| Altona Rare Earths PLC | REE | GB00BFZNKV91 | |
 Deliveroo PLC | ROO | GB00BNC5T391 | |
 Ecofin U.S. Renewables Infrastructure Trust PLC | RNEP | GB00BLPK4430 | |
| Ecofin U.S. Renewables Infrastructure Trust PLC | RNEW | GB00BLPK4430 | |
 R.E.A. Holdings PLC | RE. | GB0002349065 | |
 R.E.A. Holdings PLC | RE.B | GB0007185639 | |
 Rainbow Rare Earths Limited | RBW | GG00BD59ZW98 | |
 Ramsdens Holdings PLC | RFX | GB00BDR6V192 | |
 Rank Group PLC | RNK | GB00B1L5QH97 | |
 Raspberry PI Holdings PLC | RPI | GB00BS3DYQ52 | |
 Rathbones Group PLC | RAT | GB0002148343 | |
 RC Fornax PLC | RCFX | GB00BTTQ2F04 | |
 RC365 Holding PLC | RCGH | GB00BMG8BL95 | |
| Reabold Resources PLC | RBD | GB00B95L0551 | |
| Reach PLC | RCH | GB0009039941 | |
 React Group PLC | REAT | GB00BPCTRB97 | |
| Real Estate Credit Investments Limited | RECI | GB00B0HW5366 | |
 Real Estate Investors PLC | RLE | GB00B45XLP34 | |
| Record PLC | REC | GB00B28ZPS36 | |
 Red Capital PLC | REDC | JE00BLB56J12 | |
| Red Rock Resources PLC | RRR | GB00BYWKBV38 | |
 Redcentric PLC | RCN | GB00B7TW1V39 | |
| Relx PLC | REL | GB00B2B0DG97 | |
| Renalytix PLC | RNLXY | GB00BYWL4Y04 | |
 Renew Holdings PLC | RNWH | GB0005359004 | |
 Renishaw PLC | RSW | GB0007323586 | |
 Renold PLC | RNO | GB0007325078 | |
 Rentguarantor Holdings PLC | RGG | GB00BSVJ8W91 | |
| Rentokil Initial PLC | RTO | GB00B082RF11 | |
| Residential Secure Income PLC | RESI | GB00BYSX1508 | |
 Resolute Mining Limited | RSG | AU000000RSG6 | |
 Restore PLC | RST | GB00B5NR1S72 | |
 Revolution Beauty Group PLC | REVB | GB00BP7L1T61 | |
| RHI Magnesita N.V. | RHIM | NL0012650360 | |
 Ricardo PLC | RCDO | GB0007370074 | |
 Richmond Hill Resources PLC | RHR | GB00BNTBWF32 | |
 Ricoh Co Ltd | RICO | JP3973400009 | |
 Rightmove PLC | RMV | GB00BGDT3G23 | |
| Rights and Issues Investment Trust PLC | RIII | GB0007392078 | |
 Rio Tinto PLC | RIO | GB0007188757 | |
 RIT Capital Partners PLC | RCP | GB0007366395 | |
 River Global PLC | RVRB | GB00BTDR2S27 | |
| River UK Micro Cap Limited | RMMC | GG00BNDMJP11 | |
 Riverstone Credit Opportunities Income PLC | RCOI | GB00BP0R4J21 | |
 Riverstone Energy Limited | RSE | GG00BSNRFW06 | |
 RM Infrastructure Income PLC | RMII | GB00BYMTBG55 | |
| RM PLC | RM. | GB00BJT0FF39 | |
 Roadside Real Estate PLC | ROAD | GB00BL6TZZ70 | |
| Robert Walters PLC | RWA | GB0008475088 | |
 Robinson PLC | RBN | GB00B00K4418 | |
 Rockfire Resources PLC | ROCK | GB00B42TN250 | |
 Rockhopper Exploration PLC | RKH | GB00B0FVQX23 | |
 Rockpool Acquisitions PLC | ROC | GB00BF2MWC40 | |
 Rolls Royce Holdings PLC | RR. | GB00B63H8491 | |
| Rome Resources PLC | RMR | GB00BYY0JQ23 | |
| Roquefort Therapeutics PLC | ROQ | GB00BMDQ2T15 | |
| Ross Group PLC | RGP | GB0002192606 | |
 Rotork PLC | ROR | GB00BVFNZH21 | |
 RS Group PLC | RS1 | GB0003096442 | |
 RTC Group PLC | RTC | GB0002920121 | |
 RTW Biotech Opportunities Ltd | RTW | GG00BKTRRM22 | |
 RUA Life Sciences PLC | RUA | GB0033360586 | |
 Ruffer Investment Company Limited | RICA | GB00B018CS46 | |
 RWS Holdings PLC | RWS | GB00BVFCZV34 | |
| Technology Minerals PLC | RG1 | GB00BP094P47 | |
