diff --git a/apps/openmw/mwgui/companionwindow.cpp b/apps/openmw/mwgui/companionwindow.cpp
index 240198eddc..bdcb8abc9b 100644
--- a/apps/openmw/mwgui/companionwindow.cpp
+++ b/apps/openmw/mwgui/companionwindow.cpp
@@ -43,6 +43,7 @@ namespace MWGui
         , mSortModel(nullptr)
         , mModel(nullptr)
         , mSelectedItem(-1)
+        , mUpdateNextFrame(false)
         , mDragAndDrop(dragAndDrop)
         , mMessageBoxManager(manager)
     {
@@ -134,12 +135,20 @@ namespace MWGui
         mItemView->resetScrollBars();
 
         setTitle(actor.getClass().getName(actor));
+
+        mPtr.getClass().getContainerStore(mPtr).setContListener(this);
     }
 
     void CompanionWindow::onFrame(float dt)
     {
         checkReferenceAvailable();
-        updateEncumbranceBar();
+
+        if (mUpdateNextFrame)
+        {
+            updateEncumbranceBar();
+            mItemView->update();
+            mUpdateNextFrame = false;
+        }
     }
 
     void CompanionWindow::updateEncumbranceBar()
@@ -202,4 +211,13 @@ namespace MWGui
         mSortModel = nullptr;
     }
 
+    void CompanionWindow::itemAdded(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
+
+    void CompanionWindow::itemRemoved(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
 }
diff --git a/apps/openmw/mwgui/companionwindow.hpp b/apps/openmw/mwgui/companionwindow.hpp
index 97f3a0072e..5a4b5880ff 100644
--- a/apps/openmw/mwgui/companionwindow.hpp
+++ b/apps/openmw/mwgui/companionwindow.hpp
@@ -4,6 +4,8 @@
 #include "referenceinterface.hpp"
 #include "windowbase.hpp"
 
+#include "../mwworld/containerstore.hpp"
+
 namespace MWGui
 {
     namespace Widgets
@@ -17,7 +19,7 @@ namespace MWGui
     class SortFilterItemModel;
     class CompanionItemModel;
 
-    class CompanionWindow : public WindowBase, public ReferenceInterface
+    class CompanionWindow : public WindowBase, public ReferenceInterface, public MWWorld::ContainerStoreListener
     {
     public:
         CompanionWindow(DragAndDrop* dragAndDrop, MessageBoxManager* manager);
@@ -30,6 +32,9 @@ namespace MWGui
         void onFrame(float dt) override;
         void clear() override { resetReference(); }
 
+        void itemAdded(const MWWorld::ConstPtr& item, int count) override;
+        void itemRemoved(const MWWorld::ConstPtr& item, int count) override;
+
         std::string_view getWindowIdForLua() const override { return "Companion"; }
 
     private:
@@ -37,6 +42,7 @@ namespace MWGui
         SortFilterItemModel* mSortModel;
         CompanionItemModel* mModel;
         int mSelectedItem;
+        bool mUpdateNextFrame;
 
         DragAndDrop* mDragAndDrop;
 
diff --git a/apps/openmw/mwgui/container.cpp b/apps/openmw/mwgui/container.cpp
index 6ab2c862d4..6e768f6e1e 100644
--- a/apps/openmw/mwgui/container.cpp
+++ b/apps/openmw/mwgui/container.cpp
@@ -38,6 +38,7 @@ namespace MWGui
         , mSortModel(nullptr)
         , mModel(nullptr)
         , mSelectedItem(-1)
+        , mUpdateNextFrame(false)
         , mTreatNextOpenAsLoot(false)
     {
         getWidget(mDisposeCorpseButton, "DisposeCorpseButton");
@@ -160,6 +161,8 @@ namespace MWGui
         MWBase::Environment::get().getWindowManager()->setKeyFocusWidget(mCloseButton);
 
         setTitle(container.getClass().getName(container));
+
+        mPtr.getClass().getContainerStore(mPtr).setContListener(this);
     }
 
     void ContainerWindow::resetReference()
@@ -320,4 +323,25 @@ namespace MWGui
         if (mModel && mModel->usesContainer(ptr))
             MWBase::Environment::get().getWindowManager()->removeGuiMode(GM_Container);
     }
+
+    void ContainerWindow::onFrame(float dt)
+    {
+        checkReferenceAvailable();
+
+        if (mUpdateNextFrame)
+        {
+            mItemView->update();
+            mUpdateNextFrame = false;
+        }
+    }
+
+    void ContainerWindow::itemAdded(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
+
+    void ContainerWindow::itemRemoved(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
 }
diff --git a/apps/openmw/mwgui/container.hpp b/apps/openmw/mwgui/container.hpp
index 555fa8e1ae..a7702ebbfe 100644
--- a/apps/openmw/mwgui/container.hpp
+++ b/apps/openmw/mwgui/container.hpp
@@ -6,6 +6,8 @@
 
