diff --git a/src/core/marketplace.cpp b/src/core/marketplace.cpp
index 14243f1..76efc43 100644
--- a/src/core/marketplace.cpp
+++ b/src/core/marketplace.cpp
@@ -41,4 +41,9 @@ int Marketplace::getNumSellersDelete()
     int count = std::count_if(sellers_.begin(), sellers_.end(),
                               [](const auto& a) { return a->getState() == Seller::State::DELETE; });
     return count;
+}
+
+void Marketplace::sortSellers()
+{
+    std::sort(sellers_.begin(), sellers_.end());
 }
\ No newline at end of file
diff --git a/src/core/marketplace.h b/src/core/marketplace.h
index 580e12c..2eb6492 100644
--- a/src/core/marketplace.h
+++ b/src/core/marketplace.h
@@ -16,6 +16,7 @@ class Marketplace
     std::vector<std::unique_ptr<Seller>>& getSellers();
     int getNextSellerNo();
     int getNumSellersDelete();
+    void sortSellers();
 
   private:
     std::vector<std::unique_ptr<Seller>> sellers_;
diff --git a/src/core/seller.cpp b/src/core/seller.cpp
index def265e..3951b93 100644
--- a/src/core/seller.cpp
+++ b/src/core/seller.cpp
@@ -62,4 +62,10 @@ void Seller::cleanupArticles()
     }
 }
 
-// int Seller::numArticlesTotal() const { return static_cast<int>(getArticles().size()); }
\ No newline at end of file
+// int Seller::numArticlesTotal() const { return static_cast<int>(getArticles().size()); }
+
+bool operator<(const Seller& li, const Seller& re) { return li.sellerNo_ < re.sellerNo_; }
+bool operator<(const std::unique_ptr<Seller>& li, const std::unique_ptr<Seller>& re)
+{
+    return li->sellerNo_ < re->sellerNo_;
+}
\ No newline at end of file
diff --git a/src/core/seller.h b/src/core/seller.h
index e334fb2..dd5e7d2 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -32,6 +32,9 @@ class Seller : public Entity
     // int numArticlesTotal() const;
     std::vector<Article*> getArticles(bool onlySold = true) const;
 
+    friend bool operator<(const Seller& li, const Seller& re);
+    friend bool operator<(const std::unique_ptr<Seller>& li, const std::unique_ptr<Seller>& re);
+
   private:
     int sellerNo_{-1};
     int numArticlesOffered_{};
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 0839e78..a0ad153 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -22,6 +22,7 @@ void MainWindow::on_actionEditSeller_triggered()
     auto dialog = std::make_unique<SellerDialog>(this);
     int retCode = dialog->exec();
     if (retCode == QDialog::Accepted) {
+        marketplace_->sortSellers();
         marketplace_->storeToDb();
         statusBar()->showMessage("Änderungen an den Verkäufer-Stammdaten gespeichert.",
                                  STATUSBAR_TIMEOUT);