diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketActions.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketActions.java
index 6282a24..3076b60 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketActions.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketActions.java
@@ -15,6 +15,8 @@ public enum MarketActions {
   SORT_PRICE,
   /** Cycle the change-filter between winners-only and losers-only. */
   SORT_CHANGE,
+  /** Cycle the week-change filter between best-of-week and worst-of-week. */
+  SORT_WEEK_CHANGE,
   /** Show only stocks the player currently owns. */
   SORT_OWNED;
 }
diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketController.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketController.java
index 2c6683f..1ae01e5 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketController.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketController.java
@@ -90,6 +90,13 @@ protected void initInteractions() {
                               ? MarketSort.LOSERS : MarketSort.WINNERS;
               getViewElement().setSort(next);
             });
+    getViewElement().setOnAction(MarketActions.SORT_WEEK_CHANGE,
+            () -> {
+              MarketSort next =
+                      (getViewElement().getCurrentSort() == MarketSort.BEST_WEEK)
+                              ? MarketSort.WORST_WEEK : MarketSort.BEST_WEEK;
+              getViewElement().setSort(next);
+            });
     getViewElement().setOnAction(MarketActions.SORT_OWNED,
             () -> getViewElement().setSort(MarketSort.OWNED));
 
diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketSort.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketSort.java
index 09503ba..5e0df57 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketSort.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketSort.java
@@ -5,8 +5,10 @@
  *
  * <p>{@link #WINNERS} and {@link #LOSERS} are mutually exclusive views
  * of the "change" filter button: pressing the button cycles between
- * the two. {@link #OWNED} acts as a "show only owned" filter rather
- * than a pure sort.</p>
+ * the two. {@link #BEST_WEEK} and {@link #WORST_WEEK} behave the same
+ * way on the "week" filter button, but only consider the change from
+ * the previous week to the current one. {@link #OWNED} acts as a
+ * "show only owned" filter rather than a pure sort.</p>
  * */
 public enum MarketSort {
   /** Alphabetical sort by ticker symbol. */
@@ -17,6 +19,10 @@ public enum MarketSort {
   WINNERS,
   /** Show only stocks with negative change, sorted ascending. */
   LOSERS,
+  /** Show only stocks that went up this week, sorted best to worst. */
+  BEST_WEEK,
+  /** Show only stocks that went down this week, sorted worst to best. */
+  WORST_WEEK,
   /** Show only stocks the player currently owns, sorted by quantity. */
   OWNED;
 }
diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketView.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketView.java
index 09cdf3e..fdd5176 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketView.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/view/widgets/market/MarketView.java
@@ -42,6 +42,7 @@ public class MarketView extends ViewElement<VBox, MarketActions> {
   private Button sortTickerButton;
   private Button sortPriceButton;
   private Button sortChangeButton;
+  private Button sortWeekChangeButton;
   private Button sortOwnedButton;
 
   /** Maps every sort mode to its filter-bar button. Used for active state. */
@@ -113,6 +114,7 @@ private HBox buildFilterBar() {
     sortTickerButton = new Button("A-Z");
     sortPriceButton = new Button("price");
     sortChangeButton = new Button("change");
+    sortWeekChangeButton = new Button("week");
     sortOwnedButton = new Button("owned");
 
     sortButtonMap.put(MarketSort.TICKER, sortTickerButton);
@@ -121,16 +123,20 @@ private HBox buildFilterBar() {
     // between them on each press.
     sortButtonMap.put(MarketSort.WINNERS, sortChangeButton);
     sortButtonMap.put(MarketSort.LOSERS, sortChangeButton);
+    // BEST_WEEK and WORST_WEEK share the week button in the same way.
+    sortButtonMap.put(MarketSort.BEST_WEEK, sortWeekChangeButton);
+    sortButtonMap.put(MarketSort.WORST_WEEK, sortWeekChangeButton);
     sortButtonMap.put(MarketSort.OWNED, sortOwnedButton);
 
     registerButton(MarketActions.SORT_TICKER, sortTickerButton);
     registerButton(MarketActions.SORT_PRICE, sortPriceButton);
     registerButton(MarketActions.SORT_CHANGE, sortChangeButton);
+    registerButton(MarketActions.SORT_WEEK_CHANGE, sortWeekChangeButton);
     registerButton(MarketActions.SORT_OWNED, sortOwnedButton);
 
     HBox filterBar = new HBox(8,
             searchField, sortTickerButton, sortPriceButton,
-            sortChangeButton, sortOwnedButton);
+            sortChangeButton, sortWeekChangeButton, sortOwnedButton);
     filterBar.setAlignment(Pos.CENTER_LEFT);
     filterBar.setPadding(Insets.EMPTY);
 
