The information in this prospectus is not complete and may be changed. The selling
securityholders may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these
securities in any state where the offer or sale is not permitted.
SUBJECT TO COMPLETION, DATED
SEPTEMBER 28, 2023
PROSPECTUS
18,402,287 Ordinary Shares
3,379,237 Ordinary Shares
7,511,525 American Depositary Shares Representing 15,023,050 Ordinary Shares
This prospectus relates to the resale by the selling securityholders identified in this prospectus, or the selling securityholders, of up to
(i) 3,379,237 ordinary shares and (ii) 7,511,525 American Depositary Shares (ADSs), representing 15,023,050 ordinary shares of Renalytix plc (the Company). 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 or ADSs 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 securities by the selling securityholders. The net
proceeds received from the sale or other disposition of our securities 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 September 27, 2023, the closing sale price of our ADSs was
$1.96 per ADS on Nasdaq. The last reported sale price of our ordinary shares on AIM on September 27, 2023 was £0.78 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 4 of this prospectus under the caption Risk Factors and under the caption Risk Factors in our Annual Report on Form
10-K for the fiscal year ended June 30, 2023, 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 , 2023.