diff --git a/includes/class-partnerexpo-core-user-fields.php b/includes/class-partnerexpo-core-user-fields.php
new file mode 100644
index 0000000..425e0eb
--- /dev/null
+++ b/includes/class-partnerexpo-core-user-fields.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Used to register custom user fields.
+ *
+ * @link       https://github.com/Duskell
+ * @since      1.1.0
+ * @package    Partnerexpo_Core
+ * @subpackage Partnerexpo_Core/includes
+ * @author     Juhász Levente <juhasz.levente@rendszerepito.hu>
+ */
+class Partnerexpo_Core_User_Fields {
+    public function activate_fields() {
+        add_action( 'show_user_profile', [$this, 'add_custom_user_fields'] );
+        add_action( 'edit_user_profile', [$this, 'add_custom_user_fields'] );
+        add_action( 'personal_options_update', [$this, 'save_custom_user_fields'] );
+        add_action( 'edit_user_profile_update', [$this, 'save_custom_user_fields'] );
+        add_action( 'user_register', [$this, 'add_value_after_reg'] );
+    }
+
+    public function add_custom_user_fields( $user ) {
+        $company = get_user_meta( $user->ID, 'company', true );
+        ?>
+            <h3>Additional Information</h3>
+            <table class="form-table">
+                <tr>
+                    <th><label for="company"><?php _e( 'Cég neve', 'partnerexpo-core' ) ?></label></th>
+                    <td>
+                        <input type="text" name="company" id="company" value="<?php echo esc_attr( $company ) ?>" class="regular-text" />
+                    </td>
+                </tr>
+            </table>
+        <?php
+    }
+
+    public function save_custom_user_fields( $user_id ) {
+        if( ! isset( $_POST[ '_wpnonce' ] ) || ! wp_verify_nonce( $_POST[ '_wpnonce' ], 'update-user_' . $user_id ) ) {
+            return;
+        }
+        
+        if( ! current_user_can( 'edit_user', $user_id ) ) {
+            return;
+        }
+    
+        update_user_meta( $user_id, 'company', sanitize_text_field( $_POST[ 'company' ] ) );
+    }
+
+    public function add_value_after_reg( $user_id ) {
+        update_user_meta( $user_id, 'company', sanitize_text_field( $_POST[ 'company' ] ?? '' ) );
+    }
+}
diff --git a/includes/class-partnerexpo-core.php b/includes/class-partnerexpo-core.php
index c367b3f..9b3ee62 100644
--- a/includes/class-partnerexpo-core.php
+++ b/includes/class-partnerexpo-core.php
@@ -121,9 +121,19 @@ class Partnerexpo_Core {
 		 */
 		require_once plugin_dir_path( dirname( __FILE__ ) ) . 'public/class-partnerexpo-core-public.php';
 
+		/**
+		 * Used to have relevance-based search results.
+		 */
 		require_once plugin_dir_path( dirname( __FILE__ ) ) . 'includes/dependency/class-query-w-relevance.php';
 
+		/**
+		 * The class responsible for registering custom user fields.
+		 */
+		require_once plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-partnerexpo-core-user-fields.php';
+
 		$this->loader = new Partnerexpo_Core_Loader();
+		$user_fields = new Partnerexpo_Core_User_Fields();
+		$user_fields->activate_fields();
 
 	}
 
@@ -209,7 +219,7 @@ class Partnerexpo_Core {
 			'public' 		  => true,
 			'has_archive' 	  => false,
 			'show_in_rest' 	  => true,
-			'supports' 		  => [ 'title', 'editor', 'thumbnail', 'excerpt' ],
+			'supports' 		  => [ 'title', 'editor', 'thumbnail', 'excerpt', 'author' ],
 			'rewrite' 		  => [ 
 				'slug'  => __( 'partnerek', 'partnerexpo-core' ),
 				'pages' => false,
diff --git a/public/class-partnerexpo-core-public.php b/public/class-partnerexpo-core-public.php
index 3f97736..6e46607 100644
--- a/public/class-partnerexpo-core-public.php
+++ b/public/class-partnerexpo-core-public.php
@@ -70,6 +70,15 @@ class Partnerexpo_Core_Public {
 			$params['tags'] = str_replace(',', '+', $params['tags']);
 		}
 
+		$companies = explode(',', $params['companies'] ?? '');
+
+		$authors = get_users([
+			'meta_key' => 'company',
+			'meta_value' => $companies,
+			'meta_compare' => 'IN',
+			'fields' => 'ID',
+		]);
+
 		$args = [
 			'post_type'      => 'pexpo_partners',
 			'posts_per_page' => $params['resultsPerPage'] ?? 10,
@@ -79,6 +88,10 @@ class Partnerexpo_Core_Public {
 			'pexpo_tags'	 => $params['tags'] ?? '',
 		];
 
