Filed Pursuant to Rule 424(b)(3)
Registration No. 333-265280
PROSPECTUS
11,075,220 Ordinary Shares
1,052,197 American Depositary Shares
Representing 13,179,614 Ordinary Shares
This prospectus relates to the resale by the selling securityholders identified in this prospectus, or the selling securityholders, of
(i) up to 11,075,220 ordinary shares and (ii) 1,052,197 American Depositary Shares, or ADSs, representing 2,104,394 ordinary shares of Renalytix plc, or the Company. Of these shares, 2,221,794 ordinary shares and 103,447 ADSs were purchased in
a private placement that closed in April 2022. The remaining 8,853,426 ordinary shares and 948,750 ADSs are held by Icahn School of Medicine at Mount Sinai and The Mount Sinai Hospital, or collectively, Mount Sinai, and are being registered pursuant
to our obligations under a registration rights agreement with Icahn School of Medicine at Mount Sinai. We are not selling any securities and will not receive any proceeds from the sale of the securities under this prospectus.
The selling securityholders may, from time to time, sell, transfer or otherwise dispose of any or all of the ordinary shares (including in the
form of ADSs) being registered or interests in the ordinary shares being registered on any stock exchange, market or trading facility on which our ordinary shares are traded or in private transactions. These dispositions may be at fixed prices, at
prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices. Prices may vary from purchaser to purchaser during the period of distribution.
See Plan of Distribution. We will not receive any of the proceeds from the sale or other disposition of our ordinary shares by the selling securityholders. The net proceeds received from the sale or other disposition of our ordinary
shares by the selling securityholders, if any, is unknown.
We may amend or supplement this prospectus from time to time by filing
amendments or supplements as required. You should read the entire prospectus, including the additional information described under the heading Incorporation of Documents by Reference, and any amendments or supplements carefully before
you make your investment decision.
Our ADSs are traded on the Nasdaq Global Market, or Nasdaq, under the symbol RNLX. Our
ordinary shares trade on AIM, a market operated by London Stock Exchange plc, under the symbol RENX. On June 3, 2022, the closing sale price of our ADSs was $4.57 per ADS on Nasdaq. The last reported sale price of our ordinary
shares on AIM on June 1, 2022 was £1.55 per ordinary share.
We are an emerging growth company as defined by the
Jumpstart Our Business Startups Act of 2012 and, as such, we have elected to comply with certain reduced public company reporting requirements for this prospectus and future filings. Please see Prospectus Summary-Implications of Being an
Emerging Growth Company.
Investing in our securities involves a high degree of risk. Before deciding whether to invest in our securities, you should consider
carefully the risks that we have described on page 7 of this prospectus under the caption Risk Factors and under the caption Risk Factors in our Annual Report on
Form 20-F for the fiscal year ended June 30, 2021, which is incorporated by reference into this prospectus and which may be amended, supplemented or superseded from time to time by other reports
we file with the SEC in the future. We may also include specific risk factors in supplements to this prospectus under the caption Risk Factors. This prospectus may not be used to sell our securities unless accompanied by a prospectus
supplement.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these
securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.
The date of
this prospectus is June 6, 2022.