VC Portfolios (a16z, Battery Ventures, Sequoia Capital, Index Ventures participation)

Where this market publishes its structure

• a16z portfolio (a16z.com/portfolio/, page's own data-companies JSON) machine-readable, 876 companies, all with a website; 580 providers linked; 23 held (17 on a16z.com placeholder, 6 platform hosts)
• Battery Ventures companies (battery.com/company/ + admin-ajax loadbatterycompanieswithFilter, public, no nonce) machine-readable, 356 companies, 343 with a website on the company page; 247 linked. battery.com/our-companies/ 301 -> home, /companies/ 404
• Sequoia Capital companies (sequoiacap.com/companies/ via sitemap.xml) machine-readable, 432 company pages, 416 with a website; 288 linked. /our-companies/ server HTML carries only 21 featured cards (Framer). The site republished mid-crawl and served shell pages; those were re-fetched
• Index Ventures companies (indexventures.com/companies/ + JSON-LD on each company page) machine-readable, 330 companies, all with a url; 279 linked; seedcamp held (investor)

Own = declares at least one integration itself; covered = visible only because an aggregator, standards body, regulator or partner contract names it; distribution-only = listed only on cloud marketplaces it sells through, a channel reported beside, never counted as its own declared integrations; undeclared = nothing we can read, so no number; declares_compatibility = providers with a `compatible` shape vote, report only (kin, 2026-10-13): never counted as own, never in depth or position.

Taxonomy how this market maps onto apis.io

Derived 2026-10-22 from the 75 providers in this market we could resolve in the catalog. The percentage is the share of those providers carrying each one; it describes the market, not the tag or industry. Tag groups have no page of their own yet, so they are listed unlinked.

share of resolved cohort carrying it; tags >=0.20 & >=3 members (max 12, junk dropped), tag_groups >=0.20 (cooccurrence, non-cross-cutting; max 8), industries >=0.20 (max 6), areas >=0.10 (max 6; areas are keyword-matched and sparse), capabilities L1 >=0.20 (max 8); derive-market-taxonomy.py

Leaders by position (provisional)

Provisional: grouped by position, depth compared within a position only. Distribution (cloud marketplaces) and iPaaS bridges are counted beside position, never inside it. Unknown-builder listings are left out of position shares and counted here.

undeclared 75 · declares nothing we can read: no number