diff --git a/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateSiteApi.kt b/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateSiteApi.kt
index c8ba106fd..8745782d4 100644
--- a/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateSiteApi.kt
+++ b/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateSiteApi.kt
@@ -75,6 +75,23 @@ interface GateSiteApi {
     @GetExchange("/input/sites/{externalId}")
     fun getSiteByExternalId(@Parameter(description = "External identifier") @PathVariable externalId: String): SiteGateInputResponse
 
+    @Operation(
+        summary = "Get page of sites filtered by a collection of externalIds",
+        description = "Get page of sites filtered by a collection of externalIds."
+    )
+    @ApiResponses(
+        value = [
+            ApiResponse(responseCode = "200", description = "The requested page of sites"),
+            ApiResponse(responseCode = "400", description = "On malformed pagination request", content = [Content()]),
+        ]
+    )
+    @PostMapping("/input/sites/search")
+    @PostExchange("/input/sites/search")
+    fun getSitesByExternalIds(
+        @ParameterObject @Valid paginationRequest: PaginationStartAfterRequest,
+        @RequestBody externalIds: Collection<String>
+    ): PageStartAfterResponse<SiteGateInputResponse>
+
     @Operation(
         summary = "Get page of sites",
         description = "Get page of sites."
diff --git a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteController.kt b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteController.kt
index a30d6cda7..ca6b151c3 100644
--- a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteController.kt
+++ b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteController.kt
@@ -54,6 +54,13 @@ class SiteController(
         return siteService.getSiteByExternalId(externalId)
     }
 
+    override fun getSitesByExternalIds(
+        paginationRequest: PaginationStartAfterRequest,
+        externalIds: Collection<String>
+    ): PageStartAfterResponse<SiteGateInputResponse> {
+        return siteService.getSites(paginationRequest.limit, paginationRequest.startAfter, externalIds)
+    }
+
     override fun getSites(paginationRequest: PaginationStartAfterRequest): PageStartAfterResponse<SiteGateInputResponse> {
         return siteService.getSites(paginationRequest.limit, paginationRequest.startAfter)
     }
diff --git a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/SiteService.kt b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/SiteService.kt
index 083992322..11b5c9bbb 100644
--- a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/SiteService.kt
+++ b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/SiteService.kt
@@ -51,8 +51,8 @@ class SiteService(
 ) {
     private val logger = KotlinLogging.logger { }
 
-    fun getSites(limit: Int, startAfter: String?): PageStartAfterResponse<SiteGateInputResponse> {
-        val sitesPage = saasClient.getSites(limit, startAfter)
+    fun getSites(limit: Int, startAfter: String?, externalIds: Collection<String>? = null): PageStartAfterResponse<SiteGateInputResponse> {
+        val sitesPage = saasClient.getSites(limit, startAfter, externalIds)
 
         val validEntries = sitesPage.values.filter { validateSiteBusinessPartner(it) }
 
diff --git a/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteControllerInputIT.kt b/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteControllerInputIT.kt
index d4d5a7104..0c9c759c7 100644
--- a/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteControllerInputIT.kt
+++ b/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/SiteControllerInputIT.kt
@@ -242,6 +242,62 @@ internal class SiteControllerInputIT @Autowired constructor(
         )
     }
 
+    /**
+     * Given sites exists in SaaS
+     * When getting sites page based on externalId
+     * Then sites page mapped to the catena data model should be returned
+     */
+    @Test
+    fun `get sites by external id`() {
+        val sitesSaas = listOf(
+            SaasValues.siteBusinessPartnerWithRelations1,
+            SaasValues.siteBusinessPartnerWithRelations2
+        )
+
+        val expectedSites = listOf(
+            ResponseValues.siteGateInputResponse1,
+            ResponseValues.siteGateInputResponse2
+        )
+
+        val limit = 2
+        val startAfter = "Aaa111"
+        val nextStartAfter = "Aaa222"
+        val total = 10
+        val invalidEntries = 0
+
+        wireMockServer.stubFor(
+            get(urlPathMatching(SAAS_MOCK_BUSINESS_PARTNER_PATH))
+                .willReturn(
+                    aResponse()
+                        .withHeader("Content-Type", "application/json")
+                        .withBody(
+                            objectMapper.writeValueAsString(
+                                PagedResponseSaas(
+                                    limit = limit,
+                                    startAfter = startAfter,
+                                    nextStartAfter = nextStartAfter,
+                                    total = total,
+                                    values = sitesSaas
+                                )
+                            )
+                        )
+                )
+        )
+
+        val externalIds = sitesSaas.mapNotNull { it.externalId }
+        val paginationValue = PaginationStartAfterRequest(startAfter, limit)
+        val pageResponse = gateClient.sites().getSitesByExternalIds(paginationValue, externalIds)
+
+        assertThat(pageResponse).isEqualTo(
+            PageStartAfterResponse(
+                total = total,
+                nextStartAfter = nextStartAfter,
+                content = expectedSites,
+                invalidEntries = invalidEntries
+            )
+        )
+    }
+
     /**
      * Given invalid sites in SaaS
      * When getting sites page