 #include "itemmodel.hpp"
 
+#include "../mwworld/containerstore.hpp"
+
 namespace MyGUI
 {
     class Gui;
@@ -21,7 +23,7 @@ namespace MWGui
 
 namespace MWGui
 {
-    class ContainerWindow : public WindowBase, public ReferenceInterface
+    class ContainerWindow : public WindowBase, public ReferenceInterface, public MWWorld::ContainerStoreListener
     {
     public:
         ContainerWindow(DragAndDrop* dragAndDrop);
@@ -30,7 +32,7 @@ namespace MWGui
         void onClose() override;
         void clear() override { resetReference(); }
 
-        void onFrame(float dt) override { checkReferenceAvailable(); }
+        void onFrame(float dt) override;
 
         void resetReference() override;
 
@@ -38,6 +40,9 @@ namespace MWGui
 
         void treatNextOpenAsLoot() { mTreatNextOpenAsLoot = true; }
 
+        void itemAdded(const MWWorld::ConstPtr& item, int count) override;
+        void itemRemoved(const MWWorld::ConstPtr& item, int count) override;
+
         std::string_view getWindowIdForLua() const override { return "Container"; }
 
     private:
@@ -47,6 +52,7 @@ namespace MWGui
         SortFilterItemModel* mSortModel;
         ItemModel* mModel;
         int mSelectedItem;
+        bool mUpdateNextFrame;
         bool mTreatNextOpenAsLoot;
         MyGUI::Button* mDisposeCorpseButton;
         MyGUI::Button* mTakeButton;
diff --git a/apps/openmw/mwgui/draganddrop.cpp b/apps/openmw/mwgui/draganddrop.cpp
index 0fa2cc4e21..52b0939238 100644
--- a/apps/openmw/mwgui/draganddrop.cpp
+++ b/apps/openmw/mwgui/draganddrop.cpp
@@ -11,7 +11,6 @@
 #include "controllers.hpp"
 #include "inventorywindow.hpp"
 #include "itemview.hpp"
-#include "itemwidget.hpp"
 #include "sortfilteritemmodel.hpp"
 
 namespace MWGui
@@ -72,25 +71,25 @@ namespace MWGui
             mSourceSortModel->addDragItem(mItem.mBase, count);
         }
 
-        ItemWidget* baseWidget = MyGUI::Gui::getInstance().createWidget<ItemWidget>(
+        mDraggedWidget = MyGUI::Gui::getInstance().createWidget<ItemWidget>(
             "MW_ItemIcon", 0, 0, 42, 42, MyGUI::Align::Default, "DragAndDrop");
 
         Controllers::ControllerFollowMouse* controller
             = MyGUI::ControllerManager::getInstance()
                   .createItem(Controllers::ControllerFollowMouse::getClassTypeName())
                   ->castType<Controllers::ControllerFollowMouse>();
-        MyGUI::ControllerManager::getInstance().addItem(baseWidget, controller);
+        MyGUI::ControllerManager::getInstance().addItem(mDraggedWidget, controller);
 
-        mDraggedWidget = baseWidget;
-        baseWidget->setItem(mItem.mBase);
-        baseWidget->setNeedMouseFocus(false);
-        baseWidget->setCount(count);
-
-        sourceView->update();
+        mDraggedWidget->setItem(mItem.mBase);
+        mDraggedWidget->setNeedMouseFocus(false);
+        mDraggedWidget->setCount(count);
 
         MWBase::Environment::get().getWindowManager()->setDragDrop(true);
 
         mIsOnDragAndDrop = true;
+
+        // Update item view after completing drag-and-drop setup
+        mSourceView->update();
     }
 
     void DragAndDrop::drop(ItemModel* targetModel, ItemView* targetView)
@@ -124,6 +123,22 @@ namespace MWGui
         mSourceView->update();
     }
 
