13F Changes API: Get a manager's quarter-over-quarter 13F changes — SEC Form 13F

Get a manager's quarter-over-quarter 13F changes — new, exited, increased and decreased positions with values and shares for both quarters. The premium derived layer at competitors, computed from primary filings in one call.

$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/changes — product id sec_13f_manager_changes. Over MCP, call answerpool_get with product_id=sec_13f_manager_changes.

curl "https://answerpool.io/v1/sec/13f/changes?cik=0001566307"

# with a prepaid credit key
curl -H "Authorization: Bearer ck_live_..." "https://answerpool.io/v1/sec/13f/changes?cik=0001566307"

Live call: https://answerpool.io/v1/sec/13f/changes?cik=0001566307 · JSON sample: /v1/samples/sec_13f_manager_changes

What does the answer look like?

A representative response, the same static sample served at /v1/samples/sec_13f_manager_changes.

changes

{
 "as_of": "2026-08-31T17:00:00Z",
 "periods_held": [
  "2025-12-31",
  "2025-09-30"
 ],
 "cik": "0001566307",
 "manager_name": "Ramiah Investment Group",
 "period": "2025-12-31",
 "prev_period": "2025-09-30",
 "count": 1,
 "changes": [
  {
   "issuer": "NVIDIA CORP",
   "cusip": "67066G104",
   "change": "new",
   "value_usd": 500000,
   "prev_value_usd": null,
   "shares": 4000,
   "prev_shares": null
  }
 ],
 "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 1 day · every response carries a result_id you can resolve at /v1/provenance.

When should you use it?

Flow questions per manager; needs the manager CIK.

What you skip building

• two-quarter joins
• amendment handling
• diff logic

When should you not use it?

Intra-quarter trades — 13F shows quarter-end snapshots only.

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