diff --git a/includes/Modules/Analytics_4/Email_Reporting/Report_Data_Builder.php b/includes/Modules/Analytics_4/Email_Reporting/Report_Data_Builder.php
index 8aa9b3175b3..34c8e5efe0e 100644
--- a/includes/Modules/Analytics_4/Email_Reporting/Report_Data_Builder.php
+++ b/includes/Modules/Analytics_4/Email_Reporting/Report_Data_Builder.php
@@ -84,9 +84,14 @@ public function __construct( ?Email_Report_Payload_Processor $report_processor =
 	 * @return array Section payloads.
 	 */
 	public function build_sections_from_module_payload( $module_payload ) {
-		$sections = array();
+		$sections              = array();
+		$top_channels_by_event = $this->extract_top_channels_by_event( $module_payload );
 
 		foreach ( $module_payload as $section_key => $section_data ) {
+			if ( $this->is_conversion_event_top_channel_key( $section_key ) ) {
+				continue;
+			}
+
 			list( $reports ) = $this->normalize_section_input( $section_data );
 
 			foreach ( $reports as $report ) {
@@ -109,6 +114,8 @@ public function build_sections_from_module_payload( $module_payload ) {
 					$payload['title'] = '';
 				}
 
+				$payload = $this->maybe_merge_conversion_event_top_channel( $payload, $section_key, $top_channels_by_event );
+
 				$sections[] = $payload;
 			}
 		}
@@ -265,4 +272,134 @@ function ( $dimension_value ) {
 
 		return array( $formatted_values, $labels );
 	}
+
+	/**
+	 * Extracts top traffic channels from conversion sidecar payloads.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param array $module_payload Analytics module payload.
+	 * @return array Event slug => top channel.
+	 */
+	private function extract_top_channels_by_event( $module_payload ) {
+		$top_channels_by_event = array();
+
+		if ( ! is_array( $module_payload ) ) {
+			return $top_channels_by_event;
+		}
+
+		foreach ( $module_payload as $section_key => $section_data ) {
+			if ( ! $this->is_conversion_event_top_channel_key( $section_key ) ) {
+				continue;
+			}
+
+			$event_slug = $this->get_conversion_event_slug_from_top_channel_key( $section_key );
+			if ( '' === $event_slug ) {
+				continue;
+			}
+
+			$top_channel = $this->extract_top_channel_from_section_data( $section_data );
+			if ( '' === $top_channel ) {
+				continue;
+			}
+
+			$top_channels_by_event[ $event_slug ] = $top_channel;
+		}
+
+		return $top_channels_by_event;
+	}
+
+	/**
+	 * Merges sidecar top-channel data into a conversion-event payload.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param array  $payload               Section payload.
+	 * @param string $section_key           Section key.
+	 * @param array  $top_channels_by_event Event slug => top channel map.
+	 * @return array Section payload.
+	 */
+	private function maybe_merge_conversion_event_top_channel( $payload, $section_key, $top_channels_by_event ) {
+		if ( 0 !== strpos( $section_key, 'conversion_event_' ) ) {
+			return $payload;
+		}
+
+		$event_slug = substr( $section_key, strlen( 'conversion_event_' ) );
+		if ( '' === $event_slug ) {
+			return $payload;
+		}
+
+		if ( empty( $top_channels_by_event[ $event_slug ] ) ) {
+			$payload['dimensions']       = array();
+			$payload['dimension_values'] = array();
+
+			return $payload;
+		}
+
+		$payload['dimensions']       = array( 'sessionDefaultChannelGroup' );
+		$payload['dimension_values'] = array( $top_channels_by_event[ $event_slug ] );
+
+		return $payload;
+	}
+
+	/**
+	 * Extracts the top channel value from sidecar report data.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param mixed $section_data Section data for a top-channel request.
+	 * @return string Top channel value, or empty string when unavailable.
