Company: RNLXY
Filing Date: 2025-07-30
Form Type: 15-12G
Source: 0001213900-25-069259
Chunk: 0

Company: Renalytix plc
Filing Date: 2025-07-30
Form: 15-12G
Chunk 0
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| UNITED STATES                      |
| SECURITIES AND EXCHANGE COMMISSION 
 Washington, D.C. 20549             |

<div align='center'>FORM 15

CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER

SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION

OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934.

Commission File Number 001-39387</div>

| (Exact name of registrant as specified in its charter) |

| (Address,including zip code, and telephone number, including area code, of registrant’s principal executive offices) |

| (Title                                            
 of each class of securities covered by this Form) |

| (Titles                                                                                                   
 of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains) |

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:

| Rule            
 12g-4(a)(1)     | ☒ |
| Rule            
 12g-4(a)(2)     | ☐ |
| Rule            
 12h-3(b)(1)(i)  | ☒ |
| Rule            
 12h-3(b)(1)(ii) | ☐ |
| Rule            
 15d-6           | ☐ |
| Rule            
 15d-22(b)       | ☐ |

Approximate number of holders of record as of the certification or notice date: 157

Pursuant to the requirements of the Securities Exchange Act of 1934 (Name of registrant as specified in charter) has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

| Date:   July 30, 2025 | By:    | /s/ James McCullough    |
|:----------------------|:-------|:------------------------|
|                       | Name:  | James McCullough        |
|                       | Title: | Chief Executive Officer |