diff --git a/services/web/app/src/Features/Project/ProjectListController.mjs b/services/web/app/src/Features/Project/ProjectListController.mjs
index 27cff0343a..8b8150c21d 100644
--- a/services/web/app/src/Features/Project/ProjectListController.mjs
+++ b/services/web/app/src/Features/Project/ProjectListController.mjs
@@ -536,6 +536,7 @@ async function projectListPage(req, res, next) {
     aiBlocked,
     hasAiAssist,
     lastActive: user.lastActive,
+    signUpDate: user.signUpDate,
   })
 }
 
diff --git a/services/web/app/views/_customer_io.pug b/services/web/app/views/_customer_io.pug
index 0404fd3259..91c92d7836 100644
--- a/services/web/app/views/_customer_io.pug
+++ b/services/web/app/views/_customer_io.pug
@@ -3,7 +3,7 @@ if(customerIoEnabled && ExposedSettings.cioWriteKey && ExposedSettings.cioSiteId
 		function boolAttr(value) {
 			return value !== undefined ? String(value) : null;
 		}
-	script(type="text/javascript", id="cio-loader", nonce=scriptNonce, data-best-subscription=(usersBestSubscription && usersBestSubscription.type), data-ai-blocked=boolAttr(aiBlocked), data-has-ai-assist=boolAttr(hasAiAssist), data-cio-write-key=ExposedSettings.cioWriteKey, data-cio-site-id=ExposedSettings.cioSiteId, data-session-analytics-id=getSessionAnalyticsId(), data-user-id=getLoggedInUserId(), data-last-active=lastActive).
+	script(type="text/javascript", id="cio-loader", nonce=scriptNonce, data-best-subscription=(usersBestSubscription && usersBestSubscription.type), data-ai-blocked=boolAttr(aiBlocked), data-has-ai-assist=boolAttr(hasAiAssist), data-cio-write-key=ExposedSettings.cioWriteKey, data-cio-site-id=ExposedSettings.cioSiteId, data-session-analytics-id=getSessionAnalyticsId(), data-user-id=getLoggedInUserId(), data-last-active=lastActive, data-sign-up-date=signUpDate).
 		
 		function parseBool(value) {
 			return value === 'true' ? true : value === 'false' ? false : undefined;
@@ -18,6 +18,7 @@ if(customerIoEnabled && ExposedSettings.cioWriteKey && ExposedSettings.cioSiteId
 		var aiBlocked = parseBool(cioSettings.aiBlocked);
 		var hasAiAssist = parseBool(cioSettings.hasAiAssist);
 		var lastActive = cioSettings.lastActive;
+		var signUpDate = cioSettings.signUpDate;
 
 
 		!function(){var i="cioanalytics", analytics=(window[i]=window[i]||[]);if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","debug","page","once","off","on","addSourceMiddleware","addIntegrationMiddleware","setAnonymousId","addDestinationMiddleware"];analytics.factory=function(e){return function(){var t=Array.prototype.slice.call(arguments);t.unshift(e);analytics.push(t);return analytics}};for(var e=0;e<analytics.methods.length;e++){var key=analytics.methods[e];analytics[key]=analytics.factory(key)}analytics.load=function(key,e){var t=document.createElement("script");t.type="text/javascript";t.async=!0;t.setAttribute('data-global-customerio-analytics-key', i);t.src="https://cdp.customer.io/v1/analytics-js/snippet/" + key + "/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(t,n);analytics._writeKey=key;analytics._loadOptions=e};analytics.SNIPPET_VERSION="4.15.3";
@@ -40,7 +41,7 @@ if(customerIoEnabled && ExposedSettings.cioWriteKey && ExposedSettings.cioSiteId
 				if (typeof value !== 'undefined') obj[key] = value;
 			}
 			
-			var identifyData = {overleafId: userId, lastActive};
+			var identifyData = {overleafId: userId, lastActive, signUpDate};
 			addIfDefined(identifyData, 'best-subscription-type', usersBestSubscription);
 			addIfDefined(identifyData, 'aiBlocked', aiBlocked);
 			addIfDefined(identifyData, 'hasAiAssist', hasAiAssist);
diff --git a/services/web/test/unit/src/Project/ProjectListController.test.mjs b/services/web/test/unit/src/Project/ProjectListController.test.mjs
index 28bb6b67ec..1016cf37e5 100644
--- a/services/web/test/unit/src/Project/ProjectListController.test.mjs
+++ b/services/web/test/unit/src/Project/ProjectListController.test.mjs
@@ -20,7 +20,8 @@ describe('ProjectListController', function () {
       first_name: 'bjkdsjfk',
       features: {},
       emails: [{ email: 'test@overleaf.com' }],
-      lastActive: new Date(1),
+      lastActive: new Date(2),
+      signUpDate: new Date(1),
       lastLoginIp: '111.111.111.112',
     }
     ctx.users = {