---
title: "Market Capitalization Weighted Portfolio"
method: POST
path: "/portfolios/optimization/market-capitalization-weighted"
tags: ["Portfolio Optimization"]
---

# Market Capitalization Weighted Portfolio

`POST /portfolios/optimization/market-capitalization-weighted`

## Request

- Base URL: `https://api.portfoliooptimizer.io/v1`
- URL: `https://api.portfoliooptimizer.io/v1/portfolios/optimization/market-capitalization-weighted`
- Auth: API key in header `X-API-Key`

Compute the asset weights of the market capitalization-weighted portfolio.

References
 * [Wikipedia, Capitalization-weighted Index](https://en.wikipedia.org/wiki/Capitalization-weighted_index)

## Request body

- object
  - `assets` integer, required: The number of assets
  - `assetsMarketCapitalizations` number[], required: assetsMarketCapitalizations[i] is the market capitalization of the asset i

## Response `200`

OK

- object
  - `assetsWeights` number[], required: assetsWeights[i] is the weight of the asset i in the portfolio, in percentage

## Changes

- **2026-06-08** `614076795988`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/portfoliooptimizer/apis/portfolio-optimizer/changes/portfolios/optimization/market-capitalization-weighted/post.md)

---

[API](https://skmtc.dev/portfoliooptimizer/apis/portfolio-optimizer.md) - [All operations](https://skmtc.dev/portfoliooptimizer/apis/portfolio-optimizer/llms.txt) - [OpenAPI document](https://skmtc.dev/portfoliooptimizer/apis/portfolio-optimizer/revisions/9d075aa717bf?raw)