diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index 12cce41f7..9a19090a2 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -140,16 +140,27 @@ void GroupStatistics::Clear()
 	assert(delta == 1 || delta == -1);
 
 	GroupStatistics &stats_all = GroupStatistics::GetAllGroup(v);
-	GroupStatistics &stats = GroupStatistics::Get(v);
-
 	stats_all.num_vehicle += delta;
-	stats.num_vehicle += delta;
-
 	if (v->age > VEHICLE_PROFIT_MIN_AGE) {
 		stats_all.num_profit_vehicle += delta;
 		stats_all.profit_last_year += v->GetDisplayProfitLastYear() * delta;
-		stats.num_profit_vehicle += delta;
-		stats.profit_last_year += v->GetDisplayProfitLastYear() * delta;
+	}
+
+	if (IsDefaultGroupID(v->group_id)) {
+		GroupStatistics &stats = GroupStatistics::Get(v);
+		stats.num_vehicle += delta;
+		if (v->age > VEHICLE_PROFIT_MIN_AGE) {
+			stats.num_profit_vehicle += delta;
+			stats.profit_last_year += v->GetDisplayProfitLastYear() * delta;
+		}
+	} else {
+		for (Group *g = Group::Get(v->group_id); g != NULL; g = Group::GetIfValid(g->parent)) {
+			g->statistics.num_vehicle += delta;
+			if (v->age > VEHICLE_PROFIT_MIN_AGE) {
+				g->statistics.num_profit_vehicle += delta;
+				g->statistics.profit_last_year += v->GetDisplayProfitLastYear() * delta;
+			}
+		}
 	}
 }
 
@@ -171,12 +182,19 @@ void GroupStatistics::Clear()
 /* static */ void GroupStatistics::VehicleReachedProfitAge(const Vehicle *v)
 {
 	GroupStatistics &stats_all = GroupStatistics::GetAllGroup(v);
-	GroupStatistics &stats = GroupStatistics::Get(v);
-
 	stats_all.num_profit_vehicle++;
 	stats_all.profit_last_year += v->GetDisplayProfitLastYear();
-	stats.num_profit_vehicle++;
-	stats.profit_last_year += v->GetDisplayProfitLastYear();
+
+	if (IsDefaultGroupID(v->group_id)) {
+		GroupStatistics &stats = GroupStatistics::Get(v);
+		stats.num_profit_vehicle++;
+		stats.profit_last_year += v->GetDisplayProfitLastYear();
+	} else {
+		for (Group *g = Group::Get(v->group_id); g != NULL; g = Group::GetIfValid(g->parent)) {
+			g->statistics.num_profit_vehicle++;
+			g->statistics.profit_last_year += v->GetDisplayProfitLastYear();
+		}
+	}
 }
 
 /**
@@ -396,7 +414,7 @@ CommandCost CmdAlterGroup(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 		}
 	} else {
 		/* Set group parent */
-		const Group *pg = Group::GetIfValid(GB(p2, 0, 16));
+		Group *pg = Group::GetIfValid(GB(p2, 0, 16));
 
 		if (pg != NULL) {
 			if (pg->owner != _current_company) return CMD_ERROR;
@@ -408,7 +426,21 @@ CommandCost CmdAlterGroup(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 		}
 
 		if (flags & DC_EXEC) {
+			/* The vehicles of a group affect not only the group's stats, but also the stats of parent groups.
+			 * When moving the group, the stats of the parent groups at the old and new position need to be updated. */
+			for (Group *g2 = Group::GetIfValid(g->parent); g2 != NULL; g2 = Group::GetIfValid(g2->parent)) {
+				g2->statistics.num_vehicle -= g->statistics.num_vehicle;
+				g2->statistics.num_profit_vehicle -= g->statistics.num_profit_vehicle;
+				g2->statistics.profit_last_year -= g->statistics.profit_last_year;
+			}
+
 			g->parent = (pg == NULL) ? INVALID_GROUP : pg->index;
+
+			for (Group *g2 = pg; g2 != NULL; g2 = Group::GetIfValid(g2->parent)) {
+				g2->statistics.num_vehicle += g->statistics.num_vehicle;
+				g2->statistics.num_profit_vehicle += g->statistics.num_profit_vehicle;
+				g2->statistics.profit_last_year += g->statistics.profit_last_year;
+			}
 		}
 	}