+	 */
+	private function extract_top_channel_from_section_data( $section_data ) {
+		list( $reports ) = $this->normalize_section_input( $section_data );
+		if ( empty( $reports ) ) {
+			return '';
+		}
+
+		foreach ( $reports as $report ) {
+			$processed_report = $this->report_processor->process_single_report( $report );
+			$rows             = $processed_report['rows'] ?? array();
+
+			if ( empty( $rows ) || ! is_array( $rows ) ) {
+				continue;
+			}
+
+			foreach ( $rows as $row ) {
+				$top_channel = $row['dimensions']['sessionDefaultChannelGroup'] ?? '';
+				if ( '' !== $top_channel ) {
+					return $top_channel;
+				}
+			}
+		}
+
+		return '';
+	}
+
+	/**
+	 * Determines whether section key is a conversion top-channel sidecar key.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param string $section_key Section key.
+	 * @return bool True when key is a conversion top-channel key.
+	 */
+	private function is_conversion_event_top_channel_key( $section_key ) {
+		return 0 === strpos( $section_key, 'conversion_event_top_channel_' );
+	}
+
+	/**
+	 * Gets conversion event slug from a top-channel sidecar key.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param string $section_key Section key.
+	 * @return string Conversion event slug.
+	 */
+	private function get_conversion_event_slug_from_top_channel_key( $section_key ) {
+		if ( ! $this->is_conversion_event_top_channel_key( $section_key ) ) {
+			return '';
+		}
+
+		return substr( $section_key, strlen( 'conversion_event_top_channel_' ) );
+	}
 }
diff --git a/includes/Modules/Analytics_4/Email_Reporting/Report_Options.php b/includes/Modules/Analytics_4/Email_Reporting/Report_Options.php
index 534ec4ced5a..c04254e1212 100644
--- a/includes/Modules/Analytics_4/Email_Reporting/Report_Options.php
+++ b/includes/Modules/Analytics_4/Email_Reporting/Report_Options.php
@@ -213,6 +213,30 @@ public function get_total_conversion_events_options() {
 	 * @return array Report request options array.
 	 */
 	public function get_conversion_event_options( string $event_name ) {
+		return $this->with_current_range(
+			array(
+				'metrics'          => array(
+					array( 'name' => 'eventCount' ),
+				),
+				'dimensionFilters' => array(
+					'eventName' => array(
+						'value' => $event_name,
+					),
+				),
+				'keepEmptyRows'    => true,
+			)
+		);
+	}
+
+	/**
+	 * Gets report options for top conversion channel by event.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param string $event_name Conversion event name.
+	 * @return array Report request options array.
+	 */
+	public function get_conversion_event_top_channel_options( string $event_name ) {
 		return $this->with_current_range(
 			array(
 				'metrics'          => array(
diff --git a/includes/Modules/Analytics_4/Email_Reporting/Report_Request_Assembler.php b/includes/Modules/Analytics_4/Email_Reporting/Report_Request_Assembler.php
index 57a4c002c6e..c6ee2289a75 100644
--- a/includes/Modules/Analytics_4/Email_Reporting/Report_Request_Assembler.php
+++ b/includes/Modules/Analytics_4/Email_Reporting/Report_Request_Assembler.php
@@ -69,6 +69,7 @@ public function build_requests( array $custom_titles = array() ) {
 				}
 
 				$requests[ $request_key ] = $this->report_options->get_conversion_event_options( $event_name );
+				$requests[ sprintf( 'conversion_event_top_channel_%s', $event_name_slug ) ] = $this->report_options->get_conversion_event_top_channel_options( $event_name );
 			}
 		}
 
diff --git a/tests/phpunit/integration/Core/Email_Reporting/Email_Report_Section_BuilderTest.php b/tests/phpunit/integration/Core/Email_Reporting/Email_Report_Section_BuilderTest.php
index 19a8195d9fc..44330680be2 100644
--- a/tests/phpunit/integration/Core/Email_Reporting/Email_Report_Section_BuilderTest.php
+++ b/tests/phpunit/integration/Core/Email_Reporting/Email_Report_Section_BuilderTest.php
@@ -14,6 +14,9 @@
