Transaction - Rapid Micro Biosystems, Inc. $9,800,000 Registered Direct Offering

Lake Street is pleased to announce that it served as joint bookrunner for Rapid Micro Biosystems, Inc. (NASDAQ: RPID) in its sale of approximately 3,581,000 shares of its Class A common stock and accompanying Series A and Series B warrants to purchase an aggregate of 7,162,000 shares of Class A common stock (or pre-funded warrants in lieu thereof), and in lieu of common stock, to certain investors, pre-funded warrants, with an exercise price of $0.01 per share, to purchase an aggregate of up to 1,463,000 shares of its Class A common stock and accompanying Series A and Series B warrants to purchase an aggregate of 2,926,000 shares of Class A common stock (or pre-funded warrants in lieu thereof). The combined offering price per share and accompanying warrants was $1.955, and $1.945 per pre-funded warrant and accompanying warrants. Gross proceeds to Rapid Micro Biosystems, from the offering and concurrent registered direct offering before deducting underwriting discounts and commissions and offering expenses, are expected to be approximately $9.8 million. If all of pre-funded warrants, Series A warrants and Series B warrants sold in this offering are exercised for Class A common stock in cash, the Company expects to receive an additional $21.7 million.

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