Company · BELFA · CIK 729580

Bel Fuse Inc /Nj (BELFA) SEC filings and CIK.

BELFA’s SEC Central Index Key (CIK) is 0000729580, or 729580 without leading zeros. The SEC’s ticker file lists it as BEL FUSE INC /NJ. The same CIK also trades as BELFB.

Ticker: BELFA
CIK: 0000729580
Other tickers: BELFB
Insider transactions, Q3 2026: 3

Insider trading

In Q3 2026, insiders at Bel Fuse Inc /Nj reported 3 non-derivative transactions on 3 Forms 3, 4 and 5, including 0 open-market purchases and 3 sales. See every BELFA insider transaction →

Recent filings we observed

No filings for this CIK appear in our current observation window. The full history is available from the filings endpoint below and on SEC.gov.

Get BELFA SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=729580&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/729580" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/729580?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · Bel Fuse Inc /Nj on SEC.gov

Questions

What is BELFA’s CIK number?

BELFA’s SEC Central Index Key (CIK) is 0000729580, or 729580 without leading zeros. The SEC’s ticker file lists it as BEL FUSE INC /NJ. The same CIK also trades as BELFB.

How do I find Bel Fuse Inc /Nj’s 10-K?

Request /api/v1/filings?cik=729580&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/belfa.md

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