diff --git a/gas/testsuite/gas/aarch64/occmo.d b/gas/testsuite/gas/aarch64/occmo.d
new file mode 100644
index 0000000..388d8f4
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/occmo.d
@@ -0,0 +1,18 @@
+#name: FEAT_OCCMO Test
+#as: -march=armv9.5-a+memtag
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section .text:
+
+0+ <.*>:
+
+[^:]*:	d50b7b00 	dc	cvaoc, x0
+[^:]*:	d50b7b1e 	dc	cvaoc, x30
+[^:]*:	d50b7be0 	dc	cgdvaoc, x0
+[^:]*:	d50b7bfe 	dc	cgdvaoc, x30
+[^:]*:	d50b7f00 	dc	civaoc, x0
+[^:]*:	d50b7f1e 	dc	civaoc, x30
+[^:]*:	d50b7fe0 	dc	cigdvaoc, x0
+[^:]*:	d50b7ffe 	dc	cigdvaoc, x30
diff --git a/gas/testsuite/gas/aarch64/occmo.s b/gas/testsuite/gas/aarch64/occmo.s
new file mode 100644
index 0000000..92cfaf0
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/occmo.s
@@ -0,0 +1,8 @@
+	dc	cvaoc, x0
+	dc	cvaoc, x30
+	dc	cgdvaoc, x0
+	dc	cgdvaoc, x30
+	dc	civaoc, x0
+	dc	civaoc, x30
+	dc	cigdvaoc, x0
+	dc	cigdvaoc, x30
diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index 3a52251..3bb93a9 100644
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -5214,6 +5214,8 @@
     { "cvac",       CPENS (3, C7, C10, 1), F_HASXT, AARCH64_NO_FEATURES },
     { "cgvac",      CPENS (3, C7, C10, 3), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
     { "cgdvac",     CPENS (3, C7, C10, 5), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
+    { "cvaoc",      CPENS (3, C7, C11, 0), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (V9_5A) },
+    { "cgdvaoc",    CPENS (3, C7, C11, 7), F_HASXT | F_ARCHEXT, AARCH64_FEATURES (2, V9_5A, MEMTAG) },
     { "csw",	    CPENS (0, C7, C10, 2), F_HASXT, AARCH64_NO_FEATURES },
     { "cgsw",       CPENS (0, C7, C10, 4), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
     { "cgdsw",	    CPENS (0, C7, C10, 6), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
@@ -5230,6 +5232,8 @@
     { "cisw",       CPENS (0, C7, C14, 2), F_HASXT, AARCH64_NO_FEATURES },
     { "cigsw",      CPENS (0, C7, C14, 4), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
     { "cigdsw",     CPENS (0, C7, C14, 6), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (MEMTAG) },
+    { "civaoc",     CPENS (3, C7, C15, 0), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (V9_5A) },
+    { "cigdvaoc",   CPENS (3, C7, C15, 7), F_HASXT | F_ARCHEXT, AARCH64_FEATURES (2, V9_5A, MEMTAG) },
     { "cipae",      CPENS (4, C7, C14, 0), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (V8_7A) },
     { "cigdpae",    CPENS (4, C7, C14, 7), F_HASXT | F_ARCHEXT, AARCH64_FEATURE (V8_7A) },
     { "cipapa",     CPENS (6, C7, C14, 1), F_HASXT, AARCH64_NO_FEATURES },