diff --git a/CHANGELOG.md b/CHANGELOG.md
index bd5aeb6..00c9468 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## Unreleased
 
+## 0.5.0 — 2026-08-21
+
+- Added `performanceGroups()`, the trusted server resource for fixed two-to-eight
+  performance runs. It creates and activates groups, mints one-time browser
+  access, retrieves authoritative group holds, and confirms bookings with
+  stable action and order references. Browser-only group routes remain outside
+  this secret-key SDK.
+
 - **Security/reliability:** Mutations now default to a single attempt. Automatic header-replay
   retries are limited to chart create/copy, template instantiation, event create, and workspace
   create, preventing transient failures from duplicating holds or best-available results and from
diff --git a/README.md b/README.md
index a431026..687a3f4 100644
--- a/README.md
+++ b/README.md
@@ -16,12 +16,12 @@ Official Java server SDK for the [SeatLayer](https://seatlayer.io) reserved-seat
 <dependency>
   <groupId>io.seatlayer</groupId>
   <artifactId>seatlayer-java</artifactId>
-  <version>0.4.0</version>
+  <version>0.5.0</version>
 </dependency>
 ```
 
 ```groovy
-implementation 'io.seatlayer:seatlayer-java:0.4.0'
+implementation 'io.seatlayer:seatlayer-java:0.5.0'
 ```
 
 Requires Java 17 or newer. **Zero runtime dependencies** — the SDK uses
diff --git a/pom.xml b/pom.xml
index d7f6387..bac198d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>io.seatlayer</groupId>
   <artifactId>seatlayer-java</artifactId>
-  <version>0.4.0</version>
+  <version>0.5.0</version>
   <packaging>jar</packaging>
 
   <name>SeatLayer Java SDK</name>
diff --git a/src/main/java/io/seatlayer/PerformanceGroups.java b/src/main/java/io/seatlayer/PerformanceGroups.java
new file mode 100644
index 0000000..5b2beb9
--- /dev/null
+++ b/src/main/java/io/seatlayer/PerformanceGroups.java
@@ -0,0 +1,136 @@
+package io.seatlayer;
+
+import static io.seatlayer.SeatLayerHttpClient.body;
+import static io.seatlayer.SeatLayerHttpClient.encode;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Fixed multi-performance runs, trusted hold inspection, and host-authorized booking.
+ *
+ * <p>This is a secret-key resource. Pass only the one-time token returned from
+ * {@link #createBuyerAccessSession(String, String, boolean)} to PerformanceGroupPicker in a browser.
+ */
+public final class PerformanceGroups {
+
+    private final SeatLayerHttpClient http;
+
+    PerformanceGroups(SeatLayerHttpClient http) {
+        this.http = http;
+    }
+
+    private static String path(String performanceGroupKey, String suffix) {
+        return "/v1/performance-groups/" + encode(performanceGroupKey) + suffix;
+    }
+
+    public Map<String, Object> list() {
+        return http.get("/v1/performance-groups");
+    }
+
+    public Map<String, Object> list(
+            String workspaceId, String externalRef, String state, Integer limit, String cursor) {
+        return http.get(
+                "/v1/performance-groups",
+                body(
+                        "workspaceId", workspaceId,
+                        "externalRef", externalRef,
+                        "state", state,
+                        "limit", limit,
+                        "cursor", cursor));
+    }
+
+    /** Create a draft run with exact idempotency replay. */
+    public Map<String, Object> create(String name, List<String> eventKeys) {
+        return create(name, eventKeys, null, null);
+    }
+
+    public Map<String, Object> create(
+            String name, List<String> eventKeys, String externalRef, String idempotencyKey) {
+        return http.postWithHeaderReplay(
+                "/v1/performance-groups",
+                body("name", name, "eventKeys", eventKeys, "externalRef", externalRef),
+                idempotencyKey);
+    }
+
+    public Map<String, Object> retrieve(String performanceGroupKey) {
+        return http.get(path(performanceGroupKey, ""));
+    }
+
+    /** Delete a draft only; activated runs remain available for audit. */
+    public void delete(String performanceGroupKey) {
+        http.delete(path(performanceGroupKey, ""));
+    }
+
+    /** Start activation. Poll retrieveLifecycle when the returned operation is not terminal. */
+    public Map<String, Object> activate(String performanceGroupKey, int expectedRevision) {
+        return http.post(path(performanceGroupKey, "/activate"), body("expectedRevision", expectedRevision));
+    }
+
+    /** Stop new group sales. Poll retrieveLifecycle until the close becomes terminal. */
+    public Map<String, Object> close(String performanceGroupKey, int expectedRevision) {
+        return http.post(path(performanceGroupKey, "/close"), body("expectedRevision", expectedRevision));
+    }
+
+    public Map<String, Object> retrieveLifecycle(String performanceGroupKey, String operationId) {
+        return http.get(path(performanceGroupKey, "/lifecycle/" + encode(operationId)));
+    }
+
+    /**
+     * Reveal one origin-bound browser bearer. This call is deliberately single-attempt.