+    void DragAndDrop::update()
+    {
+        if (mIsOnDragAndDrop)
+        {
+            int count = mItem.mBase.getCellRef().getCount();
+            if (count < mDraggedCount)
+            {
+                mItem.mCount = count;
+                mDraggedCount = count;
+                mDraggedWidget->setCount(mDraggedCount);
+                mSourceSortModel->clearDragItems();
+                mSourceSortModel->addDragItem(mItem.mBase, mDraggedCount);
+            }
+        }
+    }
+
     void DragAndDrop::onFrame()
     {
         if (mIsOnDragAndDrop && mItem.mBase.getCellRef().getCount() == 0)
@@ -137,8 +152,12 @@ namespace MWGui
         // since mSourceView doesn't get updated in drag()
         MWBase::Environment::get().getWindowManager()->getInventoryWindow()->updateItemView();
 
-        MyGUI::Gui::getInstance().destroyWidget(mDraggedWidget);
-        mDraggedWidget = nullptr;
+        if (mDraggedWidget)
+        {
+            MyGUI::Gui::getInstance().destroyWidget(mDraggedWidget);
+            mDraggedWidget = nullptr;
+        }
+
         MWBase::Environment::get().getWindowManager()->setDragDrop(false);
     }
 
diff --git a/apps/openmw/mwgui/draganddrop.hpp b/apps/openmw/mwgui/draganddrop.hpp
index fab7f30d75..94da6cce5f 100644
--- a/apps/openmw/mwgui/draganddrop.hpp
+++ b/apps/openmw/mwgui/draganddrop.hpp
@@ -2,6 +2,7 @@
 #define OPENMW_MWGUI_DRAGANDDROP_H
 
 #include "itemmodel.hpp"
+#include "itemwidget.hpp"
 
 namespace MyGUI
 {
@@ -18,7 +19,7 @@ namespace MWGui
     {
     public:
         bool mIsOnDragAndDrop;
-        MyGUI::Widget* mDraggedWidget;
+        ItemWidget* mDraggedWidget;
         ItemModel* mSourceModel;
         ItemView* mSourceView;
         SortFilterItemModel* mSourceSortModel;
@@ -30,6 +31,7 @@ namespace MWGui
         void startDrag(
             int index, SortFilterItemModel* sortModel, ItemModel* sourceModel, ItemView* sourceView, int count);
         void drop(ItemModel* targetModel, ItemView* targetView);
+        void update();
         void onFrame();
 
         void finish();
diff --git a/apps/openmw/mwgui/inventorywindow.cpp b/apps/openmw/mwgui/inventorywindow.cpp
index a773b4635b..43163e175d 100644
--- a/apps/openmw/mwgui/inventorywindow.cpp
+++ b/apps/openmw/mwgui/inventorywindow.cpp
@@ -86,7 +86,7 @@ namespace MWGui
         , mLastYSize(0)
         , mPreview(std::make_unique<MWRender::InventoryPreview>(parent, resourceSystem, MWMechanics::getPlayer()))
         , mTrading(false)
-        , mUpdateTimer(0.f)
+        , mUpdateNextFrame(false)
     {
         mPreviewTexture
             = std::make_unique<osgMyGUI::OSGTexture>(mPreview->getTexture(), mPreview->getTextureStateSet());
@@ -145,6 +145,8 @@ namespace MWGui
         auto tradeModel = std::make_unique<TradeItemModel>(std::make_unique<InventoryItemModel>(mPtr), MWWorld::Ptr());
         mTradeModel = tradeModel.get();
 
+        mPtr.getClass().getInventoryStore(mPtr).setContListener(this);
+
         if (mSortModel) // reuse existing SortModel when possible to keep previous category/filter settings
             mSortModel->setSourceModel(std::move(tradeModel));
         else
@@ -681,22 +683,21 @@ namespace MWGui
 
     void InventoryWindow::onFrame(float dt)
     {
-        updateEncumbranceBar();
-
-        if (mPinned)
+        if (mUpdateNextFrame)
         {
-            mUpdateTimer += dt;
-            if (0.1f < mUpdateTimer)
+            if (mTrading)
             {
-                mUpdateTimer = 0;
-
-                // Update pinned inventory in-game
-                if (!MWBase::Environment::get().getWindowManager()->isGuiMode())
-                {
-                    mItemView->update();
-                    notifyContentChanged();
-                }
+                mTradeModel->updateBorrowed();
+                MWBase::Environment::get().getWindowManager()->getTradeWindow()->mTradeModel->updateBorrowed();
+                MWBase::Environment::get().getWindowManager()->getTradeWindow()->updateItemView();
+                MWBase::Environment::get().getWindowManager()->getTradeWindow()->updateOffer();
             }
+
+            updateEncumbranceBar();
+            mDragAndDrop->update();
+            mItemView->update();
+            notifyContentChanged();
+            mUpdateNextFrame = false;
         }
     }
 
