diff --git a/README.md b/README.md
index 2a112b7..1e4d7d3 100644
--- a/README.md
+++ b/README.md
@@ -450,6 +450,13 @@ api.triggerBroadcast(1, { name: "foo" }, { emails: ["example@emails.com"], email
 
 [You can learn more about the available recipient fields here](https://customer.io/docs/api/#operation/triggerBroadcast).
 
+Both `data` and `recipients` are optional. Omitting `recipients` sends the broadcast to its configured recipients. Note that the parameters are positional: to pass `recipients` without `data`, pass `undefined` for `data` — passing the recipient selector as the second argument would send it as liquid data instead.
+
+```javascript
+api.triggerBroadcast(1); // broadcast's configured recipients
+api.triggerBroadcast(1, undefined, { emails: ["example@emails.com"], email_ignore_missing: true });
+```
+
 #### Options
 
 - **id**: String or number (required)
diff --git a/lib/api.ts b/lib/api.ts
index d41c19c..9147994 100644
--- a/lib/api.ts
+++ b/lib/api.ts
@@ -221,24 +221,37 @@ export class APIClient {
    * Otherwise the entire `recipients` object is forwarded verbatim alongside
    * `data` (use this for segment-based recipients).
    *
+   * Both `data` and `recipients` are optional; omitting `recipients` sends the
+   * broadcast to its configured recipients.
+   *
+   * Note that the parameters are positional: to pass `recipients` without
+   * `data`, pass `undefined` for `data` — e.g.
+   * `triggerBroadcast(1, undefined, { emails: ['user@example.com'] })`.
+   * Passing the recipient selector as the second argument would send it as
+   * liquid `data` and trigger the broadcast's configured recipients instead.
+   *
    * @param broadcastId The broadcast (campaign) id.
    * @param data Liquid `data` payload made available to the broadcast template.
    * @param recipients Recipient selector. See above.
    * @returns The parsed JSON response body.
    */
-  triggerBroadcast(broadcastId: string | number, data: RequestData, recipients: Recipients) {
-    let payload = {};
-    let customRecipientField = (
-      Object.keys(BROADCASTS_ALLOWED_RECIPIENT_FIELDS) as BroadcastsAllowedRecipientFieldsKeys[]
-    ).find((field) => recipients[field]);
-
-    if (customRecipientField) {
-      payload = Object.assign({ data }, filterRecipientsDataForField(recipients, customRecipientField));
-    } else {
-      payload = {
-        data,
-        recipients,
-      };
+  triggerBroadcast(broadcastId: string | number, data?: RequestData, recipients?: Recipients) {
+    let payload: Record<string, unknown> = {};
+
+    if (data && Object.keys(data).length > 0) {
+      payload.data = data;
+    }
+
+    if (recipients && Object.keys(recipients).length > 0) {
+      let customRecipientField = (
+        Object.keys(BROADCASTS_ALLOWED_RECIPIENT_FIELDS) as BroadcastsAllowedRecipientFieldsKeys[]
+      ).find((field) => recipients[field]);
+
+      if (customRecipientField) {
+        payload = Object.assign(payload, filterRecipientsDataForField(recipients, customRecipientField));
+      } else {
+        payload.recipients = recipients;
+      }
     }
 
     return this.request.post(`${this.apiRoot}/campaigns/${encodeURIComponent(broadcastId)}/triggers`, payload);
diff --git a/test/api.ts b/test/api.ts
index 9127a41..8cac3e3 100644
--- a/test/api.ts
+++ b/test/api.ts
@@ -390,6 +390,39 @@ test('#triggerBroadcast discards extraneous fields', (t) => {
   );
 });
 
+test('#triggerBroadcast works with broadcastId only', (t) => {
+  sinon.stub(t.context.client.request, 'post');
+  t.context.client.triggerBroadcast(1);
+  t.truthy((t.context.client.request.post as SinonStub).calledWith(`${RegionUS.apiUrl}/campaigns/1/triggers`, {}));
+});
+
+test('#triggerBroadcast works with data and no recipients', (t) => {
+  sinon.stub(t.context.client.request, 'post');
+  t.context.client.triggerBroadcast(1, { type: 'data' });
+  t.truthy(
+    (t.context.client.request.post as SinonStub).calledWith(`${RegionUS.apiUrl}/campaigns/1/triggers`, {
+      data: { type: 'data' },
+    }),
+  );
+});
+
+test('#triggerBroadcast works with recipients and no data', (t) => {
+  sinon.stub(t.context.client.request, 'post');
+  t.context.client.triggerBroadcast(1, undefined, { emails: ['test@email.com'], email_ignore_missing: true });
+  t.truthy(
+    (t.context.client.request.post as SinonStub).calledWith(`${RegionUS.apiUrl}/campaigns/1/triggers`, {
+      emails: ['test@email.com'],
+      email_ignore_missing: true,
+    }),
+  );
+});
+
+test('#triggerBroadcast omits empty data and recipients objects', (t) => {
+  sinon.stub(t.context.client.request, 'post');
+  t.context.client.triggerBroadcast(1, {}, {});
+  t.truthy((t.context.client.request.post as SinonStub).calledWith(`${RegionUS.apiUrl}/campaigns/1/triggers`, {}));
+});
+
 test('#listExports: success', (t) => {
   sinon.stub(t.context.client.request, 'get');
   t.context.client.listExports();