diff --git a/docs/utilities.md b/docs/utilities.md
index 631c7b7d..e4c57481 100644
--- a/docs/utilities.md
+++ b/docs/utilities.md
@@ -148,7 +148,8 @@ formatSize("0.00123456789", szDecimals); // "0.00123"
 For spot markets, `getSzDecimals` returns the `szDecimals` of the **base** token — which is what both formatters expect
 for an order on that pair.
 
-Outcome markets carry no `szDecimals` metadata, so `getSzDecimals` always returns `5` for them.
+Outcome markets carry no `szDecimals` metadata. Their shares trade in whole units, so `getSzDecimals` always returns `0`
+for them.
 
 ### Spot pair IDs
 
diff --git a/src/utils/_symbolConverter.ts b/src/utils/_symbolConverter.ts
index 764da539..ba257824 100644
--- a/src/utils/_symbolConverter.ts
+++ b/src/utils/_symbolConverter.ts
@@ -221,8 +221,8 @@ export class SymbolConverter {
         if (!slug) return;
 
         this._nameToAssetId.set(slug, 100000000 + 10 * outcome.outcome + sideIdx);
-        // Outcome markets are absent from szDecimals metadata; they are all 5
-        this._nameToSzDecimals.set(slug, 5);
+        // Outcome markets are absent from szDecimals metadata; shares trade in whole units
+        this._nameToSzDecimals.set(slug, 0);
       });
     });
   }
@@ -355,7 +355,7 @@ export class SymbolConverter {
    * converter.getSzDecimals("BTC"); // → 5
    * converter.getSzDecimals("HYPE/USDC"); // → 2
    * converter.getSzDecimals("test:ABC"); // → 0
-   * converter.getSzDecimals("btc-above-61720-yes-jun-08-0600"); // → 5
+   * converter.getSzDecimals("btc-above-61720-yes-jun-08-0600"); // → 0
    * ```
    */
   getSzDecimals(name: string): number | undefined {
diff --git a/tests/utils/symbolConverter.test.ts b/tests/utils/symbolConverter.test.ts
index 46a73d7c..fbdda917 100644
--- a/tests/utils/symbolConverter.test.ts
+++ b/tests/utils/symbolConverter.test.ts
@@ -293,7 +293,7 @@ Deno.test("SymbolConverter outcome markets", async (t) => {
   });
 
   await t.step("getSzDecimals()", () => {
-    assertEquals(converter.getSzDecimals("nba-finals-game-3-san-antonio"), 5);
-    assertEquals(converter.getSzDecimals("2026-world-cup-champion-argentina-yes"), 5);
+    assertEquals(converter.getSzDecimals("nba-finals-game-3-san-antonio"), 0);
+    assertEquals(converter.getSzDecimals("2026-world-cup-champion-argentina-yes"), 0);
   });
 });