diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index 4100180..70e08df 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -3650,7 +3650,13 @@ impl PlatformExprStrategy {
             allow_sell: candidate.allow_sell,
             touched_upper_limit,
             touched_lower_limit,
-            listed_days: if candidate.is_new_listing { 0 } else { 365 },
+            listed_days: factor
+                .extra_factors
+                .get("listed_days")
+                .copied()
+                .filter(|value| value.is_finite() && *value >= 0.0)
+                .map(|value| value.floor() as i64)
+                .unwrap_or(-1),
             stock_ma_short,
             stock_ma_mid,
             stock_ma_long,
@@ -15902,7 +15908,7 @@ mod tests {
                 pe_ttm: 8.0,
                 turnover_ratio: Some(1.0),
                 effective_turnover_ratio: Some(1.0),
-                extra_factors: BTreeMap::new(),
+                extra_factors: BTreeMap::from([("listed_days".to_string(), 263.0)]),
             }],
             vec![CandidateEligibility {
                 date,
@@ -15965,6 +15971,7 @@ mod tests {
         assert!((stock.market_cap_bn - 18.0).abs() < 1e-9);
         assert!((stock.free_float_cap - 9.0).abs() < 1e-9);
         assert!((stock.free_float_cap_bn - 9.0).abs() < 1e-9);
+        assert_eq!(stock.listed_days, 263);
         assert_eq!(stock.close, 10.0);
         assert!(stock.high.is_nan());
         assert!(stock.low.is_nan());