diff --git a/src/main/java/edu/ntnu/idi/idatt/model/portfolio/Portfolio.java b/src/main/java/edu/ntnu/idi/idatt/model/portfolio/Portfolio.java
index 5bfba56..4eb2a21 100644
--- a/src/main/java/edu/ntnu/idi/idatt/model/portfolio/Portfolio.java
+++ b/src/main/java/edu/ntnu/idi/idatt/model/portfolio/Portfolio.java
@@ -43,6 +43,11 @@ public boolean removeShare(Share share) {
     return shares.remove(share);
   }
 
+  // TODO: JavaDocs, Junit
+  public void removeShares() {
+    shares.clear();
+  }
+
   /**
    * Getter for ArrayList shares.
    *
diff --git a/src/main/java/edu/ntnu/idi/idatt/storage/SessionManager.java b/src/main/java/edu/ntnu/idi/idatt/storage/SessionManager.java
index 8b40489..94626d1 100644
--- a/src/main/java/edu/ntnu/idi/idatt/storage/SessionManager.java
+++ b/src/main/java/edu/ntnu/idi/idatt/storage/SessionManager.java
@@ -17,7 +17,10 @@
 import com.google.gson.reflect.TypeToken;
 
 import edu.ntnu.idi.idatt.model.Exchange;
+import edu.ntnu.idi.idatt.model.market.Stock;
 import edu.ntnu.idi.idatt.model.player.Player;
+import edu.ntnu.idi.idatt.model.portfolio.Portfolio;
+import edu.ntnu.idi.idatt.model.portfolio.Share;
 import edu.ntnu.idi.idatt.model.transaction.Transaction;
 import edu.ntnu.idi.idatt.service.transaction.TransactionCalculator;
 import edu.ntnu.idi.idatt.session.UserSession;
@@ -104,6 +107,21 @@ public static boolean loadSession(String playerName) {
       if (session.getPlayer().getName().equals(playerName)) {
         UserSession.getInstance().setPlayer(session.getPlayer());
         UserSession.getInstance().setExchange(session.getExchange());
+
+        // Reseed portfolio based on exchange's stock instances.
+        // This has to be done due to Gson loading via reflection.
+        Portfolio portfolio = UserSession.getInstance().getPlayer().getPortfolio();
+        ArrayList<Share> validatedShares = new ArrayList<>();
+
+        for (Share oldShare : portfolio.getShares()) { // Create new instances
+          Stock stock = UserSession.getInstance().getExchange().getStock(oldShare.getStock().getSymbol());
+          Share newShare = new Share(stock, oldShare.getQuantity(), oldShare.getPurchasePrice());
+          validatedShares.add(newShare);
+        }
+
+        portfolio.removeShares(); // Remove all old
+        validatedShares.forEach(share -> portfolio.addShare(share)); // Add new
+
         return true;
       }
     }