Largest institutional buys per CUSIP this quarter (cross-fund leaderboard)
Derived cross-fund leaderboard of quarter-over-quarter institutional accumulation. Walks the top-N filers in the requested quarter (ranked by AUM), diffs each filer's per-position share count against the immediately-prior retained quarter, aggregates the POSITIVE share-deltas by CUSIP, and returns the largest rollups by dollar value. Each row reports total shares added, total value added (in $thousands), distinct fund count, and a sample of the top contributing buyers. PUT/CALL option rows are excluded (stock-accumulation signal only). Sales are excluded - this is a strict 'buy' signal. Optional ?quarter=<stem> scans a historical quarter (default: newest retained stem; from_stem is auto-resolved to the next-prior stem in the retention manifest). v1 limitation: scope bounded to top-N filers (default 100, max 300); full-universe scan deferred to v2 via ingest-side pre-aggregation.
Query parameters
Optional retention-manifest stem. When omitted, scan the newest available stem.
Optional retention-manifest stem. When omitted, scan the newest available stem.
Top-N institutional managers by AUM to include in the scan (10..80, default 50). The ceiling is measured, not chosen: on prod, one request at a time, 80 answers in about 7s and 90 kills the worker outright (INFRA-46). The previous range allowed up to 300 and defaulted to 100, so the DEFAULT call took the whole API down. Raising this bound means re-measuring MemoryWorkingSet under a scan, not reasoning about it.
Top-N institutional managers by AUM to include in the scan (10..80, default 50). The ceiling is measured, not chosen: on prod, one request at a time, 80 answers in about 7s and 90 kills the worker outright (INFRA-46). The previous range allowed up to 300 and defaulted to 100, so the DEFAULT call took the whole API down. Raising this bound means re-measuring MemoryWorkingSet under a scan, not reasoning about it.
Maximum CUSIP rows returned (1..200, default 50).
Maximum CUSIP rows returned (1..200, default 50).
Response
Cross-fund leaderboard of CUSIPs accumulated this quarter.
Example response
{
"data": {
"top_buys": [
{
"cusip": "037833100",
"sample_buyers": [
{
"cik": "0001067983",
"manager_name": "BERKSHIRE HATHAWAY INC"
}
]
}
]
},
"meta": {
"endpoint": "/api/v1/fred/us/cpi",
"data_time": "2026-04-16T14:30:00Z",
"response_time": "2026-04-16T14:30:12Z",
"provider": "Sugra API v1.0.1",
"source": "sugra_crypto",
"attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
"fallback_chain": [
"sugra_crypto",
"sugra_finance"
]
}
}