diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d2c8bfdb..f9354c3ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -171,6 +171,7 @@ add_library(
   src/cpp/jank/runtime/obj/persistent_array_map.cpp
   src/cpp/jank/runtime/obj/persistent_hash_map.cpp
   src/cpp/jank/runtime/obj/transient_hash_map.cpp
+  src/cpp/jank/runtime/obj/transient_vector.cpp
   src/cpp/jank/runtime/obj/persistent_set.cpp
   src/cpp/jank/runtime/obj/persistent_string.cpp
   src/cpp/jank/runtime/obj/cons.cpp
diff --git a/include/cpp/jank/runtime/obj/persistent_vector.hpp b/include/cpp/jank/runtime/obj/persistent_vector.hpp
index 7557c0a24..d49d3126d 100644
--- a/include/cpp/jank/runtime/obj/persistent_vector.hpp
+++ b/include/cpp/jank/runtime/obj/persistent_vector.hpp
@@ -7,9 +7,6 @@ namespace jank::runtime
 {
   namespace obj
   {
-    using persistent_vector = static_object<object_type::persistent_vector>;
-    using persistent_vector_ptr = native_box<persistent_vector>;
-
     using transient_vector = static_object<object_type::transient_vector>;
     using transient_vector_ptr = native_box<transient_vector>;
   }
@@ -69,4 +66,10 @@ namespace jank::runtime
     option<object_ptr> meta;
     mutable native_hash hash{};
   };
+
+  namespace obj
+  {
+    using persistent_vector = static_object<object_type::persistent_vector>;
+    using persistent_vector_ptr = native_box<persistent_vector>;
+  }
 }
diff --git a/include/cpp/jank/runtime/obj/transient_vector.hpp b/include/cpp/jank/runtime/obj/transient_vector.hpp
index 33e318458..0b0f32d57 100644
--- a/include/cpp/jank/runtime/obj/transient_vector.hpp
+++ b/include/cpp/jank/runtime/obj/transient_vector.hpp
@@ -42,7 +42,12 @@ namespace jank::runtime
 
     /* behavior::callable */
     object_ptr call(object_ptr) const;
-    object_ptr call(object_ptr, object_ptr) const;
+
+    /* behavior::associatively_readable */
+    object_ptr get(object_ptr idx) const;
+    object_ptr get(object_ptr idx, object_ptr fallback) const;
+    object_ptr get_entry(object_ptr key) const;
+    native_bool contains(object_ptr key) const;
 
     void assert_active() const;
 
diff --git a/src/cpp/jank/evaluate.cpp b/src/cpp/jank/evaluate.cpp
index 7548436dd..36f4a1652 100644
--- a/src/cpp/jank/evaluate.cpp
+++ b/src/cpp/jank/evaluate.cpp
@@ -244,7 +244,8 @@ namespace jank::evaluate
               }
           }
         }
-        else if constexpr(std::same_as<T, runtime::obj::persistent_set>)
+        else if constexpr(std::same_as<T, runtime::obj::persistent_set>
+                          || std::same_as<T, runtime::obj::transient_vector>)
         {
           auto const s(expr.arg_exprs.size());
           if(s != 1)
diff --git a/src/cpp/jank/runtime/behavior/callable.cpp b/src/cpp/jank/runtime/behavior/callable.cpp
index 168d049c0..6be50d3d2 100644
--- a/src/cpp/jank/runtime/behavior/callable.cpp
+++ b/src/cpp/jank/runtime/behavior/callable.cpp
@@ -1,3 +1,4 @@
+#include "jank/runtime/obj/persistent_vector.hpp"
 #include <iostream>
 
