Financial datainfrastructure for AI agents.

Query 100M+ cleaned SEC and federal records from 1993 to today. Every row is source-traced, updated daily, and available through MCP or REST in milliseconds.

13F holdings, insider trades, Congress transactions, treasury yields, Fed rates, and market fundamentals.

Get API Key Explore Berkshire demo

Connected to ko-sec-data. I pulled Berkshire's latest 13F, filtered unchanged holdings, joined price history, and attached filing-level provenance to each row.

identify institutionmcp.connect · CIK 1067983

read filingget_institution_13f

compare holdingschanged rows only

trace pricesevents → chart markers

Berkshire Hathaway changes

2026-Q1 · $263.1B · 32 changed / 50 holdings

source traced

Holding

Action

Citation

GOOGLAlphabet Class A

ADD

+36.4M

13F · row 07

DALDelta Air Lines

NEW

+39.8M

13F · row 19

CVXChevron Corp.

TRIM

-45.8M

13F · row 05

BACBank of America

TRIM

-3.7M

13F · row 04

UNHUnitedHealth Group

EXIT

cleared

13F · row 31

GOOGLprice + 13F events

$172.40+12.4% QoQ

GOOGL accumulated this quarter13F-HR · accession traced

one prompt · three MCP tools · cited result — in milliseconds

0M+

Records

PB-scale

Columnar Store

$66.5T

Assets Tracked

<10ms

Query Target

1993

Coverage Since

Every structured SEC & federal dataset — one API

NVDABUYFidelity +22.8M sh · 2026-Q1

AAPLSELLPelosi · $5M-25M

MSFTSELLJPMorgan -20.6M sh · 2026-Q1

NTRASELLForm 144 · $17.2M

AMZNBUYCapital Research +28.4M sh · 2026-Q1

GOOGLSELLRep. Taylor · $1-15K

METASELLFidelity -5.7M sh · 2026-Q1

OWLSELLForm 144 · $69.5M

GOOGLBUYBlackRock +5.0M sh · 2026-Q1

HDBUYRep. Taylor · $1-15K

AVGOSELLCapital Intl -57.8M sh · 2026-Q1

NXTSELLD. Shugar · $8.4M

AAPLBUYMorgan Stanley +14.0M sh · 2026-Q1

TTWOSELLRep. Kean · $1-15K

TSLABUYMorgan Stanley +3.4M sh · 2026-Q1

OKLOSELLForm 144 · $3.9M

JPMBUYBank of America +8.9M sh · 2026-Q1

STTSELLRep. Auchincloss · $15-50K

NFLXBUYCapital Research +25.7M sh · 2026-Q1

NUESELLForm 144 · $3.4M

LLYSELLLilly Endowment -294K sh · 2026-Q1

PWRSELLRep. Evans · $1-15K

COSTBUYBank of America +774K sh · 2026-Q1

UNHBUYCharles Schwab +12.4M sh · 2026-Q1

NXPISELLForm 144 · $561K

VSELLBlackRock -4.0M sh · 2026-Q1

XOMBUYJPMorgan +15.2M sh · 2026-Q1

MASELLMastercard Fdn -4.9M sh · 2026-Q1

NVDABUYFidelity +22.8M sh · 2026-Q1

AAPLSELLPelosi · $5M-25M

MSFTSELLJPMorgan -20.6M sh · 2026-Q1

NTRASELLForm 144 · $17.2M

AMZNBUYCapital Research +28.4M sh · 2026-Q1

GOOGLSELLRep. Taylor · $1-15K

METASELLFidelity -5.7M sh · 2026-Q1

OWLSELLForm 144 · $69.5M

GOOGLBUYBlackRock +5.0M sh · 2026-Q1

HDBUYRep. Taylor · $1-15K

AVGOSELLCapital Intl -57.8M sh · 2026-Q1

NXTSELLD. Shugar · $8.4M

AAPLBUYMorgan Stanley +14.0M sh · 2026-Q1

TTWOSELLRep. Kean · $1-15K

TSLABUYMorgan Stanley +3.4M sh · 2026-Q1

OKLOSELLForm 144 · $3.9M

JPMBUYBank of America +8.9M sh · 2026-Q1

STTSELLRep. Auchincloss · $15-50K

NFLXBUYCapital Research +25.7M sh · 2026-Q1

NUESELLForm 144 · $3.4M

LLYSELLLilly Endowment -294K sh · 2026-Q1

PWRSELLRep. Evans · $1-15K

COSTBUYBank of America +774K sh · 2026-Q1

UNHBUYCharles Schwab +12.4M sh · 2026-Q1

NXPISELLForm 144 · $561K

VSELLBlackRock -4.0M sh · 2026-Q1

XOMBUYJPMorgan +15.2M sh · 2026-Q1

MASELLMastercard Fdn -4.9M sh · 2026-Q1

Works with every AI platform

One integration. Every agent.

