13F Crowding Trend API: Institutional breadth in an issuer over the quarters we hold: holders — SEC Form 13F

Institutional breadth in an issuer over the quarters we hold: holders, value and shares per quarter with changes, plus the managers that entered or exited last quarter. Built from accumulated 13F history, not a single snapshot.

$0.05 per call — pay with prepaid card credits (Authorization: Bearer ck_live_…, packs from $1) or with USDC over x402: call it, get 402 with the price, retry signed. Failed calls are never charged.

How do you call it?

GET /v1/sec/13f/crowding — product id sec_13f_crowding. Over MCP, call answerpool_get with product_id=sec_13f_crowding.

curl "https://answerpool.io/v1/sec/13f/crowding?issuer=NVIDIA"

# with a prepaid credit key
curl -H "Authorization: Bearer ck_live_..." "https://answerpool.io/v1/sec/13f/crowding?issuer=NVIDIA"

Live call: https://answerpool.io/v1/sec/13f/crowding?issuer=NVIDIA · JSON sample: /v1/samples/sec_13f_crowding

What does the answer look like?

A representative response, the same static sample served at /v1/samples/sec_13f_crowding.

series

{
 "as_of": "2026-09-03T15:30:00Z",
 "issuer_query": "NVIDIA",
 "issuer_matched": "NVIDIA CORP",
 "periods_covered": 2,
 "series": [
  {
   "period": "2025-12-31",
   "holders": 412,
   "total_value_usd": 91200000000.0,
   "total_shares": 640000000.0,
   "holders_change": null,
   "value_change_pct": null
  },
  {
   "period": "2026-03-31",
   "holders": 437,
   "total_value_usd": 99400000000.0,
   "total_shares": 662000000.0,
   "holders_change": 25,
   "value_change_pct": 8.99
  }
 ],
 "new_managers": [
  "Ramiah Capital Group"
 ],
 "exited_managers": [],
 "trend": "building",
 "note": "Holder counts deduplicate amendments to one filing per manager per quarter. 13F is quarterly with the SEC's ~45-day lag, and covers only managers above the $100M threshold, so this is institutional breadth, not total ownership.",
 "disclaimer": "From SEC Form 13F filings (public domain), reported quarterly with a filing lag; not investment advice.",
 "refresh_after": "2026-09-17T11:15:00.000Z"
}

How fresh is it, and where does the data come from?

The fastest source behind this answer can change every 15 minutes, so every response carries a refresh_after timestamp — right now it would be 2026-09-17T11:15:00.000Z. Schedule the next call on that value rather than on a guess.

• SEC EDGAR (US federal public domain) — upstream: https://efts.sec.gov

Method version 0.1.0 · serving cache 7 days · every response carries a result_id you can resolve at /v1/provenance.

When should you use it?

You need the direction of institutional interest in an issuer over time.

What you skip building

• fetching every quarter and diffing
• amendment double-counting
• per-manager deduplication

When should you not use it?

The current holder list (/v1/sec/13f/holders) or one manager's book (/v1/sec/13f/manager).

Where else can you find this?

• Catalog entry (JSON, free)
• OpenAPI schema — input and output types, prices, the 402 flow
• llms.txt — every product in one plain-text document