Common Stock

We are offering $     of shares of our common stock pursuant to this prospectus supplement and the accompanying prospectus.

Our common stock is listed on The Nasdaq Global Market under the symbol "RAPP." On October 26, 2026, the last reported sale price of our common stock on The Nasdaq Global Market was $25.33 per share.

Concurrently with this offering, we are offering, pursuant to a separate prospectus supplement,   % convertible senior notes due 2032 (the "convertible notes"), in an aggregate principal amount of $    , plus up to an additional $     aggregate principal amount of convertible notes that the underwriters of the concurrent convertible notes offering have the option to purchase from us (the "concurrent convertible notes offering"). The consummation of this offering is not contingent on the consummation of the concurrent convertible notes offering, and the consummation of the concurrent convertible notes offering is not contingent on the consummation of this offering. This prospectus supplement does not constitute an offer to sell, or the solicitation of an offer to buy, any securities being offered in the concurrent convertible notes offering.

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