| Name | Code | Last | Cur | M. cap. | Industry |
|---|
| Renold PLC | XLON:RNO | 48.80 | GBP | 134 | Industrial Machinery & Equipment |
| Rentokil Initial PLC | XLON:RTO | 377.70 | GBP | 11,582 | Business Support Services |
| Residential Secure Income PLC | XLON:RESI | 54.20 | GBP | 122 | Residential REITs |
| Restore PLC | XLON:RST | 229.00 | GBP | 382 | Business Support Services |
| Revolution Bars Group PLC | XLON:RBG | 0.68 | GBP | 12 | Restaurants |
| Revolution Beauty Group PLC | XLON:REVB | 18.20 | GBP | 70 | Other Retailers |
| RHI Magnesita NV | XLON:RHIM | 3,250.00 | GBP | 1,872 | Construction Materials |
| Ricardo PLC | XLON:RCDO | 411.00 | GBP | 312 | Business Support Services |
| Rightmove PLC | XLON:RMV | 645.40 | GBP | 6,150 | Online Services |
| Rights and Issues Investment Trust PLC | XLON:RIII | 2,280.00 | GBP | 288 | Collective Investments |
| Rio Tinto PLC | XLON:RIO | 4,818.00 | GBP | 100,017 | Other Metals & Minerals |
| RIT Capital Part | XLON:RCP | 1,938.00 | GBP | | |
| River and Mercantile UK Micro Cap Investment Company Ltd | XLON:RMMC | 176.50 | GBP | 73 | Collective Investments |
| Riverfort Global Opportunities PLC | XLON:RGO | 0.22 | GBP | 2 | Diversified Investment Services |
| Riverstone Credit Opportunities Income PLC | XLON:RCOI | 0.74 | GBP | 0 | Collective Investments |
| Riverstone Energy Ltd | XLON:RSE | 790.00 | GBP | 244 | Financial & Commodity Market Operators & Service Providers |
| RM Infrastructure Income PLC | XLON:RMII | 72.00 | GBP | 85 | Collective Investments |
| RM PLC | XLON:RM. | 210.00 | GBP | 138 | Software |
| Robert Walters PLC | XLON:RWA | 324.00 | GBP | 271 | Employment Services |
| Robinson PLC | XLON:RBN | 113.50 | GBP | 23 | Containers & Packaging |
| Rockfire Resources PLC | XLON:ROCK | 0.18 | GBP | 8 | Other Metals & Minerals |
| Rockhopper Exploration PLC | XLON:RKH | 34.40 | GBP | 268 | Oil and Gas Exploration & Production |
| Rockpool Acquisitions PLC | XLON:ROC | 2.85 | GBP | 0 | Shell Companies |
| Rockwood Strategic PLC | XLON:RKW | 264.50 | GBP | 85 | Investment Holding Companies |
| Roebuck Food Group PLC | XLON:RFG | 17.50 | GBP | 6 | Food Retail & Distribution |
| Rolls-Royce Holdings PLC | XLON:RR. | 580.00 | GBP | 60,230 | Aerospace & Defense |
| Roquefort Therapeutics PLC | XLON:ROQ | 3.65 | GBP | 6 | Investment Management & Fund Operators |
| Ross Group PLC | XLON:RGP | 0.68 | GBP | 2 | Courier, Postal, Air Freight & Land-based Logistics |
| Rosslyn Data Technologies PLC | XLON:RDT | 4.75 | GBP | 4 | Software |
| Rostelekom PAO | XLON:RKMD | 1.10 | USD | 2,850 | Integrated Telecommunications Services |
| Rotork PLC | XLON:ROR | 313.60 | GBP | 3,236 | Industrial Machinery & Equipment |
| RS Group PLC | XLON:RS1 | 644.50 | GBP | 3,727 | Electronic Equipment |
| RTC Group PLC | XLON:RTC | 95.00 | GBP | 15 | Employment Services |
| RTW Venture Fund Ltd | XLON:RTWG | 116.00 | USD | 38,966 | Collective Investments |
| Rua Life Sciences PLC | XLON:RUA | 12.00 | GBP | 9 | Medical Equipment |
| Ruffer Investment Company Ltd | XLON:RICA | 264.50 | GBP | 1,074 | Collective Investments |
| RWS Holdings PLC | XLON:RWS | 175.40 | GBP | 789 | Business Support Services |
| S4 Capital PLC | XLON:SFOR | 32.32 | GBP | 240 | Marketing & Advertising |
| Sabien Technology Group PLC | XLON:SNT | 11.50 | GBP | 3 | Industrial Machinery & Equipment |
| Sabre Insurance Group PLC | XLON:SBRE | 133.00 | GBP | 405 | Property & Casualty Insurance |
| Safestay PLC | XLON:SSTY | 24.00 | GBP | 19 | Hotels & Cruise Lines |
| Safestore Holdings PLC | XLON:SAFE | 638.50 | GBP | 1,702 | Self-Storage REITs |
| Saga PLC | XLON:SAGA | 115.80 | GBP | 198 | Multiline Insurance & Brokers |
| Sage Group PLC | XLON:SGE | 1,279.50 | GBP | 15,587 | Software |
| Samuel Heath and Sons PLC | XLON:HSM | 340.00 | GBP | 10 | Construction Supplies & Fixtures |
| Sancus Lending Group Ltd | XLON:LEND | 0.45 | GBP | 3 | Corporate Financial Services |
| Sancus Lending Group Ltd | XLON:LENZ | 108.00 | GBP | 3 | Corporate Financial Services |
| Sanderson Design Group PLC | XLON:SDG | 57.30 | GBP | 50 | Home Furnishings |
| Santander UK PLC | XLON:SANB | 134.50 | GBP | 50,994 | Banks |
| Sareum Holdings PLC | XLON:SAR | 22.50 | GBP | 34 | Biotechnology |