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UK Casino Sister Sites Guide 2026 — Every Major Group Mapped
Reviewed by Alex Reed | Published April 2026
Last updated: April 2026
Navigate every major UK casino operator group. Find sister sites, compare brands, and stack welcome bonuses across groups.
Casino sister sites are brands operated by the same parent company. Understanding which casinos belong to which groups helps UK players compare genuine alternatives, stack welcome bonuses across a group, avoid accidentally joining multiple brands with similar terms, and identify which groups share responsible gambling infrastructure.
This hub covers every major UK casino operator group with dedicated guides to the sister sites of each flagship brand.
Why Sister Sites Matter
Choosing a sister site over an unrelated casino has practical implications. Sister brands usually share platform technology, making the deposit and withdrawal experience similar. They share core responsible gambling tools and regulatory compliance. Each individual brand within a group offers its own welcome bonus, meaning you can legitimately claim bonuses at multiple sister brands. GAMSTOP self-exclusion applies across all UKGC-licensed brands in every group.
Sister Sites by Flagship Brand
The Flutter Entertainment UK portfolio including Paddy Power Casino, Betfair Casino, and Sky Casino.
The other angle on the Flutter group, with Paddy Power-focused analysis of the full Flutter UK network.
Midnite operates independently without traditional sister sites, but our guide covers the strongest comparable alternatives in the UK sports-casino hybrid space.
The LeoVegas Group UK brands including LeoVegas itself, 21.co.uk, and BetUK.
The Bally's / Gamesys UK portfolio including Virgin Games, Jackpotjoy, Monopoly Casino, and Heart Bingo.
The full MGM Resorts UK casino portfolio through the LeoVegas Group acquisition.
The 888 Holdings portfolio including William Hill Casino, William Hill Vegas, and Mr Green following the 2022 acquisition.
The William Hill-era brands now operating under 888 Holdings.
The Entain plc UK portfolio including Ladbrokes Casino, Gala Casino, Foxy Casino, and PartyCasino.
The MGM Resorts UK operation through the LeoVegas Group.
The Major UK Casino Operator Groups in 2026
Flutter Entertainment
The largest global gambling operator. UK brands include Sky Vegas, Sky Casino, Paddy Power Casino, Betfair Casino, and PokerStars Casino.
Entain plc
Formerly GVC Holdings. Owns Coral Casino, Ladbrokes Casino, Gala Casino, Foxy Casino, and PartyCasino among others.
888 Holdings
Runs 888 Casino, 888Ladies, 888Bingo, and — since the 2022 acquisition — William Hill Casino, William Hill Vegas, and Mr Green.
LeoVegas Group (MGM Resorts)
Owned by MGM Resorts since 2022. Operates LeoVegas UK, Pub Casino, 21.co.uk, 21 Casino, BetUK, and BetMGM (UK).
Bally's Corporation
Owner of Gamesys since 2022. Operates Bally Casino plus the Gamesys-era portfolio including Virgin Games, Jackpotjoy, Monopoly Casino, and Heart Bingo.
Kindred Group
Runs 32Red and Unibet UK.
Broadway Gaming
Owns All British Casino, Spin Genie, and related brands.
How to Choose Between Sister Sites
When evaluating sister sites within the same group, focus on game catalogue depth for each brand's specific curation, welcome bonus effective value after calculating wagering under the 10x UKGC cap, VIP and loyalty programme structure, brand identity and thematic fit for your preferences, and specific promotional calendars during the period you're evaluating.
Under the January 2026 UKGC rules, wagering terms across UK brands have converged significantly because the 10x cap applies uniformly. This means game catalogue, VIP programmes, and operational quality are now the primary differentiators between sister brands.
Safer Gambling Across Sister Sites
All UKGC-licensed sister brands share mandatory GAMSTOP integration. This means self-exclusion from any UK-licensed casino automatically applies to every UK-licensed brand, not just brands within a specific group. Affordability checks and source of funds verification also apply uniformly. Players should set deposit limits at each individual casino they register at — limits do not automatically carry across sister brands.
Looking Beyond UK-Licensed Groups
For players wanting alternatives outside the UKGC framework, operators like Cosmobet, Velobet, and Kingdom Casino offer Curaçao-licensed options with different bonus structures. These operate under different regulations with different player protections than UK-licensed casinos.
These verified casinos offer competitive bonuses and fast withdrawals.
Weekly casino & slot launch alerts.