diff --git a/design-system/templates/chicorytv-admin/MultiCollections.jsx b/design-system/templates/chicorytv-admin/MultiCollections.jsx
index 6bb0f0129..8320add89 100644
--- a/design-system/templates/chicorytv-admin/MultiCollections.jsx
+++ b/design-system/templates/chicorytv-admin/MultiCollections.jsx
@@ -18,12 +18,20 @@
   ];
 
   const EDIT_ITEMS = [
-    { kind: "manual", name: "Friends", scheduleAsGroup: true },
-    { kind: "manual", name: "Seinfeld", scheduleAsGroup: true },
-    { kind: "manual", name: "The Office (US)", scheduleAsGroup: false },
-    { kind: "smart", name: "Sitcoms — Unwatched, Short", scheduleAsGroup: false },
+    { kind: "manual", name: "Friends", scheduleAsGroup: true, weight: 3 },
+    { kind: "manual", name: "Seinfeld", scheduleAsGroup: true, weight: 2 },
+    { kind: "manual", name: "The Office (US)", scheduleAsGroup: false, weight: 1 },
+    { kind: "smart", name: "Sitcoms — Unwatched, Short", scheduleAsGroup: false, weight: 1 },
   ];
 
+  // Per-source weight bounds mirror the API's MultiCollectionItemWeight validator (1..1000, #404).
+  const WEIGHT_MIN = 1;
+  const WEIGHT_MAX = 1000;
+  const clampWeight = (raw) => {
+    const n = Math.trunc(Number(raw));
+    return Number.isFinite(n) ? Math.min(WEIGHT_MAX, Math.max(WEIGHT_MIN, n)) : WEIGHT_MIN;
+  };
+
   const flushRow = (first) => ({
     display: "flex",
     alignItems: "center",
@@ -73,7 +81,7 @@
     );
   }
 
-  function EditItemRow({ item, first }) {
+  function EditItemRow({ item, first, weight, pct, onWeight }) {
     const [checked, setChecked] = React.useState(item.scheduleAsGroup);
     return (
       <div style={flushRow(first)}>
@@ -92,6 +100,31 @@
           {item.name}
         </span>
         <Badge tone="neutral">{item.kind === "smart" ? "Smart" : "Manual"}</Badge>
+        {/* Per-source weight (#404): relative share of airtime under the Weighted Shuffle order.
+            Bounded 1..1000 (API validator); the % is a display of the integer share (3:1 → 75/25). */}
+        <div style={{ display: "inline-flex", alignItems: "center", gap: 6 }} title="Relative share of airtime under the Weighted Shuffle playback order">
+          <span style={{ font: "var(--text-xs)/1 var(--font-sans)", color: "var(--text-secondary)" }}>Weight</span>
+          <input
+            type="number"
+            min={WEIGHT_MIN}
+            max={WEIGHT_MAX}
+            value={weight}
+            aria-label={`Weight for ${item.name}`}
+            onChange={(e) => onWeight(e.target.value)}
+            onBlur={(e) => onWeight(String(clampWeight(e.target.value)))}
+            style={{
+              width: 62,
+              height: 30,
+              padding: "0 8px",
+              borderRadius: "var(--radius-sm)",
+              border: "1px solid var(--border-hairline)",
+              background: "var(--ctv-bg-sunken)",
+              color: "var(--text-primary)",
+              font: "var(--text-sm)/1 var(--font-sans)",
+            }}
+          />
+          <span style={{ ...mono, minWidth: 34, textAlign: "right", font: "var(--text-2xs)/1 var(--font-mono)", color: "var(--text-faint)" }}>{pct}%</span>
+        </div>
         <label style={{ display: "inline-flex", alignItems: "center", gap: 7, cursor: "pointer" }} title="Schedule as group">
           <Switch checked={checked} onChange={setChecked} size="sm" />
           <span style={{ font: "var(--text-xs)/1 var(--font-sans)", color: "var(--text-secondary)", whiteSpace: "nowrap" }}>Schedule as group</span>
@@ -109,6 +142,15 @@
     const [smartSel, setSmartSel] = React.useState("");
     const items = existing ? EDIT_ITEMS : [];
 
+    // Weights are held per-item (as strings, so the number field edits smoothly); the % share is a
+    // display of the integer weights, and "Reset to fair share" sets every weight back to 1 (#404).
+    const [weights, setWeights] = React.useState(items.map((it) => String(it.weight ?? WEIGHT_MIN)));
+    const totalWeight = weights.reduce((s, w) => s + clampWeight(w), 0);
+    const pctFor = (i) => (totalWeight > 0 ? Math.round((clampWeight(weights[i]) / totalWeight) * 100) : 0);
+    const setWeightAt = (i, v) => setWeights((cur) => cur.map((w, j) => (j === i ? v : w)));
+    const alreadyFairShare = items.length > 0 && weights.every((w) => clampWeight(w) === WEIGHT_MIN);
+    const resetToFairShare = () => setWeights(items.map(() => String(WEIGHT_MIN)));
+
     const collectionOptions = [
       { label: "Select a collection…", value: "" },
       { label: "Action Movies", value: "1" },
@@ -162,7 +204,28 @@
                 No collections added yet.
               </div>
             ) : (
-              items.map((item, i) => <EditItemRow key={item.kind + ":" + item.name} item={item} first={i === 0} />)
+              <React.Fragment>
+                {items.map((item, i) => (
+                  <EditItemRow
+                    key={item.kind + ":" + item.name}
+                    item={item}
+                    first={i === 0}
+                    weight={weights[i]}
+                    pct={pctFor(i)}
+                    onWeight={(v) => setWeightAt(i, v)}
+                  />
+                ))}
+                {/* fair-share footer (#404): fair-share is not a separate mode — it is Weighted Shuffle
+                    with all weights left at 1, so this resets rather than writing a different order. */}
+                <div style={{ display: "flex", alignItems: "center", gap: 12, padding: "10px var(--pad-cell-x)", borderTop: "1px solid var(--border-hairline)" }}>
+                  <span style={{ flex: 1, minWidth: 0, font: "var(--text-xs)/1.4 var(--font-sans)", color: "var(--text-secondary)" }}>
+                    Weights set each source’s share of airtime under the <strong>Weighted Shuffle</strong> playback order (set on the schedule item). Equal weights = fair share.
+                  </span>
+                  <Button size="sm" variant="ghost" disabled={alreadyFairShare} onClick={resetToFairShare}>
+                    Reset to fair share
+                  </Button>
+                </div>
+              </React.Fragment>
             )}
           </Card>
         </div>