@@ -163,7 +169,8 @@ protected void initStyling() {
     getRootPane().getStyleClass().add("market-container");
 
     searchField.getStyleClass().add("market-search");
-    Stream.of(sortTickerButton, sortPriceButton, sortChangeButton, sortOwnedButton)
+    Stream.of(sortTickerButton, sortPriceButton, sortChangeButton,
+                    sortWeekChangeButton, sortOwnedButton)
             .forEach(b -> b.getStyleClass().add("market-filter-btn"));
 
     stocksScroll.getStyleClass().add("market-scroll");
@@ -223,7 +230,8 @@ public MarketSort getCurrentSort() {
    *
    * <p>The change button doubles as a winners/losers cycle - its label
    * updates to reflect the active mode so the user can tell which one
-   * they're currently looking at.</p>
+   * they're currently looking at. The week button does the same for
+   * best-of-week and worst-of-week.</p>
    *
    * @param sort the new sort mode.
    * */
@@ -237,6 +245,7 @@ public void setSort(final MarketSort sort) {
       }
     }
     refreshChangeButtonLabel();
+    refreshWeekChangeButtonLabel();
     renderStocks();
   }
 
@@ -256,11 +265,28 @@ private void refreshChangeButtonLabel() {
     });
   }
 
+  /**
+   * Updates the label on the week-change button the same way as
+   * {@link #refreshChangeButtonLabel()}, but for the best/worst-of-week
+   * cycle.
+   * */
+  private void refreshWeekChangeButtonLabel() {
+    if (sortWeekChangeButton == null) {
+      return;
+    }
+    sortWeekChangeButton.setText(switch (currentSort) {
+      case BEST_WEEK -> "best of week";
+      case WORST_WEEK -> "worst of week";
+      default -> "week";
+    });
+  }
+
   /**
    * Rebuilds the stock card grid based on the current search term and
    * sort mode.
    *
-   * <p>{@link MarketSort#WINNERS}, {@link MarketSort#LOSERS} and
+   * <p>{@link MarketSort#WINNERS}, {@link MarketSort#LOSERS},
+   * {@link MarketSort#BEST_WEEK}, {@link MarketSort#WORST_WEEK} and
    * {@link MarketSort#OWNED} act as filters: in those modes the grid
    * only shows the matching subset of stocks. The other modes show
    * every stock that matches the search term.</p>
@@ -301,6 +327,8 @@ private boolean matchesSortFilter(final Stock stock) {
     return switch (currentSort) {
       case WINNERS -> changePercent(stock) > 0;
       case LOSERS -> changePercent(stock) < 0;
+      case BEST_WEEK -> weekChangePercent(stock) > 0;
+      case WORST_WEEK -> weekChangePercent(stock) < 0;
       case OWNED -> ownedLookup.applyAsInt(stock.getSymbol()) > 0;
       default -> true;
     };
@@ -315,6 +343,8 @@ private String emptyMessageFor(final MarketSort sort) {
     return switch (sort) {
       case WINNERS -> "no winners right now";
       case LOSERS -> "no losers right now";
+      case BEST_WEEK -> "no stocks went up this week";
+      case WORST_WEEK -> "no stocks went down this week";
       case OWNED -> "you don't own any stocks yet";
       default -> "no stocks match your search";
     };
@@ -331,6 +361,10 @@ private Comparator<Stock> comparatorFor(final MarketSort sort) {
               (Stock s) -> changePercent(s)).reversed();
       case LOSERS -> Comparator.comparingDouble(
               (Stock s) -> changePercent(s));
+      case BEST_WEEK -> Comparator.comparingDouble(
+              (Stock s) -> weekChangePercent(s)).reversed();
+      case WORST_WEEK -> Comparator.comparingDouble(
+              (Stock s) -> weekChangePercent(s));
       case OWNED -> Comparator.comparingInt(
               (Stock s) -> ownedLookup.applyAsInt(s.getSymbol())).reversed();
     };
@@ -353,6 +387,24 @@ private double changePercent(final Stock stock) {
     return ((end - start) / start) * 100.0;
   }
 
+  /**
+   * Calculates the change percentage between the previous week's price
+   * and the current week's price. Each entry in the price history
+   * represents one week, so this is just the last two prices.
+   * */
+  private double weekChangePercent(final Stock stock) {
+    List<BigDecimal> prices = stock.getHistoricalPrices();
+    if (prices.size() < 2) {
+      return 0.0;
+    }
+    double previous = prices.get(prices.size() - 2).doubleValue();
+    double current = prices.getLast().doubleValue();
+    if (previous == 0.0) {
+      return 0.0;
+    }
+    return ((current - previous) / previous) * 100.0;
+  }
+
   /**
    * Builds a single stock card. The card is clickable and forwards the
    * selection to the registered {@code onStockSelected} consumer.