Indiana Code Title 28. Financial Institutions § 28-13-7-3

Sec. 3. A voting trust becomes effective on the date the first shares subject to the trust are registered in the trustee's name.  A voting trust may not be made irrevocable for a period of more than ten (10) years after the effective date of the trust unless the voting or consenting rights granted by the trust are coupled with an interest in the shares to which the rights relate.  However, if the agreement so provides, the irrevocable rights may from time to time be extended for additional periods of not more than ten (10) years each as to shares deposited under the agreement whose beneficial owners assent in writing to the extension.  The rights are considered to be coupled with an interest in the shares if reserved or given for any of the following: