diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index d06ceee..ccf1bd6 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -5851,7 +5851,10 @@ impl PlatformExprStrategy {
                 '}' => brace_depth -= 1,
                 '[' => bracket_depth += 1,
                 ']' => bracket_depth -= 1,
-                ',' if paren_depth == 0 && brace_depth == 0 && bracket_depth == 0 => {
+                ',' if paren_depth == ternary_paren_depth
+                    && brace_depth == 0
+                    && bracket_depth == 0 =>
+                {
                     start = idx + ch.len_utf8();
                 }
                 _ => {}
@@ -10432,6 +10435,33 @@ mod tests {
         assert!(!rewritten.contains('?'));
     }
 
+    #[test]
+    fn platform_expr_rewrites_multiple_nested_ternaries_inside_function_calls() {
+        let expr = r#"min(
+            rolling_mean_current("signal_close", 10) > rolling_mean_current("signal_close", 30)
+                ? 1.0
+                : 0.3,
+            min(
+                rolling_return_stddev_current("signal_close", 20) >= 0.025
+                    ? 0.3
+                    : 1.0,
+                1.0 - safe_div(
+                    day_factor("signal_close"),
+                    rolling_max_current("signal_close", 60)
+                ) >= 0.08
+                    ? 0.2
+                    : 1.0
+            )
+        )"#;
+        let rewritten = PlatformExprStrategy::normalize_expr(expr);
+
+        assert!(!rewritten.contains('?'), "{rewritten}");
+        PlatformExprStrategy::new(PlatformExprStrategyConfig::microcap_rotation())
+            .engine
+            .compile(&rewritten)
+            .unwrap_or_else(|error| panic!("rewritten expression must compile: {error}\n{rewritten}"));
+    }
+
     #[test]
     fn platform_expr_safe_div_supports_two_and_three_arg_forms() {
         let strategy = PlatformExprStrategy::new(PlatformExprStrategyConfig::microcap_rotation());