 use Google\Site_Kit\Core\Email_Reporting\Email_Log;
 use Google\Site_Kit\Core\Email_Reporting\Email_Report_Section_Builder;
 use Google\Site_Kit\Core\Email_Reporting\Email_Report_Data_Section_Part;
+use Google\Site_Kit\Core\Email_Reporting\Sections_Map;
+use Google\Site_Kit\Core\Golinks\Dashboard_Golink_Handler;
+use Google\Site_Kit\Core\Golinks\Golinks;
 use Google\Site_Kit\Tests\TestCase;
 
 class Email_Report_Section_BuilderTest extends TestCase {
@@ -139,4 +142,180 @@ public function test_build_sections__returns_wp_error_for_search_console_error_p
 		$this->assertWPError( $sections, 'Search Console errors should be propagated as WP_Error.' );
 		$this->assertSame( 'email_report_search_console_missing_result', $sections->get_error_code(), 'Expected original Search Console error code to be preserved.' );
 	}
+
+	public function test_build_sections__uses_total_conversion_count_and_top_channel_sidecar_data() {
+		$context = new Context( GOOGLESITEKIT_PLUGIN_MAIN_FILE );
+		$builder = new Email_Report_Section_Builder( $context );
+
+		$payloads = array(
+			array(
+				'total_conversion_events'                  => $this->get_conversion_event_total_report( '90' ),
+				'conversion_event_add_to_cart'             => $this->get_conversion_event_total_report( '50' ),
+				'conversion_event_begin_checkout'          => $this->get_conversion_event_total_report( '30' ),
+				'conversion_event_purchase'                => $this->get_conversion_event_total_report( '10' ),
+				'conversion_event_top_channel_add_to_cart' => $this->get_conversion_event_top_channel_report( 'Organic Search', '5' ),
+				'conversion_event_top_channel_begin_checkout' => $this->get_conversion_event_top_channel_report( 'Direct', '7' ),
+				'conversion_event_top_channel_purchase'    => $this->get_conversion_event_top_channel_report( 'Paid Search', '999' ),
+			),
+		);
+
+		$sections = $builder->build_sections( 'analytics-4', $payloads, 'en_US' );
+
+		$this->assertIsArray( $sections, 'Expected analytics sections array.' );
+		$this->assertCount( 4, $sections, 'Expected total plus three conversion event sections; top-channel sidecar reports should not render as standalone sections.' );
+
+		$section_by_key = $this->map_sections_by_key( $sections );
+
+		$this->assertArrayNotHasKey( 'conversion_event_top_channel_add_to_cart', $section_by_key, 'Top-channel sidecar payload should not become a standalone section.' );
+		$this->assertArrayHasKey( 'conversion_event_add_to_cart', $section_by_key, 'Expected conversion event section to be present.' );
+
+		$add_to_cart_section = $section_by_key['conversion_event_add_to_cart'];
+		$this->assertSame( array( '50' ), $add_to_cart_section->get_values(), 'Conversion event value should come from total event count.' );
+		$this->assertSame( array( 'sessionDefaultChannelGroup' ), $add_to_cart_section->get_dimensions(), 'Conversion event should expose top-channel dimension only when sidecar data exists.' );
+		$this->assertSame( array( 'Organic Search' ), $add_to_cart_section->get_dimension_values(), 'Conversion event top channel should be merged from sidecar payload.' );
+
+		$sections_payload = $this->to_sections_payload( $sections );
+		$golinks          = new Golinks( $context );
+		$golinks->register_handler( 'dashboard', new Dashboard_Golink_Handler() );
+		$sections_map = new Sections_Map( $context, $sections_payload, $golinks );
+		$section_map  = $sections_map->get_sections();
+
+		$this->assertArrayHasKey( 'is_my_site_helping_my_business_grow', $section_map, 'Expected conversions section in section map.' );
+		$this->assertSame(
+			array(
+				'total_conversion_events',
+				'conversion_event_add_to_cart',
+				'conversion_event_begin_checkout',
+			),
+			array_keys( $section_map['is_my_site_helping_my_business_grow']['section_parts'] ),
+			'Conversion rows should be ranked by total event counts, not top-channel sidecar counts.'
