Information for ClearSign Combustion Corporation Rights Offering Participants:

ClearSign Combustion Corporation announced a Subscription Rights Offering on December 7, 2016 whereby it distributed to all shareholders of record on December 19, 2016 the right to subscribe for and purchase 0.2 of a unit for each share of the Company’s common stock the holder owned on the record date. Each holder of a subscription right was required to exercise 5 subscription rights to purchase a unit and each unit included one share of common stock (NASDAQ:CLIR) and one warrant (NASDAQ:CLIRW), expiring on January 25, 2019, to purchase an additional share of common stock at an exercise price of $4.00 per share. The Subscription Rights Offering closed on January 25, 2017.  

On January 25, 2017, we filed a Form 8-K wherein we disclosed, under Item 8.01, that the allocated value of the $4.00 unit purchase price was $3.03 per common stock share (CLIR) and $0.97 per warrant (CLIRW). This cost allocation information was promptly provided to our stock transfer agent, VStock Transfer, LLC, and distributed with the securities. We have noticed that a number of brokers have been slow to update the cost information associated with this transaction. To the extent that your broker has not received this information and the above references are insufficient, any broker may inquire of VStock Transfer, LLC either (a) through DTC to be provided this information electronically, or (b) directly to the stock transfer agent at:

VStock Transfer, LLC
18 Lafayette Place
Woodmere, New York 11598
Phone: (212) 828-8436

If you or your broker has further questions, please send your inquiries to investors@clearsign.com and we will promptly respond.

Best regards,

James N. Harmon
Chief Financial Officer
ClearSign Combustion Corporation