diff --git a/components/fpspreadsheet/fpspreadsheet.pas b/components/fpspreadsheet/fpspreadsheet.pas
index 9742e94e6..d8b4af859 100755
--- a/components/fpspreadsheet/fpspreadsheet.pas
+++ b/components/fpspreadsheet/fpspreadsheet.pas
@@ -5113,7 +5113,7 @@ var
   cellnode: TAVLTreeNode;
   col: PCol;
   i: Integer;
-  r, c, ic: Cardinal;
+  r, c, cc: Cardinal;
   r1, c1, r2, c2: Cardinal;
   rLast, cLast: Cardinal;
   cell, nextcell, gapcell, oldbase, newbase: PCell;
@@ -5160,7 +5160,38 @@ begin
           gapcell := GetCell(r, ACol);
           gapcell^.Mergebase := cell^.MergeBase;
         end;
+      end
+      else
+      // A shared formula block is found immediately to the left of the
+      // inserted column. If it extends to the right we have to create a new
+      // shared formula base in the upper left cell. Note: Excel does not
+      // extend the shared formula to the inserted column.
+      if cell^.SharedFormulaBase <> nil then begin
+        oldbase := cell^.SharedFormulaBase;
+        // Does it extend to the right of the new column?
+        nextcell := FindCell(r, ACol+1);
+        if Assigned(nextcell) and (nextcell^.SharedFormulaBase = oldbase) then
+        begin
+          // Yes.
+          // It next cell is in the top row of the block we make it a shared formula base
+          if r = oldbase^.Row then
+          begin
+            newbase := nextcell;
+            nextcell^.SharedFormulaBase := nextcell;
+            nextcell^.FormulaValue := InsertColToFormula(ACol, oldbase);      // ??
+            // Note: the references are not correct here - we fix that later!
+          end;
+          // Use the new shared formulabase in all cells of the old block at the right
+          for cc := ACol+1 to cLast do
+          begin
+            cell := FindCell(r, cc);
+            if (cell = nil) or (cell^.SharedFormulaBase <> oldbase) then
+              break;
+            cell^.SharedFormulaBase := newbase;
+          end;
+        end;
       end;
+
       (*
       else
       // A shared formula block is found immediately before the inserted column
@@ -5198,6 +5229,8 @@ begin
       *)
     end;
 
+    // Fix shared formulas:
+    // A shared formula block may break into two pieces if cell references Cell references to the left and to the right of
     // Seek along the column immediately to the left of the inserted column
     c := ACol - 1;
     for r := 0 to rLast do
@@ -5228,9 +5261,9 @@ begin
           end;
           // Now link all cells to the right of the new column (which still
           // use the old base) to the new base
-          for ic := ACol+1 to cLast do
+          for cc := ACol+1 to cLast do
           begin
-            cell := FindCell(r, ic);
+            cell := FindCell(r, cc);
             if (cell = nil) or (cell^.SharedFormulaBase <> oldbase) then
               break;
             cell^.SharedFormulaBase := newbase;
diff --git a/components/fpspreadsheet/xlsxooxml.pas b/components/fpspreadsheet/xlsxooxml.pas
index 6d526f351..772e2be41 100755
--- a/components/fpspreadsheet/xlsxooxml.pas
+++ b/components/fpspreadsheet/xlsxooxml.pas
@@ -65,6 +65,7 @@ type
     FFillList: TFPList;
     FBorderList: TFPList;
     FThemeColors: array of TsColorValue;
+    FSharedFormulas: TStringList;
     FWrittenByFPS: Boolean;
     procedure ReadBorders(ANode: TDOMNode);
     procedure ReadCell(ANode: TDOMNode; AWorksheet: TsWorksheet);
@@ -395,6 +396,8 @@ begin
   // Set up the default palette in order to have the default color names correct.
   Workbook.UseDefaultPalette;
 
+  FSharedFormulas := TStringList.Create;
+
   FSharedStrings := TStringList.Create;
   FFillList := TFPList.Create;
   FBorderList := TFPList.Create;
@@ -418,6 +421,7 @@ begin
   FBorderList.Free;
 
   FSharedStrings.Free;
+  FSharedFormulas.Free;
 
   inherited Destroy;
 end;
@@ -610,7 +614,7 @@ end;
 
 procedure TsSpreadOOXMLReader.ReadCell(ANode: TDOMNode; AWorksheet: TsWorksheet);
 var
-  s: String;
+  addr, s: String;
   rowIndex, colIndex: Cardinal;
   cell: PCell;
   datanode: TDOMNode;
@@ -623,8 +627,8 @@ begin
     exit;
 
   // get row and column address
-  s := GetAttrValue(ANode, 'r');       // cell address, like 'A1'
-  ParseCellString(s, rowIndex, colIndex);
+  addr := GetAttrValue(ANode, 'r');       // cell address, like 'A1'
+  ParseCellString(addr, rowIndex, colIndex);
 
   // create cell
   if FIsVirtualMode then
@@ -656,11 +660,28 @@ begin
       s := GetAttrValue(datanode, 't');
       if s = 'shared' then
       begin
+        // Shared formula
         s := GetAttrValue(datanode, 'ref');
-        if (s <> '') then
-          AWorksheet.WriteSharedFormula(s, formulaStr);
+        if (s <> '') then      // This is the shared formula base
+        begin
+          s := GetAttrValue(datanode, 'si');
+          if s <> '' then
+            FSharedFormulas.AddObject(addr, Pointer(PtrInt(StrToInt(s))));
+          FWorksheet.WriteFormula(cell, formulaStr);
+          cell^.SharedFormulaBase := cell;
+          //AWorksheet.WriteSharedFormula(s, formulaStr);
+        end else
+        begin
+          s := GetAttrValue(datanode, 'si');
+          if s <> '' then
+          begin
+            s := FSharedFormulas[FSharedFormulas.IndexOfObject(Pointer(PtrInt(StrToInt(s))))];
+            cell^.SharedFormulaBase := FWorksheet.FindCell(s);
+          end;
+        end;
       end
       else
+        // "Normal" formula
         AWorksheet.WriteFormula(cell, formulaStr);
     end;
     datanode := datanode.NextSibling;