Here are the 424B prospectus supplements from Rapid Micro Biosystems, Inc. (RPID) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 424B covers the supplement that carries the terms of a priced offering, so if you follow RPID and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full RPID filings page.
Rapid Micro Biosystems, Inc. is offering 71,607 shares of Class A common stock, each sold together with a Series A warrant (exercise price $1.955) and a Series B warrant (exercise price $2.34), at a combined price of $1.955 per share, subject to consummation of, the Underwritten Offering. The company expects net proceeds of approximately $140,000, with the offering expected to close on or about May 20, 2026. Certain directors and officers have agreed to purchase an aggregate of approximately $140,000 in this offering. The prospectus supplement discloses exercise windows, expiration terms for the Series A and Series B warrants, and pro forma shares outstanding of 44,920,118 Class A shares assuming no warrant exercises, based on March 31, 2026 balances.
Rapid Micro Biosystems is offering 3,581,000 shares of Class A common stock together with accompanying Series A and Series B warrants and pre-funded warrants to certain investors under a prospectus supplement dated May 18, 2026. The offering also includes pre-funded warrants to purchase 1,463,000 shares and accompanying warrants.
The combined public offering price is $1.955 per share (and $1.945 per pre-funded warrant), with the company expecting to receive approximately $8.9 million in net proceeds after underwriting discounts and estimated offering expenses. The prospectus supplement states Series A warrants (exercise price $1.955) are exercisable six months after issuance and expire one year after issuance; Series B warrants (exercise price $2.34) are exercisable six months after issuance and expire five years after issuance.