Native MCP support for Claude, Cursor, and Windsurf. REST API for ChatGPT, Gemini, and everything else. SEC filings, macro indicators, and market data — ready in seconds.

cursor-agent

query

get_stock_holders

ticker=TSLA quarter=2025-12-31

4,233 positions analyzed

get_institution_holdings

ticker=TSLA action=ADDED,TRIMMED

85.4M rows · 6.1ms

response

Q4 2025: 3,840 institutions modified TSLA positions

1,894 added / 1,466 trimmed / 350 new / 130 exits

Top: Simplex +$5.8B · Jane Street -$6.2B

TSLATesla Inc

Q4 2025NET BUYING

Added

Trimmed

New

Exits

Top Movers — Exported

.CSV

.JSON

tsla_institutional_q4_2025.csv4,233 rows

Institution

Action

Value

Own%

Simplex Trading

NEW_BUY

+18.2M

+$5.8B

2.41%

Norges Bank

ADDED

+12.1M

+$5.3B

1.89%

Vanguard Group

ADDED

+9.8M

+$4.2B

7.22%

Jane Street

TRIMMED

-14.7M

-$6.2B

0.91%

Susquehanna

TRIMMED

-10.3M

-$4.6B

0.68%

85.4M rows analyzed

6.1ms

MCPOne command to connect

$ claude mcp add ko-sec-data --transport http https://mcp.ko.io/mcp

RESTStandard API access

$ curl https://api.ko.io/api/v1/institutions -H "X-API-Key: ko_live_..."

From raw SEC filings to structured queries in milliseconds · View documentation →

Proprietary Data Pipeline

Enterprise-grade extraction. Zero data loss.

A multi-stage ingestion engine that processes every filing from SEC EDGAR and 9 federal data feeds — format detection, schema normalization, entity resolution, and cross-validation in a single pass.

0M+

Records Processed

Live Datasets

Automated Pipelines

Federal Sources

We structure the filings nobody else will

apple-8k.htm

raw

<DOCUMENT><TYPE>8-K

Item 8.01 Other Events.

"On May 1, 2026, the Board of

Directors of Apple Inc. authorized

the repurchase of up to $110

billion of the Company's common

stock, with no expiration date..."

// Plain prose. No amount field. No event type. Buried in HTML.

ko.io · structured

prose → typed event

{

"event_type": "BUYBACK_AUTH",+ ko.io

"issuer": "Apple Inc.",+ ko.io

"amount_usd": 110_000_000_000,+ ko.io

"item": "8.01",

"board_approved": true,+ ko.io

"announced": "2026-05-01",+ ko.io

"confidence": 0.98+ ko.io

}

// Event classified + amount parsed by 3-model consensus.

Source8-K0000320193-26-000061· 2026-05-01filing ↗

Free-text prose, 5-level nested XML, fragmented multi-entity filings — normalized into one queryable schema.

Broader than any competitor.

SEC filings + macro economics + market microstructure + banking — in one unified API. No other platform covers this range.

SEC & Corporate

11/11

85M+ filings parsed

13F Institutional Holdings

Form 4 Insider Trades

Congress STOCK Act

10-K/10-Q Financials

Form 144 Notices

SC 13D/G Activism

Form D Placements

8-K Buybacks

Mgmt Changes (8-K)

Exec Comp (DEF 14A)

N-PORT Fund Holdings

Rates, Macro & Energy

8/8

8 federal sources

Treasury Yield Curve

Treasury Auctions

U.S. Public Debt

Fed Funds / SOFR

Fed Balance Sheet

Bank Credit (H.8)

CPI / PPI / NFP / JOLTS

Crude Oil & Nat Gas

Market Micro & Banking

8/8

44M+ market signals

FINRA Short Volume

SEC Fails to Deliver

Stock Prices (OHLCV)

CFTC Positioning

Financial Stress (OFR)

FDIC Bank Financials

FDIC Bank Directory

Bank Failures (1934–)

Questions your agent can answer

you

Chart NVIDIA's buyback pace against its stock price over 8 quarters.

-> get_stock_activity + get_stock_prices(NVDA, 8q)

100M+Data Records

48Structured Datasets

<10msp99 Latency

99.9%Uptime SLA

Built for teams at

What our users say

From AI agent builders to research teams — real feedback from people building with ko.io.

“Replaced our Bloomberg 13F workflow entirely. The quarter-over-quarter changes are pre-computed — saved us probably 20 hours last filing season. API response times are absurdly fast.”

Marcus Chen

Quant Researcher · New York

“I check congressional trades every morning before market open. The disclosure delay field is something I genuinely haven't found elsewhere. Worth it for that alone.”

Sarah Mitchell

Portfolio Manager

“Clean API, good docs. Built an insider trading alert bot over a weekend. Only wish is more granular webhook support — for now I poll every few minutes which works fine.”

James Park

Full-Stack Developer

“We track position changes across 50+ institutions each quarter. The data quality is excellent — no more wrestling with raw EDGAR XML. The free tier was enough to evaluate before our team committed.”

Emily Rodriguez

Equity Research Analyst

“Migrated from a competitor and the ClickHouse backend is noticeably faster. The MCP integration is a nice touch for quick exploration. Documentation could use a few more examples but overall solid.”

David Okonkwo

Data Engineer

“Used the Form 4 data to cross-reference insider selling patterns for a story. The structured data made what would've been weeks of EDGAR scraping into an afternoon of analysis.”

Priya Kapoor

Financial Journalist

Your AI already knows finance.
Give it the real data.

Every answer grounded in 100% source-traced SEC filings — your AI stops hallucinating numbers and starts citing the filing. The same data, three ways: MCP for agents, REST for apps, bulk download for funds.

Get Free API Key Documentation →