@@ -848,6 +849,16 @@ namespace MWGui
         mPreview->rebuild();
     }
 
+    void InventoryWindow::itemAdded(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
+
+    void InventoryWindow::itemRemoved(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
+
     MyGUI::IntSize InventoryWindow::getPreviewViewportSize() const
     {
         const MyGUI::IntSize previewWindowSize = mAvatarImage->getSize();
diff --git a/apps/openmw/mwgui/inventorywindow.hpp b/apps/openmw/mwgui/inventorywindow.hpp
index 9fc77ceec5..7f0d64dce0 100644
--- a/apps/openmw/mwgui/inventorywindow.hpp
+++ b/apps/openmw/mwgui/inventorywindow.hpp
@@ -5,6 +5,7 @@
 #include "windowpinnablebase.hpp"
 
 #include "../mwrender/characterpreview.hpp"
+#include "../mwworld/containerstore.hpp"
 #include "../mwworld/ptr.hpp"
 
 namespace osg
@@ -30,7 +31,7 @@ namespace MWGui
     class DragAndDrop;
     class ItemModel;
 
-    class InventoryWindow : public WindowPinnableBase
+    class InventoryWindow : public WindowPinnableBase, public MWWorld::ContainerStoreListener
     {
     public:
         InventoryWindow(DragAndDrop* dragAndDrop, osg::Group* parent, Resource::ResourceSystem* resourceSystem);
@@ -62,6 +63,9 @@ namespace MWGui
 
         void setGuiMode(GuiMode mode);
 
+        void itemAdded(const MWWorld::ConstPtr& item, int count) override;
+        void itemRemoved(const MWWorld::ConstPtr& item, int count) override;
+
         /// Cycle to previous/next weapon
         void cycle(bool next);
 
@@ -107,7 +111,7 @@ namespace MWGui
         std::unique_ptr<MWRender::InventoryPreview> mPreview;
 
         bool mTrading;
-        float mUpdateTimer;
+        bool mUpdateNextFrame;
 
         void toggleMaximized();
 
diff --git a/apps/openmw/mwgui/tradeitemmodel.cpp b/apps/openmw/mwgui/tradeitemmodel.cpp
index 50a55f5061..660e940367 100644
--- a/apps/openmw/mwgui/tradeitemmodel.cpp
+++ b/apps/openmw/mwgui/tradeitemmodel.cpp
@@ -113,6 +113,25 @@ namespace MWGui
         encumbrance = std::max(0.f, encumbrance);
     }
 
+    void TradeItemModel::updateBorrowed()
+    {
+        auto update = [](std::vector<ItemStack>& list) {
+            for (auto it = list.begin(); it != list.end();)
+            {
+                size_t actualCount = it->mBase.getCellRef().getCount();
+                if (actualCount < it->mCount)
+                    it->mCount = actualCount;
+                if (it->mCount == 0)
+                    it = list.erase(it);
+                else
+                    ++it;
+            }
+        };
+
+        update(mBorrowedFromUs);
+        update(mBorrowedToUs);
+    }
+
     void TradeItemModel::abort()
     {
         mBorrowedFromUs.clear();
diff --git a/apps/openmw/mwgui/tradeitemmodel.hpp b/apps/openmw/mwgui/tradeitemmodel.hpp
index d395744d2a..856f33563d 100644
--- a/apps/openmw/mwgui/tradeitemmodel.hpp
+++ b/apps/openmw/mwgui/tradeitemmodel.hpp
@@ -31,6 +31,9 @@ namespace MWGui
 
         void returnItemBorrowedFromUs(ModelIndex itemIndex, ItemModel* source, size_t count);
 
