opendart-py

Async Python client for DART (Korea FSS) OpenAPI — the official Korean corporate disclosure system.

Built and maintained by Alpha Lenz — an AI-powered Korean equity research platform. This is the same DART client that powers our daily ingestion of 10,000+ KOSPI/KOSDAQ filings.

A lightweight async Python client for the DART OpenAPI — Korea's equivalent of SEC EDGAR, run by the Financial Supervisory Service. Fetch filings, financial statements, ownership reports, and major corporate decisions for any KOSPI / KOSDAQ / KONEX listed company in one line.

If you've ever used sec-edgar-downloader or edgar for US equities, this is the same idea — but for the Korean market (~2,400 listed companies, ~$2T market cap).

• Async-first — built on httpx + asyncio. Drops into FastAPI / aiohttp servers
• Typed — Pydantic v2 models for request and response validation
• No globals — no env-var or singleton magic. API key is passed explicitly
• Zero infra — no Redis or DB dependency. Inject your own cache backend if you need one

Install

pip install opendart-py

Quickstart

import asyncio
from opendart import DartClient, DisclosureSearchParams, MarketType

async def main():
    async with DartClient(api_key="YOUR_DART_KEY") as dart:
        disclosures, total = await dart.search_disclosures(
            DisclosureSearchParams(
                bgn_de="20260101",
                end_de="20260131",
                corp_cls=MarketType.KOSPI.value,
            )
        )
        for d in disclosures[:5]:
            print(d.rcept_dt, d.corp_name, d.report_nm)

asyncio.run(main())

Get a DART API key (free, 20,000 requests/day): https://opendart.fss.or.kr/uss/umt/login/loginPage.do

Stock code → corp_code

DART uses its own 8-digit corp_code rather than the 6-digit KRX stock code. To convert:

from opendart import CorpCodeResolver

resolver = CorpCodeResolver(api_key="YOUR_DART_KEY")
samsung = await resolver.resolve("005930")  # → "00126380"

The full corpCode.xml is downloaded once and cached in memory. For multi-process deployments you can inject any async cache backend (e.g. Redis):

import redis.asyncio as redis

cache = redis.from_url("redis://localhost")
resolver = CorpCodeResolver(api_key="...", cache=cache)

Coverage

Category	DART group	Methods
Disclosure search	—	search_disclosures, get_document
Company overview	DS001	get_company_overview
Periodic reports	DS002	get_dividends, get_major_shareholders, get_shareholder_changes, get_executives, get_executive_compensation, get_top_compensation, get_treasury_stock, get_employees, get_minor_shareholders, get_audit_opinion
Financial statements	DS003	get_single_account, get_full_statements, get_financial_indicators
Ownership reports	DS004	get_major_stock_reports, get_executive_stock_reports
Major decisions	DS005	get_cb_issuance, get_bw_issuance, get_paid_increase, get_free_increase, get_capital_reduction, get_merger_decision
Securities registration	DS006	get_equity_registration, get_debt_registration

Examples

Treasury stock (Korea Value-Up program tracking)

treasury = await dart.get_treasury_stock(
    corp_code="00126380",  # Samsung Electronics
    bsns_year="2025",
    reprt_code="11011",  # Annual report
)

reprt_code: 11011 annual / 11012 half-year / 11013 Q1 / 11014 Q3.

Convertible bond issuance monitoring

cb = await dart.get_cb_issuance(
    corp_code="...",
    bgn_de="20260101",
    end_de="20260507",
)

Financial indicators

profitability = await dart.get_financial_indicators(
    corp_code="00126380",
    bsns_year="2025",
    reprt_code="11011",
    idx_cl_code="M210000",  # Profitability
)

idx_cl_code: M210000 profitability / M220000 stability / M230000 growth / M240000 activity.

About Alpha Lenz

Alpha Lenz is an AI-powered equity research platform for the Korean stock market (KOSPI · KOSDAQ). We use this library in production to:

• ingest daily DART disclosures across 10,000+ KRX-listed tickers
• monitor convertible bond and treasury-stock activity for our Value-Up tracker
• power the Alpha Lenz AI agent, which answers natural-language questions about Korean equities

If you're building anything around Korean financial data, check out Alpha Lenz — and if you find a bug or want a missing endpoint added to opendart-py, please open an issue. We dogfood this client every day, so PRs and issues get prompt attention.

Development

git clone https://github.com/treasurer-co/opendart-py
cd opendart-py
pip install -e ".[dev]"
pytest

License

MIT — see LICENSE.

See also

• DART OpenAPI official documentation
• pykrx — KRX market data (complementary)
• dart-fss — synchronous DART client (predecessor project)