+     */
+    public Map<String, Object> createBuyerAccessSession(
+            String performanceGroupKey, String allowedOrigin, boolean includePublic) {
+        return createBuyerAccessSession(
+                performanceGroupKey, allowedOrigin, includePublic, null, null, null, null, null);
+    }
+
+    public Map<String, Object> createBuyerAccessSession(
+            String performanceGroupKey,
+            String allowedOrigin,
+            boolean includePublic,
+            Map<String, List<String>> channelIdsByEvent,
+            Integer expiresInSeconds,
+            Integer maxQuantity,
+            String buyerRef,
+            String partnerRef) {
+        return http.post(
+                path(performanceGroupKey, "/buyer-access-sessions"),
+                body(
+                        "allowedOrigin", allowedOrigin,
+                        "includePublic", includePublic,
+                        "channelIdsByEvent", channelIdsByEvent,
+                        "expiresInSeconds", expiresInSeconds,
+                        "maxQuantity", maxQuantity,
+                        "buyerRef", buyerRef,
+                        "partnerRef", partnerRef));
+    }
+
+    public Map<String, Object> listBuyerAccessSessions(String performanceGroupKey) {
+        return listBuyerAccessSessions(performanceGroupKey, null);
+    }
+
+    public Map<String, Object> listBuyerAccessSessions(String performanceGroupKey, Integer limit) {
+        return http.get(path(performanceGroupKey, "/buyer-access-sessions"), body("limit", limit));
+    }
+
+    public Map<String, Object> revokeBuyerAccessSession(String performanceGroupKey, String sessionId) {
+        return http.delete(path(performanceGroupKey, "/buyer-access-sessions/" + encode(sessionId)));
+    }
+
+    public Map<String, Object> retrieveHold(String performanceGroupKey, String operationId) {
+        return http.get(path(performanceGroupKey, "/holds/" + encode(operationId)));
+    }
+
+    /** Reuse both stable IDs and poll retrieveBooking while the returned booking is pending. */
+    public Map<String, Object> bookHold(
+            String performanceGroupKey, String operationId, String bookActionId, String bookingRef) {
+        return http.post(
+                path(performanceGroupKey, "/holds/" + encode(operationId) + "/book"),
+                body("bookActionId", bookActionId, "bookingRef", bookingRef));
+    }
+
+    public Map<String, Object> retrieveBooking(String performanceGroupKey, String actionId) {
+        return http.get(path(performanceGroupKey, "/bookings/" + encode(actionId)));
+    }
+}
diff --git a/src/main/java/io/seatlayer/SeatLayer.java b/src/main/java/io/seatlayer/SeatLayer.java
index 29ba74e..7d733b0 100644
--- a/src/main/java/io/seatlayer/SeatLayer.java
+++ b/src/main/java/io/seatlayer/SeatLayer.java
@@ -21,6 +21,7 @@ public final class SeatLayer {
     private final Channels channels;
     private final Events events;
     private final Inventory inventory;
+    private final PerformanceGroups performanceGroups;
     private final Sessions sessions;
     private final Templates templates;
     private final Webhooks webhooks;
@@ -37,6 +38,7 @@ private SeatLayer(Builder builder) {
         this.channels = new Channels(http);
         this.events = new Events(http);
         this.inventory = new Inventory(http);
+        this.performanceGroups = new PerformanceGroups(http);
         this.sessions = new Sessions(http);
         this.templates = new Templates(http);
         this.webhooks = new Webhooks(http);
@@ -64,6 +66,11 @@ public Inventory inventory() {
         return inventory;
     }
 
+    /** Fixed multi-performance lifecycle and host-side booking coordination. */
+    public PerformanceGroups performanceGroups() {
+        return performanceGroups;
