diff --git a/src/companies.php b/src/companies.php
new file mode 100644
index 0000000..787f665
--- /dev/null
+++ b/src/companies.php
@@ -0,0 +1,114 @@
+<?php
+require_once("core.php");
+security::checkType(security::ADMIN);
+
+$mdHeaderRowBefore = visual::backBtn("settings.php");
+?>
+<!DOCTYPE html>
+<html>
+<head>
+  <title><?php echo $conf["appName"]; ?></title>
+  <?php visual::includeHead(); ?>
+  <link rel="stylesheet" href="css/dashboard.css">
+
+  <style>
+  .addcompany {
+    position: fixed;
+    bottom: 16px;
+    right: 16px;
+    z-index: 1000;
+  }
+
+  @media (max-width: 655px) {
+    .extra {
+      display: none;
+    }
+  }
+  </style>
+</head>
+<?php visual::printBodyTag(); ?>
+  <div class="mdl-layout mdl-js-layout mdl-layout--fixed-header mdl-layout--fixed-drawer">
+    <?php visual::includeNav(); ?>
+    <button class="addcompany mdl-button md-js-button mdl-button--fab mdl-js-ripple-effect mdl-button--accent"><i class="material-icons">add</i><span class="mdl-ripple"></span></button>
+    <main class="mdl-layout__content">
+      <div class="page-content">
+        <div class="main mdl-shadow--4dp">
+          <h2>Empresas</h2>
+          <?php
+          $companies = companies::getAll(false);
+          if (count($companies)) {
+            ?>
+            <div class="overflow-wrapper overflow-wrapper--for-table">
+              <table class="mdl-data-table mdl-js-data-table mdl-shadow--2dp">
+                <thead>
+                  <tr>
+                    <th class="extra">ID</th>
+                    <th class="mdl-data-table__cell--non-numeric">Empresa</th>
+                    <th class="mdl-data-table__cell--non-numeric">CIF</th>
+                    <th class="mdl-data-table__cell--non-numeric"></th>
+                  </tr>
+                </thead>
+                <tbody>
+                  <?php
+                  foreach ($companies as $c) {
+                    ?>
+                    <tr>
+                      <td class="extra"><?=(int)$c["id"]?></td>
+                      <td class="mdl-data-table__cell--non-numeric"><?=security::htmlsafe($c["name"])?></td>
+                      <td class="mdl-data-table__cell--non-numeric"><?=(empty($c["cif"]) ? "-" : security::htmlsafe($c["cif"]))?></td>
+                      <td class='mdl-data-table__cell--non-numeric'><a href='dynamic/editcompany.php?id=<?=(int)$c["id"]?>' data-dyndialog-href='dynamic/editcompany.php?id=<?=(int)$c["id"]?>' title='Editar empresa'><i class='material-icons icon'>edit</i></a></td>
+                    </tr>
+                    <?php
+                  }
+                  ?>
+                </tbody>
+              </table>
+            </div>
+            <?php
+          } else {
+            ?>
+            <p>Todavía no hay definida ninguna empresa.</p>
+            <p>Puedes añadir una haciendo clic en el botón de la esquina inferior derecha de la página.</p>
+            <?php
+          }
+          ?>
+
+          <?php visual::printDebug("companies::getAll()", $companies); ?>
+        </div>
+      </div>
+    </main>
+  </div>
+
+  <dialog class="mdl-dialog" id="addcompany">
+    <form action="doaddcompany.php" method="POST" autocomplete="off">
+      <h4 class="mdl-dialog__title">Añade una empresa</h4>
+      <div class="mdl-dialog__content">
+        <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
+          <input class="mdl-textfield__input" type="text" name="name" id="name" autocomplete="off" data-required>
+          <label class="mdl-textfield__label" for="name">Nombre de la empresa</label>
+        </div>
+        <br>
+        <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
+          <input class="mdl-textfield__input" type="text" name="cif" id="cif" autocomplete="off">
+          <label class="mdl-textfield__label" for="cif">CIF (opcional)</label>
+        </div>
+      </div>
+      <div class="mdl-dialog__actions">
+        <button type="submit" class="mdl-button mdl-js-button mdl-js-ripple-effect mdl-button--accent">Añadir</button>
+        <button onclick="event.preventDefault(); document.querySelector('#addcompany').close();" class="mdl-button mdl-js-button mdl-js-ripple-effect cancel">Cancelar</button>
+      </div>
+    </form>
+  </dialog>
+
+  <?php
+  visual::smartSnackbar([
+    ["added", "Se ha añadido la empresa correctamente."],
+    ["modified", "Se ha modificado la empresa correctamente."],
+    ["empty", "Faltan datos por introducir en el formulario."],
+    ["unexpected", "Ha ocurrido un error inesperado. Inténtelo de nuevo en unos segundos."]
+  ]);
+  ?>
+
+  <script src="js/companies.js"></script>
+</body>
+</html>