Colonnade Acquisition Corp. Information Request Form

You are hereby notified that Levi & Korsinsky, LLP has commenced an investigation into the fairness of the merger of Colonnade Acquisition Corp. (NYSE: CLA) with Ouster, Inc. Upon closing of the business combination, the combined company will operate as Ouster, Inc., and is expected to remain listed on the NYSE under the ticker symbol “OUST”. The public stockholders of Colonnade will own 11% of post-close OUST.

The Colonnade merger investigation concerns whether the Board of Colonnade has harmed stockholders by agreeing to enter into this transaction and whether all material facts have been properly disclosed to stockholders.