+        /// Update borrowed items in this model
+        void updateBorrowed();
+
         /// Permanently transfers items that were borrowed to us from another model to this model
         void transferItems();
         /// Aborts trade
diff --git a/apps/openmw/mwgui/tradewindow.cpp b/apps/openmw/mwgui/tradewindow.cpp
index ba752303d2..aca7e60fbf 100644
--- a/apps/openmw/mwgui/tradewindow.cpp
+++ b/apps/openmw/mwgui/tradewindow.cpp
@@ -123,6 +123,7 @@ namespace MWGui
         , mItemToSell(-1)
         , mCurrentBalance(0)
         , mCurrentMerchantOffer(0)
+        , mUpdateNextFrame(false)
     {
         getWidget(mFilterAll, "AllButton");
         getWidget(mFilterWeapon, "WeaponButton");
@@ -201,11 +202,27 @@ namespace MWGui
 
         onFilterChanged(mFilterAll);
         mFilterEdit->setCaption({});
+
+        for (const auto& source : itemSources)
+            source.getClass().getContainerStore(source).setContListener(this);
     }
 
     void TradeWindow::onFrame(float dt)
     {
         checkReferenceAvailable();
+
+        if (mUpdateNextFrame)
+        {
+            if (isVisible())
+            {
+                mTradeModel->updateBorrowed();
+                MWBase::Environment::get().getWindowManager()->getInventoryWindow()->getTradeModel()->updateBorrowed();
+                MWBase::Environment::get().getWindowManager()->getInventoryWindow()->updateItemView();
+                mItemView->update();
+                updateOffer();
+            }
+            mUpdateNextFrame = false;
+        }
     }
 
     void TradeWindow::onNameFilterChanged(MyGUI::EditBox* _sender)
@@ -643,4 +660,19 @@ namespace MWGui
         if (mTradeModel && mTradeModel->usesContainer(ptr))
             MWBase::Environment::get().getWindowManager()->removeGuiMode(GM_Barter);
     }
+
+    void TradeWindow::updateItemView()
+    {
+        mItemView->update();
+    }
+
+    void TradeWindow::itemAdded(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
+
+    void TradeWindow::itemRemoved(const MWWorld::ConstPtr& item, int count)
+    {
+        mUpdateNextFrame = true;
+    }
 }
diff --git a/apps/openmw/mwgui/tradewindow.hpp b/apps/openmw/mwgui/tradewindow.hpp
index 33c39cb269..b0581d0d38 100644
--- a/apps/openmw/mwgui/tradewindow.hpp
+++ b/apps/openmw/mwgui/tradewindow.hpp
@@ -4,6 +4,8 @@
 #include "referenceinterface.hpp"
 #include "windowbase.hpp"
 
+#include "../mwworld/containerstore.hpp"
+
 namespace Gui
 {
     class NumericEditBox;
@@ -20,7 +22,7 @@ namespace MWGui
     class SortFilterItemModel;
     class TradeItemModel;
 
-    class TradeWindow : public WindowBase, public ReferenceInterface
+    class TradeWindow : public WindowBase, public ReferenceInterface, public MWWorld::ContainerStoreListener
     {
     public:
         TradeWindow();
@@ -31,23 +33,25 @@ namespace MWGui
         void onFrame(float dt) override;
         void clear() override { resetReference(); }
 
-        void borrowItem(int index, size_t count);
-        void returnItem(int index, size_t count);
-
-        int getMerchantServices();
-
         bool exit() override;
 
         void resetReference() override;
 
         void onDeleteCustomData(const MWWorld::Ptr& ptr) override;
 
+        void updateItemView();
+
+        void itemAdded(const MWWorld::ConstPtr& item, int count) override;
+        void itemRemoved(const MWWorld::ConstPtr& item, int count) override;
+
         typedef MyGUI::delegates::MultiDelegate<> EventHandle_TradeDone;
         EventHandle_TradeDone eventTradeDone;
 
         std::string_view getWindowIdForLua() const override { return "Trade"; }
 
     private:
+        friend class InventoryWindow;
+
         ItemView* mItemView;
         SortFilterItemModel* mSortModel;
         TradeItemModel* mTradeModel;
@@ -81,6 +85,8 @@ namespace MWGui
         int mCurrentBalance;
         int mCurrentMerchantOffer;
 
+        bool mUpdateNextFrame;
+
         void sellToNpc(
             const MWWorld::Ptr& item, int count, bool boughtItem); ///< only used for adjusting the gold balance
         void buyFromNpc(
@@ -91,6 +97,11 @@ namespace MWGui
         void onItemSelected(int index);
         void sellItem(MyGUI::Widget* sender, int count);
 
+        void borrowItem(int index, size_t count);
+        void returnItem(int index, size_t count);
+
+        int getMerchantServices();
+
         void onFilterChanged(MyGUI::Widget* _sender);
         void onNameFilterChanged(MyGUI::EditBox* _sender);
         void onOfferButtonClicked(MyGUI::Widget* _sender);