TickerInside ETF Holdings

Stock comparison and weight in an ETF

compare_stocks

Read-onlyIdempotent

Use this when the user asks how two US stocks compare on size, valuation, returns, risk or correlation, or what weight and rank one stock has inside one named ETF, for example META in QQQ. For two stocks it returns market cap, P/E and dividend yield from market data, returns, volatility, worst fall, beta, the correlation of weekly returns over up to three years and the covered ETFs holding both. For a stock and an ETF it returns whether the ETF holds the stock, at what weight and rank among the shares it holds outright, with the date of the ETF's holdings; a derivative-based ETF's swaps, futures and options are in its profile (get_etf_holdings), not here. A stock is in the data with about two years of US prices, and sooner for a recent listing a covered ETF holds. Returns are past, not a forecast. Not for comparing two ETFs (compare_etfs), or a company's business or products.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`a`	Yes	A US stock ticker, for example NVDA. An ETF ticker also works on one side, for example QQQ.
`b`	Yes	The other ticker, for example AMD.

Output Schema

TableJSON Schema

Name	Required	Description
`pair`	No
`source`	No
`covered`	No
`membership`	No	For a stock and an ETF.
`weeks_used`	No
`not_in_data`	No
`prices_as_of`	No
`correlation_3y`	No
`funds_holding_both`	No
`funds_holding_both_count`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 12, 2026
- changedOutput schema / properties / membership / description
```
Previous value: -"For a stock and a fund."New value: +"For a stock and an ETF."
```

Changed3 schema fields changedOct 6, 2026

changedInput schema / properties / a / description

Previous value: -"A US stock ticker, for example NVDA. An ETF ticker also works."New value: +"A US stock ticker, for example NVDA. An ETF ticker also works on one side, for example QQQ."

changedInput schema / properties / b / description

Previous value: -"The other ticker."New value: +"The other ticker, for example AMD."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "patternProperties": {
+    "^[A-Z0-9.\\-^=/ *&]{1,16}$": {
+      "properties": {
+        "beta": {
+          "description": "Over three years.",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "dividend_yield_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "expense_ratio_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "kind": {
+          "enum": [
+            "stock",
+            "fund"
+          ],
+          "type": "string"
+        },
+        "market_cap_bn": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "name": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "pe": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "return_1y_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "return_3y_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "volatility_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "worst_fall_3y_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        }
+      },
+      "required": [
+        "kind"
+      ],
+      "type": "object"
+    }
+  },
+  "properties": {
+    "correlation_3y": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "covered": {
+      "type": "boolean"
+    },
+    "funds_holding_both": {
+      "items": {
+        "properties": {
+          "fund": {
+            "type": "string"
+          },
+          "holdings_as_of": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "weight_a_pct": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "weight_b_pct": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "fund"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "funds_holding_both_count": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    },
+    "membership": {
+      "description": "For a stock and a fund.",
+      "properties": {
+        "holdings_as_of": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "in_fund": {
+          "type": "boolean"
+        },
+        "rank": {
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "weight_pct": {
+          "type": [
+            "number",
+            "null"
+          ]
+        }
+      },
+      "required": [
+        "in_fund"
+      ],
+      "type": "object"
+    },
+    "not_in_data": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "pair": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "prices_as_of": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "source": {
+      "properties": {
+        "api_urls": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "license": {
+          "type": "string"
+        },
+        "provider": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "provider",
+        "license",
+        "api_urls"
+      ],
+      "type": "object"
+    },
+    "weeks_used": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

First observedSep 26, 2026

TDQS

Score is being calculated.

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