+		if (!empty($authors)) {
+			$args['author__in'] = array_values($authors);
+		}
+
 		if ( ! empty( $params['tags'] ) ) {
 			$tag_string = $params['tags'];
 			$operator   = 'IN';
diff --git a/public/js/searchbox.js b/public/js/searchbox.js
index 3a09f37..86fe613 100644
--- a/public/js/searchbox.js
+++ b/public/js/searchbox.js
@@ -14,6 +14,7 @@ class PartnerExpoSearch {
       drawerBackdrop: document.getElementById("pexpo-core-drawerBackdrop"),
       filterFTag: document.getElementById("pexpo-core-tag-toggle"),
       filterTags: document.getElementById("pexpo-core-tags"),
+      filterCompanies: document.getElementById("pexpo-core-companies"),
       qInput: document.getElementById("pexpo-core-q"),
       masonry: document.getElementById("pexpo-core-masonry"),
       measure: document.getElementById("pexpo-core-measure"),
@@ -33,6 +34,7 @@ class PartnerExpoSearch {
         sort: "relevance",
         force_tags: false,
         tags: [],
+        companies: [],
         resultsPerPage: 20,
         page: 1,
       },
@@ -72,7 +74,6 @@ class PartnerExpoSearch {
   initMultiSelect() {
     if (typeof MultiSelect !== 'undefined') {
       new MultiSelect(this.els.filterTags, {
-        placeholder: 'Címkék kiválasztása',
         search: true,
         selectAll: false,
         onSelect: (value) => {
@@ -84,6 +85,19 @@ class PartnerExpoSearch {
           this.state.filters.tags = this.state.filters.tags.filter(tag => tag !== value);
         }
       });
+
+      new MultiSelect(this.els.filterCompanies, {
+        search: true,
+        selectAll: false,
+        onSelect: (value) => {
+          if (!this.state.filters.companies.includes(value)) {
+            this.state.filters.companies.push(value);
+          }
+        },
+        onUnselect: (value) => {
+          this.state.filters.companies = this.state.filters.companies.filter(company => company !== value);
+        }
+      });
     } else {
       console.warn("MultiSelect library not found.");
     }
diff --git a/public/partials/partnerexpo-core-public-searchbox.php b/public/partials/partnerexpo-core-public-searchbox.php
index 54bb1ae..db1810d 100644
--- a/public/partials/partnerexpo-core-public-searchbox.php
+++ b/public/partials/partnerexpo-core-public-searchbox.php
@@ -15,8 +15,28 @@ $tags = get_terms([
     'hide_empty' => false,
 ]);
 
-?>
+$users = get_users([
+    'meta_key' => 'company',
+    'meta_compare' => 'EXISTS',
+]);
 
+$companies = [];
+foreach ($users as $user) {
+    $company = get_user_meta($user->ID, 'company', true);
+    if (!empty($company)) {
+        $companies[$company] = $company;
+    }
+}
+
+$authors = get_users([
+			'meta_key' => 'company',
+			'meta_value' => array_keys($companies) ?? [],
+			'meta_compare' => 'IN',
+			'fields' => 'ID',
+		]);
+
+
+?>
 <div class="pexpo-core-root pexpo-core-shell" id="pexpo-core-shell">
   <div class="pexpo-core-topbar" id="pexpo-core-topbar">
     <div class="pexpo-core-filterWrap" id="pexpo-core-filterWrap">
@@ -64,6 +84,12 @@ $tags = get_terms([
           <option value="<?php echo esc_attr($tag->slug); ?>"><?php echo esc_html($tag->name); ?></option>
         <?php endforeach; ?>
       </select>
+      <label for="pexpo-core-companies"><?php echo esc_html__('Cégek', 'partnerexpo-core'); ?></label>
+      <select id="pexpo-core-companies" data-placeholder="<?php echo esc_attr__('Cégek kiválasztása', 'partnerexpo-core'); ?>" data-search-text="<?php echo esc_attr__('Keresés...', 'partnerexpo-core'); ?>" multiple="multiple">
+        <?php foreach ($companies as $key => $company) : ?>
+          <option value="<?php echo esc_attr($key); ?>"><?php echo esc_html($company); ?></option>
+        <?php endforeach; ?>
+      </select>
       <button id="pexpo-core-filterApply"><?php echo esc_html__('Alkalmaz', 'partnerexpo-core'); ?></button>
     </div>
   </div>