Filed pursuant to Rule 424(b)(5)
Registration No. 333-274733
PROSPECTUS SUPPLEMENT
To Prospectus, dated
October 6, 2023
Up to $15,000,000
American Depositary Shares
Representing Ordinary Shares
We have entered
into an At The Market Offering Agreement, or the Sales Agreement, with H.C. Wainwright & Co., LLC, or Wainwright, relating to the offer and sale of our American Depositary Shares, or ADSs, each representing two ordinary shares, nominal
value £0.0025 per share, from time to time through Wainwright as sales agent or principal. In accordance with the terms of the Sales Agreement, we may, pursuant to this prospectus supplement and the accompanying prospectus, offer and sell ADSs
having an aggregate offering price of up to $15,000,000 from time to time through Wainwright in this offering.
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 May 13, 2024, the closing sale price of our ADSs was
$0.619 per ADS on Nasdaq. The last reported sale price of our ordinary shares on AIM on May 13, 2024 was £0.253 per ordinary share.
Sales of our ADSs, if any, under this prospectus supplement and the accompanying prospectus will be made in sales deemed to be at the
market offerings as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, or the Securities Act, including sales made directly on or through Nasdaq or any other existing trading market in the United States for the
ADSs, sales made to or through a market maker other than on an exchange or otherwise, directly to Wainwright as principal, in negotiated transactions at market prices prevailing at the time of sale or at prices related to such prevailing market
prices and/or in any other method permitted by law. Wainwright is not required to sell any specific number or dollar amount of ADSs, but will act as our sales agent using commercially reasonable efforts consistent with its normal trading and sales
practices to sell on our behalf all of the ADSs requested to be sold by us, subject to the terms and conditions of the Sales Agreement on mutually agreed terms. There is no arrangement for funds to be received in any escrow, trust or similar
arrangement.
Wainwright will be entitled to compensation under the terms of the Sales Agreement at a commission rate of 3.0% of the gross
sales price per ADS sold through Wainwright under the Sales Agreement. See Plan of Distribution beginning on page S-25 for additional information regarding Wainwrights compensation. In
connection with the sale of ADSs on our behalf, Wainwright will be deemed to be an underwriter within the meaning of the Securities Act and the compensation paid to Wainwright will be deemed to be underwriting commissions or discounts.
We have also agreed to provide indemnification and contribution to Wainwright with respect to certain liabilities, including liabilities under the Securities Act or the Exchange Act of 1934, as amended, or the Exchange Act.
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. We have elected to take advantage of the extended transition period allowed for emerging growth companies for complying with new or revised accounting guidance as allowed by
Section 107 of the JOBS Act and Section 7(a)(2)(B) of the Securities Act. See the section entitled Prospectus Supplement SummaryImplications of Being an Emerging Growth Company for additional information.
Investing in our ADSs involves a high degree of risk. Before making an investment decision, please read the information in the section
titled Risk Factors beginning on page S-10 of this prospectus supplement and in the documents incorporated by reference into this prospectus supplement and the
accompanying prospectus.
Neither the U.S. 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 supplement or the accompanying prospectus. Any representation to the contrary is a
criminal offense.
H.C. Wainwright & Co.
The date of this prospectus supplement is May 15, 2024.