Hello Sam. Thank you for your reply. This is how the SaveData method in the controller looks like: 

[HttpPost]
public ActionResult SaveData()
{

   GridModel gridModel = new GridModel();
   List<Transaction<Employee>> transactions = gridModel.LoadTransactions<Employee>...

   (HttpContext.Request.Form["ig_transactions"]);

   // here im getting the changes of the employee table. This works fine

   //But how do I get the changes of my company? 

   foreach (Transaction<Employee> t in transactions)
   {
        //do something..
   }

   JsonResult result = new JsonResult();
   Dictionary<string, bool> response = new Dictionary<string, bool>();
   response.Add("Success", true);
   result.Data = response;
   return result;
}

I tryed putting the input element inside the curly brackets of the form, but it didnt work. 

This is how my complete view looks like:

<!-- Ignite UI Required Combined CSS Files -->
<link href="http://cdn-na.infragistics.com/igniteui/2016.1/latest/css/themes/infragistics/infragistics.theme.css" rel="stylesheet" type="text/css" />
<link href="http://cdn-na.infragistics.com/igniteui/2016.1/latest/css/structure/infragistics.css" rel="stylesheet" type="text/css" />

<script src="http://ajax.aspnetcdn.com/ajax/modernizr/modernizr-2.8.3.js" type="text/javascript"></script>
<script src="http://code.jquery.com/jquery-1.9.1.min.js" type="text/javascript"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.min.js" type="text/javascript"></script>

<!-- Ignite UI Required Combined JavaScript Files -->
<script src="http://cdn-na.infragistics.com/igniteui/2016.1/latest/js/infragistics.core.js" type="text/javascript"></script>
<script src="http://cdn-na.infragistics.com/igniteui/2016.1/latest/js/infragistics.lob.js" type="text/javascript"></script>
<!-- Used to add modal loading indicator for igGrid -->
<script src="http://www.igniteui.com/js/grid-modal-loading-inicator.js"></script>

@using Infragistics.Web.Mvc
@model WebApplication1.Models.Company
@{
ViewBag.Title = "Index";
}
<h2>Edit - Company</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<hr />
<div class="form-group">
@Html.LabelFor(model => model.CompanyName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.CompanyName, new { htmlAttributes = new { @class = "form-control" } })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Address, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Address, new { htmlAttributes = new { @class = "form-control" } })
</div>
</div>
</div>
<hr />
<hr />
<h2>Employee List</h2>
@(Html.Infragistics()
.Grid(Model.EmployeeList).ID("Grid").Width("100%").Height("150px").PrimaryKey("ID")
.AutoGenerateColumns(false).AutoGenerateLayouts(false).EnableHoverStyles(false)
.Columns(column =>
{
column.For(x => x.FirstName).HeaderText("First Name").Width("40%");
column.For(x => x.LastName).HeaderText("Last Name").Width("40%");
})
.Features(features =>
{
features.Updating().ColumnSettings(cs =>
{
}).EnableAddRow(false).EnableDeleteRow(false);
})
.UpdateUrl(Url.Action("SaveData"))
.DataBind()
.Render()
)
<input type="button" id="saveChanges" class="button-style" value="Save" />
}

<script>
var updates, loadingIndicator;

$(function () {
var grid = $("#Grid"), comboDataSource = {};
$("#saveChanges").igButton({ labelText: $("#saveChanges").val(), disabled: false });

loadingIndicator = new GridModalLoadingIndicator(grid);

$("#saveChanges").on('igbuttonclick',
function (e) {

grid.igGrid("saveChanges", function saveSuccess() {
loadingIndicator.hide();
});
loadingIndicator.show();
return false;
}
);
});

</script>