+		);
+	}
+
+	public function test_build_sections__keeps_conversion_event_row_when_top_channel_sidecar_is_missing() {
+		$context = new Context( GOOGLESITEKIT_PLUGIN_MAIN_FILE );
+		$builder = new Email_Report_Section_Builder( $context );
+
+		$payloads = array(
+			array(
+				'total_conversion_events'      => $this->get_conversion_event_total_report( '12' ),
+				'conversion_event_add_to_cart' => $this->get_conversion_event_total_report( '4' ),
+			),
+		);
+
+		$sections = $builder->build_sections( 'analytics-4', $payloads, 'en_US' );
+
+		$this->assertIsArray( $sections, 'Expected analytics sections array.' );
+		$this->assertCount( 2, $sections, 'Expected total plus conversion event section.' );
+
+		$section_by_key = $this->map_sections_by_key( $sections );
+
+		$this->assertArrayHasKey( 'conversion_event_add_to_cart', $section_by_key, 'Conversion event should be present even when top-channel sidecar data is missing.' );
+
+		$add_to_cart_section = $section_by_key['conversion_event_add_to_cart'];
+		$this->assertSame( array( '4' ), $add_to_cart_section->get_values(), 'Conversion event value should still come from total event count.' );
+		$this->assertSame( array(), $add_to_cart_section->get_dimensions(), 'Conversion event should not expose a top-channel dimension when sidecar data is missing.' );
+		$this->assertSame( array(), $add_to_cart_section->get_dimension_values(), 'Conversion event should not expose a top-channel value when sidecar data is missing.' );
+	}
+
+	/**
+	 * Converts built section parts into section payload used by sections map.
+	 *
+	 * @param Email_Report_Data_Section_Part[] $sections Built section parts.
+	 * @return array
+	 */
+	private function to_sections_payload( array $sections ) {
+		$payload = array();
+
+		foreach ( $sections as $section ) {
+			$dimensions       = $section->get_dimensions();
+			$dimension_values = $section->get_dimension_values();
+			$first_dimension  = $dimensions[0] ?? '';
+			$first_value      = $dimension_values[0] ?? '';
+			$first_label      = is_array( $first_value ) ? ( $first_value['label'] ?? '' ) : $first_value;
+
+			$payload[ $section->get_section_key() ] = array(
+				'value'           => $section->get_values()[0] ?? '',
+				'label'           => $section->get_labels()[0] ?? '',
+				'event_name'      => $section->get_event_names()[0] ?? '',
+				'dimension'       => $first_dimension,
+				'dimension_value' => $first_label,
+				'change_context'  => 'Compared to previous 7 days',
+			);
+		}
+
+		return $payload;
+	}
+
+	/**
+	 * Builds a minimal GA4 conversion event totals report fixture.
+	 *
+	 * @param string $value Event count value.
+	 * @return array
+	 */
+	private function get_conversion_event_total_report( $value ) {
+		return array(
+			'metricHeaders' => array(
+				array(
+					'name' => 'eventCount',
+					'type' => 'TYPE_INTEGER',
+				),
+			),
+			'totals'        => array(
+				array(
+					'metricValues' => array(
+						array( 'value' => (string) $value ),
+					),
+				),
+			),
+			'rowCount'      => 1,
+		);
+	}
+
+	/**
+	 * Builds a minimal GA4 conversion event top-channel report fixture.
