEC pertaining to our Form 10-K for fiscal year ended Dec. 31, 2008 and our definitive proxy statement incorporated by reference therein," it said.

The company, which provides legal service benefits plans through a network of independent law firms across the United States and Canada, said it would not able to predict when the inquiries would be resolved.

Shares of the Ada, Oklahoma-based company touched a low of $41.00 before recouping some losses to trade down $8.21 at $43.52 Tuesday on the New York Stock Exchange. They had hit a 52-week high of $52.79 before the news. (Reporting by Renju Jose; Editing by Anne Pallivathuckal)