Mcp Vc Accelerator Portfolio List Builder

com.mambabuiltPublished by mambabuilt.comv1.0.2Updated Nov 7, 2026

Portfolio company lists from Y Combinator, a16z, Sequoia, Accel, and any VC portfolio page

The publisher's own server: PortfolioFit

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Overview

AI-generated overview

Builds lists of portfolio companies backed by VCs and accelerators, returning one row per company with name, domain, website, description and stage.

What you can do
  • Build a portfolio company list from investor or accelerator names, or from any portfolio page URL
  • Filter Y Combinator results by batch, industry, region, status and search words
  • Return one row per company with name, domain, website, description and stage, batch or status where available
  • Optionally open company pages for extra detail, including YC founder names, LinkedIn links and open role counts
  • Skip companies already returned by an earlier run using a named memory key
When to use it
Useful when you want a structured table of companies backed by a given VC or accelerator, for sourcing, market mapping or research, without collecting the portfolio pages by hand.
Requirements
Runs locally via npx, so Node.js 18 or newer is needed. Requires an Apify account and an Apify API token supplied as the APIFY_TOKEN environment variable; the tool is listed without a token but calls need one. All work runs on Apify, so network access is required.
Before you install
Calls spend money on your Apify account: a per-run start fee plus a per-company-row fee, with rows lacking a domain and summary rows free; an optional max_charge_usd cap can limit cost. The APIFY_TOKEN secret is passed to the local process. Portfolio pages are fetched from third-party investor sites through Apify, and the only_new option stores a memory of previously delivered companies under a state key.

Installation

In SourceWeft

  1. Open Mcp Vc Accelerator Portfolio List Builder in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

VC and Accelerator Portfolio List Builder MCP Server

[Glama score] [MCP Registry] [npm version] [npm downloads] [license] [mcpservers.org]

[VC Accelerator Portfolio List Builder MCP server]

An MCP server for the Mamba Labs VC and Accelerator Portfolio List Builder actor on Apify. Give it investors or accelerators by name, or portfolio page URLs, and get one row per portfolio company with its name, domain, website, description, and stage, batch, or status where the source gives it.

What's Inside

What it does

Y Combinator is read from its public company directory and can be filtered by batch, industry, region, status, and search words. Andreessen Horowitz (a16z), Sequoia Capital, Accel, Index Ventures, Founders Fund, Greylock, Lightspeed Venture Partners, Khosla Ventures, First Round Capital, Techstars, and Antler are built in, and any other portfolio page works by URL. Each source also returns one free summary row with the count and the way it was read, or the reason it returned nothing. Pages are read from the investor's own site and robots.txt is obeyed.

All of the work runs on Apify. This package is a thin client that starts the actor run, waits for it, and hands back the dataset rows.

Quick start

You need Node.js 18 or newer and an Apify account with an API token.

Add this to your Claude Desktop config (claude_desktop_config.json), Cursor, or any MCP client:

json
{  "mcpServers": {    "mamba-vc-accelerator-portfolio-list-builder": {      "command": "npx",      "args": [        "-y",        "@mambalabsdev/mcp-vc-accelerator-portfolio-list-builder"      ],      "env": {        "APIFY_TOKEN": "your-apify-token"      }    }  }}

Restart the client. The build_portfolio_list tool appears.

Prerequisites

Example prompts

  • "List the Y Combinator W25 companies in fintech with their websites."
  • "Which companies are in Accel's and Greylock's portfolios?"
  • "Pull the portfolio of https://example.vc/portfolio into a table."

Tool

build_portfolio_list. One tool. Example arguments:

json
{  "investors": ["Y Combinator"],  "yc_batches": ["W25"],  "max_companies_per_source": "100"}

Inputs

Every buyer facing input of the actor. Omitted inputs take the actor's own defaults. Numbers and yes or no options can be given as a number or boolean (100, true) or as text ("100", "true"); the server always sends them to the actor as text, which is what the actor accepts; a value that does not parse comes back as one free row that names the field.

InputTypeRequiredDescription
investorsarraynoBuilt in names or portfolio page URLs, up to 25. Default Y Combinator.
yc_batchesarraynoY Combinator batches, for example S24, W25.
yc_industriesarraynoY Combinator industries.
yc_regionsarraynoY Combinator regions.
yc_statusarraynoactive, acquired, public, inactive.
yc_querystringnoWords to search the Y Combinator directory for.
max_companies_per_sourcenumber or stringnoCompany rows per source, up to 10000, such as 100 or "100". Default 500.
open_company_pagesboolean or stringnotrue or false, or "true" or "false". Open per company pages when needed. Default true.
max_detail_pagesnumber or stringnoCompany pages opened per source, up to 1000. Default 200.
yc_company_pagesboolean or stringnotrue or false, or "true" or "false". Y Combinator only: open each company's YC page for founder names, founder LinkedIn links, and the open role count. Needs open_company_pages true. Default false.
only_newboolean or stringnotrue or false, or "true" or "false". Skip companies an earlier run returned. Default false.
state_keystringnoName for the only new companies memory.
max_charge_usdnumber or stringnoOptional cost cap for the run, in USD.
proxy_modestringnoauto or direct. Default auto.

Pricing

Pay per event on Apify, billed to your Apify account. Prices in USD.

EventFree planBronzeSilverGold
company-row, per portfolio company with a domain$0.007$0.00665$0.0063$0.00595
apify-actor-start, per run start$0.0025$0.0025$0.0025$0.0025

Rows with no domain, source summary rows, and already delivered companies are free. Mamba Labs pays the platform costs of the run, Apify proxy traffic included.

Full actor documentation

apify.com/mambalabs/vc-accelerator-portfolio-list-builder

License

MIT. See LICENSE.

Source: README.md at commit 3ede151

Tools

1

build_portfolio_list

Build a portfolio company list

Build a list of the companies a venture capital firm or accelerator backs. Give investor or accelerator names (Y Combinator, a16z, Sequoia, Accel, Index Ventures, Founders Fund, Greylock, Lightspeed, Khosla, First Round, Techstars, Antler) or any portfolio page URL. Returns one flat row per portfolio company (name, domain, website, description, and stage, batch, or status where the source gives it) plus one free summary row per source saying how it was read or why it returned nothing. Y Combinator is filterable by batch, industry, region, status, and search words. Pages are read from the investor's own site and robots.txt is obeyed. A run that does not succeed is returned as an error with its run ID. Read-only; requires an APIFY_TOKEN and is billed per company row with a domain.

Parametersonly_newyc_queryinvestorsstate_keyyc_statusproxy_modeyc_batchesyc_regionsyc_industriesmax_charge_usdmax_detail_pagesyc_company_pages+2 more

Version history

3
  1. v1.0.2LatestNov 5, 2026
  2. v1.0.1Oct 29, 2026
  3. v1.0.0Oct 26, 2026

Score

90% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts
  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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