+    }
+
     public Sessions sessions() {
         return sessions;
     }
diff --git a/src/test/java/io/seatlayer/ClientTest.java b/src/test/java/io/seatlayer/ClientTest.java
index da26cb7..90090fc 100644
--- a/src/test/java/io/seatlayer/ClientTest.java
+++ b/src/test/java/io/seatlayer/ClientTest.java
@@ -180,6 +180,57 @@ void dropsNullQueryParameters() {
             sdk.charts().list(ChartListOptions.builder().workspaceId("ws_1").build());
             assertEquals("https://api.seatlayer.io/v1/charts?workspaceId=ws_1", call(0).url());
         }
+
+        @Test
+        @DisplayName("maps the full Performance Groups lifecycle")
+        void performanceGroupLifecycle() {
+            SeatLayer sdk = client(List.of(
+                    Stub.of(200, "{\"performanceGroups\":[]}"),
+                    Stub.of(201, "{\"performanceGroup\":{}}"),
+                    Stub.of(200, "{\"performanceGroup\":{}}"),
+                    Stub.of(204, ""),
+                    Stub.of(202, "{\"lifecycleOperation\":{\"terminal\":false}}"),
+                    Stub.of(200, "{\"lifecycleOperation\":{\"terminal\":true}}"),
+                    Stub.of(200, "{\"lifecycleOperation\":{}}"),
+                    Stub.of(201, "{\"token\":\"bsg_secret\"}"),
+                    Stub.of(200, "{\"sessions\":[]}"),
+                    Stub.of(200, "{\"ok\":true}"),
+                    Stub.of(200, "{\"hold\":{}}"),
+                    Stub.of(202, "{\"booking\":{\"state\":\"book_pending\"}}"),
+                    Stub.of(200, "{\"booking\":{\"state\":\"booked\"}}")));
+            String groupKey = "pg_a/b";
+
+            sdk.performanceGroups().list("ws_1", null, "draft", null, null);
+            sdk.performanceGroups().create("Weekend run", List.of("ev_1", "ev_2"), null, "weekend-run-1");
+            sdk.performanceGroups().retrieve(groupKey);
+            sdk.performanceGroups().delete(groupKey);
+            sdk.performanceGroups().activate(groupKey, 1);
+            sdk.performanceGroups().close(groupKey, 2);
+            sdk.performanceGroups().retrieveLifecycle(groupKey, "pga_1");
+            sdk.performanceGroups().createBuyerAccessSession(groupKey, "https://tickets.example.test", true);
+            sdk.performanceGroups().listBuyerAccessSessions(groupKey, 25);
+            sdk.performanceGroups().revokeBuyerAccessSession(groupKey, "pgbs_1");
+            sdk.performanceGroups().retrieveHold(groupKey, "pgh_1");
+            sdk.performanceGroups().bookHold(groupKey, "pgh_1", "book_1", "order_1");
+            sdk.performanceGroups().retrieveBooking(groupKey, "book_1");
+
+            String base = "https://api.seatlayer.io/v1/performance-groups/pg_a%2Fb";
+            assertEquals("https://api.seatlayer.io/v1/performance-groups?workspaceId=ws_1&state=draft", call(0).url());
+            assertEquals("weekend-run-1", call(1).headers().get("Idempotency-Key"));
+            assertEquals(base, call(2).url());
+            assertEquals("DELETE", call(3).method());
+            assertEquals(base + "/activate", call(4).url());
+            assertEquals(base + "/close", call(5).url());
+            assertEquals(base + "/lifecycle/pga_1", call(6).url());
+            assertEquals(base + "/buyer-access-sessions", call(7).url());
+            assertNull(call(7).headers().get("Idempotency-Key"));
+            assertEquals(base + "/buyer-access-sessions?limit=25", call(8).url());
+            assertEquals(base + "/buyer-access-sessions/pgbs_1", call(9).url());
+            assertEquals(base + "/holds/pgh_1", call(10).url());
+            assertEquals(base + "/holds/pgh_1/book", call(11).url());
+            assertNull(call(11).headers().get("Idempotency-Key"));
+            assertEquals(base + "/bookings/book_1", call(12).url());
+        }
     }
 
     @Nested