+	 *
+	 * @param string $channel Top channel name.
+	 * @param string $value   Event count value.
+	 * @return array
+	 */
+	private function get_conversion_event_top_channel_report( $channel, $value ) {
+		return array(
+			'dimensionHeaders' => array(
+				array( 'name' => 'sessionDefaultChannelGroup' ),
+			),
+			'metricHeaders'    => array(
+				array(
+					'name' => 'eventCount',
+					'type' => 'TYPE_INTEGER',
+				),
+			),
+			'rows'             => array(
+				array(
+					'dimensionValues' => array(
+						array( 'value' => (string) $channel ),
+					),
+					'metricValues'    => array(
+						array( 'value' => (string) $value ),
+					),
+				),
+			),
+		);
+	}
+
+	/**
+	 * Maps section parts by section key for easier assertions.
+	 *
+	 * @param Email_Report_Data_Section_Part[] $sections Built section parts.
+	 * @return Email_Report_Data_Section_Part[]
+	 */
+	private function map_sections_by_key( array $sections ) {
+		$section_by_key = array();
+
+		foreach ( $sections as $section ) {
+			$section_by_key[ $section->get_section_key() ] = $section;
+		}
+
+		return $section_by_key;
+	}
 }
diff --git a/tests/phpunit/integration/Core/Email_Reporting/Email_Reporting_Data_RequestsTest.php b/tests/phpunit/integration/Core/Email_Reporting/Email_Reporting_Data_RequestsTest.php
index 8cd10d88a44..40b7f5dfe85 100644
--- a/tests/phpunit/integration/Core/Email_Reporting/Email_Reporting_Data_RequestsTest.php
+++ b/tests/phpunit/integration/Core/Email_Reporting/Email_Reporting_Data_RequestsTest.php
@@ -137,6 +137,8 @@ public function test_admin_user_receives_payloads() {
 		$this->assertArrayHasKey( 'total_conversion_events', $payload[ Analytics_4::MODULE_SLUG ], 'Conversion events payload should be included.' );
 		$this->assertArrayHasKey( 'conversion_event_add_to_cart', $payload[ Analytics_4::MODULE_SLUG ], 'Add to cart conversion event payload should be included.' );
 		$this->assertArrayHasKey( 'conversion_event_purchase', $payload[ Analytics_4::MODULE_SLUG ], 'Purchase conversion event payload should be included.' );
+		$this->assertArrayHasKey( 'conversion_event_top_channel_add_to_cart', $payload[ Analytics_4::MODULE_SLUG ], 'Add to cart top channel payload should be included.' );
+		$this->assertArrayHasKey( 'conversion_event_top_channel_purchase', $payload[ Analytics_4::MODULE_SLUG ], 'Purchase top channel payload should be included.' );
 		$this->assertArrayHasKey( 'total_visitors', $payload[ Analytics_4::MODULE_SLUG ], 'Total visitors payload should be included.' );
 		$this->assertArrayHasKey( 'traffic_channels', $payload[ Analytics_4::MODULE_SLUG ], 'Traffic channels payload should be included.' );
 		$this->assertArrayHasKey( 'popular_content', $payload[ Analytics_4::MODULE_SLUG ], 'Popular content payload should be included.' );
@@ -265,6 +267,8 @@ public function test_view_only_user_with_shared_module_gets_shared_payload_only(
 		$this->assertArrayHasKey( 'total_conversion_events', $payload[ Analytics_4::MODULE_SLUG ], 'Shared viewer should see conversion events.' );
 		$this->assertArrayHasKey( 'conversion_event_add_to_cart', $payload[ Analytics_4::MODULE_SLUG ], 'Shared viewer should see add to cart conversion event data.' );
 		$this->assertArrayHasKey( 'conversion_event_purchase', $payload[ Analytics_4::MODULE_SLUG ], 'Shared viewer should see purchase conversion event data.' );
+		$this->assertArrayHasKey( 'conversion_event_top_channel_add_to_cart', $payload[ Analytics_4::MODULE_SLUG ], 'Shared viewer should see add to cart top channel data.' );
