All or some of the parties to a voting trust may extend it for additional terms by signing written consent to the extension. An extension is valid for the duration stated in the extension agreement and is valid from the date the first shareholder signs the extension agreement. The voting trustee shall deliver copies of the extension agreement and list of all voting trust beneficial owners to the corporation's principal office. An extension agreement binds only those parties signing it.
SDCL 47-1A-730.1