diff --git a/build/platform.simulator.macos.mak b/build/platform.simulator.macos.mak
index dcfeac04b..927d80636 100644
--- a/build/platform.simulator.macos.mak
+++ b/build/platform.simulator.macos.mak
@@ -5,7 +5,9 @@ APPLE_PLATFORM = macos
 APPLE_PLATFORM_MIN_VERSION = 10.10
 EPSILON_TELEMETRY ?= 0
 
-ARCHS = x86_64
+# Build universal binary for both x86_64 and ARM64 by default
+# Can be overridden with ARCHS=arm64 or ARCHS=x86_64 for single architecture builds
+ARCHS ?= x86_64 arm64
 
 ifdef ARCH
 BUILD_DIR := $(BUILD_DIR)/$(ARCH)
diff --git a/ion/src/simulator/macos/Makefile b/ion/src/simulator/macos/Makefile
index cdc8015d6..724a4b8af 100644
--- a/ion/src/simulator/macos/Makefile
+++ b/ion/src/simulator/macos/Makefile
@@ -11,13 +11,30 @@ ion_src += $(addprefix ion/src/simulator/shared/, \
   dummy/keyboard_callback.cpp \
   dummy/window_callback.cpp \
   clipboard_helper.cpp \
-  collect_registers_x86_64.s \
   collect_registers.cpp \
   haptics.cpp \
   journal.cpp \
   store_script.cpp \
 )
 
+# Include architecture-specific assembly files
+# When building for a specific architecture (via ARCH variable)
+ifdef ARCH
+ifeq ($(ARCH),arm64)
+ion_src += ion/src/simulator/shared/collect_registers_arm64.s
+else
+ion_src += ion/src/simulator/shared/collect_registers_x86_64.s
+endif
+else
+# When building universal binary, include both
+ifneq ($(filter arm64,$(ARCHS)),)
+ion_src += ion/src/simulator/shared/collect_registers_arm64.s
+endif
+ifneq ($(filter x86_64,$(ARCHS)),)
+ion_src += ion/src/simulator/shared/collect_registers_x86_64.s
+endif
+endif
+
 ifeq ($(EPSILON_TELEMETRY),1)
 ion_src += ion/src/simulator/shared/dummy/telemetry_init.cpp
 ion_src += ion/src/shared/telemetry_console.cpp
diff --git a/ion/src/simulator/shared/collect_registers_arm64.s b/ion/src/simulator/shared/collect_registers_arm64.s
new file mode 100644
index 000000000..67b4e5b0b
--- /dev/null
+++ b/ion/src/simulator/shared/collect_registers_arm64.s
@@ -0,0 +1,21 @@
+.text
+
+.global _collect_registers
+
+_collect_registers:
+        // Save callee-saved registers to the buffer pointed by x0
+        // ARM64 callee-saved registers: x19-x28, x29 (fp), x30 (lr), sp
+        stp     x19, x20, [x0, #0]
+        stp     x21, x22, [x0, #16]
+        stp     x23, x24, [x0, #32]
+        stp     x25, x26, [x0, #48]
+        stp     x27, x28, [x0, #64]
+        stp     x29, x30, [x0, #80]
+
+        // Save stack pointer
+        mov     x1, sp
+        str     x1, [x0, #96]
+
+        // Return current stack pointer
+        mov     x0, sp
+        ret
\ No newline at end of file