+		$this->assertArrayHasKey( 'conversion_event_top_channel_purchase', $payload[ Analytics_4::MODULE_SLUG ], 'Shared viewer should see purchase top channel data.' );
 		$this->assertArrayNotHasKey( 'new_visitors', $payload[ Analytics_4::MODULE_SLUG ], 'Audience segmentation data should be absent.' );
 		$this->assertArrayNotHasKey( 'returning_visitors', $payload[ Analytics_4::MODULE_SLUG ], 'Audience segmentation data should be absent.' );
 		$this->assertArrayNotHasKey( 'top_authors', $payload[ Analytics_4::MODULE_SLUG ], 'Custom dimension authors data should be absent.' );
diff --git a/tests/phpunit/integration/Modules/Analytics_4/Email_Reporting/Report_OptionsTest.php b/tests/phpunit/integration/Modules/Analytics_4/Email_Reporting/Report_OptionsTest.php
index 4534744719d..15a5820a647 100644
--- a/tests/phpunit/integration/Modules/Analytics_4/Email_Reporting/Report_OptionsTest.php
+++ b/tests/phpunit/integration/Modules/Analytics_4/Email_Reporting/Report_OptionsTest.php
@@ -109,15 +109,35 @@ public function test_conversion_event_options__builds_expected_request() {
 			$options['metrics'],
 			'Conversion event report should request eventCount.'
 		);
+		$this->assertSame(
+			array( 'value' => 'begin_checkout' ),
+			$options['dimensionFilters']['eventName'],
+			'Conversion event report should filter by the requested event name.'
+		);
+		$this->assertArrayNotHasKey( 'dimensions', $options, 'Conversion event report should not group by channel dimensions.' );
+		$this->assertArrayNotHasKey( 'orderby', $options, 'Conversion event report should not order by channel metric.' );
+		$this->assertArrayNotHasKey( 'limit', $options, 'Conversion event report should not limit rows by top channel.' );
+		$this->assertTrue( $options['keepEmptyRows'], 'Conversion event report should include empty rows.' );
+	}
+
+	public function test_conversion_event_top_channel_options__builds_expected_request() {
+		$builder = $this->create_builder();
+		$options = $builder->get_conversion_event_top_channel_options( 'begin_checkout' );
+
+		$this->assertSame(
+			array( array( 'name' => 'eventCount' ) ),
+			$options['metrics'],
+			'Top channel report should request eventCount.'
+		);
 		$this->assertSame(
 			array( array( 'name' => 'sessionDefaultChannelGroup' ) ),
 			$options['dimensions'],
-			'Conversion event report should group by sessionDefaultChannelGroup.'
+			'Top channel report should group by sessionDefaultChannelGroup.'
 		);
 		$this->assertSame(
 			array( 'value' => 'begin_checkout' ),
 			$options['dimensionFilters']['eventName'],
-			'Conversion event report should filter by the requested event name.'
+			'Top channel report should filter by the requested event name.'
 		);
 		$this->assertSame(
 			array(
@@ -127,10 +147,10 @@ public function test_conversion_event_options__builds_expected_request() {
 				),
 			),
 			$options['orderby'],
-			'Conversion event report should order rows by event count descending.'
+			'Top channel report should order rows by event count descending.'
 		);
-		$this->assertSame( 1, $options['limit'], 'Conversion event report should limit to one top row.' );
-		$this->assertTrue( $options['keepEmptyRows'], 'Conversion event report should include empty rows.' );
+		$this->assertSame( 1, $options['limit'], 'Top channel report should limit to one top row.' );
+		$this->assertTrue( $options['keepEmptyRows'], 'Top channel report should include empty rows.' );
 	}
 
 	public function test_top_categories_uses_custom_dimension() {