diff --git a/processor/src/chiplets/aux_trace/bus/memory.rs b/processor/src/chiplets/aux_trace/bus/memory.rs
index 9c0b7759a..b95ebb166 100644
--- a/processor/src/chiplets/aux_trace/bus/memory.rs
+++ b/processor/src/chiplets/aux_trace/bus/memory.rs
@@ -197,52 +197,38 @@ pub(super) fn build_pipe_request<E: FieldElement<BaseField = Felt>>(
     combined_value
 }
 
-/// Builds `RCOMBBASE` requests made to the memory chiplet.
-pub(super) fn build_rcomb_base_request<E: FieldElement<BaseField = Felt>>(
+/// Builds `HORNERBASE` or `HORNEREXT` requests made to the memory chiplet.
+pub(super) fn build_horner_eval_request<E: FieldElement<BaseField = Felt>>(
     main_trace: &MainTrace,
     alphas: &[E],
     row: RowIndex,
     _debugger: &mut BusDebugger<E>,
 ) -> E {
-    let tz0 = main_trace.helper_register(0, row);
-    let tz1 = main_trace.helper_register(1, row);
-    let tzg0 = main_trace.helper_register(2, row);
-    let tzg1 = main_trace.helper_register(3, row);
-    let a0 = main_trace.helper_register(4, row);
-    let a1 = main_trace.helper_register(5, row);
-    let z_ptr = main_trace.stack_element(13, row);
-    let a_ptr = main_trace.stack_element(14, row);
+    let eval_point_0 = main_trace.helper_register(0, row);
+    let eval_point_1 = main_trace.helper_register(1, row);
+    let eval_point_ptr = main_trace.stack_element(13, row);
     let op_label = Felt::from(MEMORY_READ_WORD_LABEL);
 
     let ctx = main_trace.ctx(row);
     let clk = main_trace.clk(row);
 
-    let mem_req_1 = MemoryWordMessage {
-        op_label,
-        ctx,
-        addr: z_ptr,
-        clk,
-        word: [tz0, tz1, tzg0, tzg1],
-        source: "rcombbase req 1",
-    };
-    let mem_req_2 = MemoryWordMessage {
+    let mem_req = MemoryWordMessage {
         op_label,
         ctx,
-        addr: a_ptr,
+        addr: eval_point_ptr,
         clk,
-        word: [a0, a1, ZERO, ZERO],
-        source: "rcombbase req 2",
+        word: [eval_point_0, eval_point_1, ZERO, ZERO],
+        source: "horner_eval_* req",
     };
 
-    let combined_value = mem_req_1.value(alphas) * mem_req_2.value(alphas);
+    let value = mem_req.value(alphas);
 
     #[cfg(any(test, feature = "bus-debugger"))]
     {
-        _debugger.add_request(Box::new(mem_req_1), alphas);
-        _debugger.add_request(Box::new(mem_req_2), alphas);
+        _debugger.add_request(alloc::boxed::Box::new(mem_req), alphas);
     }
 
-    combined_value
+    value
 }
 
 // RESPONSES
diff --git a/processor/src/chiplets/aux_trace/bus/mod.rs b/processor/src/chiplets/aux_trace/bus/mod.rs
index 708af306b..68940bd29 100644
--- a/processor/src/chiplets/aux_trace/bus/mod.rs
+++ b/processor/src/chiplets/aux_trace/bus/mod.rs
@@ -6,9 +6,8 @@ use hasher::{
 };
 use kernel::{build_kernel_chiplet_responses, KernelRomMessage};
 use memory::{
-    build_mem_mload_mstore_request, build_mem_mloadw_mstorew_request,
-    build_memory_chiplet_responses, build_mstream_request, build_pipe_request,
-    build_rcomb_base_request, MemoryWordMessage,
+    build_horner_eval_request, build_mem_mload_mstore_request, build_mem_mloadw_mstorew_request,
+    build_memory_chiplet_responses, build_mstream_request, build_pipe_request, MemoryWordMessage,
 };
 use miden_air::{
     trace::{
@@ -24,10 +23,10 @@ use miden_air::{
     RowIndex,
 };
 use vm_core::{
-    ONE, OPCODE_CALL, OPCODE_DYN, OPCODE_DYNCALL, OPCODE_END, OPCODE_HPERM, OPCODE_JOIN,
-    OPCODE_LOOP, OPCODE_MLOAD, OPCODE_MLOADW, OPCODE_MPVERIFY, OPCODE_MRUPDATE, OPCODE_MSTORE,
-    OPCODE_MSTOREW, OPCODE_MSTREAM, OPCODE_PIPE, OPCODE_RCOMBBASE, OPCODE_RESPAN, OPCODE_SPAN,
-    OPCODE_SPLIT, OPCODE_SYSCALL, OPCODE_U32AND, OPCODE_U32XOR, ZERO,
+    ONE, OPCODE_CALL, OPCODE_DYN, OPCODE_DYNCALL, OPCODE_END, OPCODE_HORNERBASE, OPCODE_HORNEREXT,
+    OPCODE_HPERM, OPCODE_JOIN, OPCODE_LOOP, OPCODE_MLOAD, OPCODE_MLOADW, OPCODE_MPVERIFY,
+    OPCODE_MRUPDATE, OPCODE_MSTORE, OPCODE_MSTOREW, OPCODE_MSTREAM, OPCODE_PIPE, OPCODE_RESPAN,
+    OPCODE_SPAN, OPCODE_SPLIT, OPCODE_SYSCALL, OPCODE_U32AND, OPCODE_U32XOR, ZERO,
 };
 
 use super::{Felt, FieldElement};
@@ -111,8 +110,9 @@ impl<E: FieldElement<BaseField = Felt>> AuxColumnBuilder<E> for BusColumnBuilder
                 row,
                 debugger,
             ),
+            OPCODE_HORNERBASE => build_horner_eval_request(main_trace, alphas, row, debugger),
+            OPCODE_HORNEREXT => build_horner_eval_request(main_trace, alphas, row, debugger),
             OPCODE_MSTREAM => build_mstream_request(main_trace, alphas, row, debugger),
-            OPCODE_RCOMBBASE => build_rcomb_base_request(main_trace, alphas, row, debugger),
             OPCODE_HPERM => build_hperm_request(main_trace, alphas, row, debugger),
             OPCODE_MPVERIFY => build_mpverify_request(main_trace, alphas, row, debugger),
             OPCODE_MRUPDATE => build_mrupdate_request(main_trace, alphas, row, debugger),