diff --git a/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModel.swift b/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModel.swift
new file mode 100644
index 000000000..339b00987
--- /dev/null
+++ b/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModel.swift
@@ -0,0 +1,66 @@
+/*
+ Copyright 2019 New Vector Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import Foundation
+
+@objc final class BubbleReactionsViewModel: NSObject, BubbleReactionsViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let aggregatedReactions: MXAggregatedReactions
+    private let reactionsViewData: [BubbleReactionViewData]
+    private let eventId: String
+    
+    // MARK: Public
+    
+    @objc weak var viewModelDelegate: BubbleReactionsViewModelDelegate?
+    weak var viewDelegate: BubbleReactionsViewModelViewDelegate?
+    
+    // MARK: - Setup
+    
+    @objc init(aggregatedReactions: MXAggregatedReactions,
+               eventId: String) {
+        self.aggregatedReactions = aggregatedReactions
+        self.eventId = eventId
+        
+        self.reactionsViewData = aggregatedReactions.reactions.map { (reactionCount) -> BubbleReactionViewData in
+            return BubbleReactionViewData(emoji: reactionCount.reaction, countString: "\(reactionCount.count)", isCurrentUserReacted: reactionCount.myUserHasReacted)
+        }
+    }
+    
+    // MARK: - Public
+    
+    func process(viewAction: BubbleReactionsViewAction) {
+        switch viewAction {
+        case .loadData:
+            self.viewDelegate?.bubbleReactionsViewModel(self, didUpdateViewState: .loaded(reactionsViewData: self.reactionsViewData))
+        case .tapReaction(let index):
+            guard index < self.aggregatedReactions.reactions.count else {
+                return
+            }
+            let reactionCount = self.aggregatedReactions.reactions[index]
+            if reactionCount.myUserHasReacted {
+                self.viewModelDelegate?.bubbleReactionsViewModel(self, didRemoveReaction: reactionCount, forEventId: self.eventId)
+            } else {
+                self.viewModelDelegate?.bubbleReactionsViewModel(self, didAddReaction: reactionCount, forEventId: self.eventId)
+            }
+        case .addNewReaction:
+            break
+        }
+    }
+}
diff --git a/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModelType.swift b/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModelType.swift
new file mode 100644
index 000000000..04a30726a
--- /dev/null
+++ b/Riot/Modules/Room/BubbleReactions/BubbleReactionsViewModelType.swift
@@ -0,0 +1,43 @@
+/*
+ Copyright 2019 New Vector Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import Foundation
+
+enum BubbleReactionsViewAction {
+    case loadData
+    case tapReaction(index: Int)
+    case addNewReaction
+}
+
+enum BubbleReactionsViewState {
+    case loaded(reactionsViewData: [BubbleReactionViewData])
+}
+
+@objc protocol BubbleReactionsViewModelDelegate: class {
+    func bubbleReactionsViewModel(_ viewModel: BubbleReactionsViewModel, didAddReaction reactionCount: MXReactionCount, forEventId eventId: String)
+    func bubbleReactionsViewModel(_ viewModel: BubbleReactionsViewModel, didRemoveReaction reactionCount: MXReactionCount, forEventId eventId: String)
+}
+
+protocol BubbleReactionsViewModelViewDelegate: class {
+    func bubbleReactionsViewModel(_ viewModel: BubbleReactionsViewModel, didUpdateViewState viewState: BubbleReactionsViewState)
+}
+
+protocol BubbleReactionsViewModelType {
+    var viewModelDelegate: BubbleReactionsViewModelDelegate? { get set }
+    var viewDelegate: BubbleReactionsViewModelViewDelegate? { get set }
+    
+    func process(viewAction: BubbleReactionsViewAction)
+}