 #include <fmt/core.h>
@@ -69,6 +70,7 @@ namespace jank::runtime
         else if constexpr(std::same_as<T, obj::persistent_set>
                           || std::same_as<T, obj::persistent_hash_map>
                           || std::same_as<T, obj::persistent_array_map>
+                          || std::same_as<T, obj::transient_vector>
                           || std::same_as<T, obj::keyword>)
         {
           return typed_source->call(a1);
diff --git a/src/cpp/jank/runtime/obj/transient_vector.cpp b/src/cpp/jank/runtime/obj/transient_vector.cpp
index dd2f74817..86650703f 100644
--- a/src/cpp/jank/runtime/obj/transient_vector.cpp
+++ b/src/cpp/jank/runtime/obj/transient_vector.cpp
@@ -1,10 +1,10 @@
-#include "jank/runtime/detail/object_util.hpp"
-#include "jank/runtime/erasure.hpp"
-#include "jank/type.hpp"
+#include <jank/runtime/detail/object_util.hpp>
+#include <jank/runtime/erasure.hpp>
+#include <jank/runtime/obj/persistent_vector_sequence.hpp>
 #include <jank/runtime/util.hpp>
 #include <jank/runtime/obj/native_function_wrapper.hpp>
 #include <jank/runtime/obj/transient_vector.hpp>
-#include <stdexcept>
+#include <jank/type.hpp>
 
 namespace jank::runtime
 {
@@ -65,46 +65,100 @@ namespace jank::runtime
   {
     assert_active();
     active = false;
-    return make_box<obj::persistent_vector>(std::move(data));
+    return make_box<obj::persistent_vector>(data.persistent());
   }
 
-  object_ptr obj::transient_vector::call(object_ptr const o) const
+  object_ptr obj::transient_vector::call(object_ptr const idx) const
   {
     assert_active();
-    if(o->type == object_type::integer)
+    if(idx->type == object_type::integer)
     {
-      auto const i(expect_object<obj::integer>(o)->data);
+      auto const i(expect_object<obj::integer>(idx)->data);
+      if(i < 0 || data.size() <= static_cast<size_t>(i))
+      {
+        throw std::runtime_error{
+          fmt::format("Index out of bound; index = {}, count = {}", i, count())
+        };
+      }
+
+      return data[i];
+    }
+    else
+    {
+      throw std::runtime_error{ fmt::format("key must be an integer; found {}",
+                                            runtime::detail::to_string(idx)) };
+    }
+  }
+
+  object_ptr obj::transient_vector::get(object_ptr idx) const
+  {
+    assert_active();
+    if(idx->type == object_type::integer)
+    {
+      auto const i(expect_object<obj::integer>(idx)->data);
       if(i < 0 || data.size() <= static_cast<size_t>(i))
       {
         return obj::nil::nil_const();
       }
 
-      return data.at(i);
+      return data[i];
     }
     else
     {
       throw std::runtime_error{ fmt::format("key must be an integer; found {}",
-                                            runtime::detail::to_string(o)) };
+                                            runtime::detail::to_string(idx)) };
     }
   }
 
-  object_ptr obj::transient_vector::call(object_ptr const o, object_ptr const fallback) const
+  object_ptr obj::transient_vector::get(object_ptr idx, object_ptr fallback) const
   {
     assert_active();
-    if(o->type == object_type::integer)
+    if(idx->type == object_type::integer)
     {
-      auto const i(expect_object<obj::integer>(o)->data);
+      auto const i(expect_object<obj::integer>(idx)->data);
       if(i < 0 || data.size() <= static_cast<size_t>(i))
       {
         return fallback;
       }
 
-      return data.at(i);
+      return data[i];
     }
     else
     {
       throw std::runtime_error{ fmt::format("key must be an integer; found {}",
-                                            runtime::detail::to_string(o)) };
+                                            runtime::detail::to_string(idx)) };
+    }
+  }
+
+  object_ptr obj::transient_vector::get_entry(object_ptr const key) const
+  {
+    if(key->type == object_type::integer)
+    {
+      auto const i(expect_object<obj::integer>(key)->data);
+      if(i < 0 || data.size() <= static_cast<size_t>(i))
+      {
+        return obj::nil::nil_const();
+      }
+      /* TODO: Map entry type? */
+      return make_box<obj::persistent_vector>(key, data[i]);
+    }
+    else
+    {
+      throw std::runtime_error{ fmt::format("get_entry on a vector must be an integer; found {}",
+                                            runtime::detail::to_string(key)) };
+    }
+  }
+
+  native_bool obj::transient_vector::contains(object_ptr const key) const
+  {
+    if(key->type == object_type::integer)
+    {
+      auto const i(expect_object<obj::integer>(key)->data);
+      return i >= 0 && static_cast<size_t>(i) < data.size();
+    }
+    else
+    {
+      return false;
     }
   }