(주)유에스티21 / UST21 inc

Also known as 유에스티21 · UST21
(주)유에스티21 (UST21 inc) is a Korea-based business registered at Songdo 1-dong (Songdo-dong), Yeonsu-gu, Incheon (Postal code: 21999). It operates as a head office of a for-profit corporation. It was originally registered with the Incheon Tax Office and incorporated at the Incheon District Court, Registry Bureau. (주)유에스티21 (UST21 inc) falls under the Professional, Scientific & Technical Services industry. It operates within the Architectural & Engineering Services sector, specifically focusing on Other engineering services business activities. It has 100–299 employees. According to KOBDi Industry Ranking system, (주)유에스티21 (UST21 inc) scored 140.25 points (down 0.06 points since August 2026) and outperforms approximately 99% of companies in the same industry. Recent performance indicators include: Employee growth: -3.04% (industry average: -2.61%).
(주)유에스티21는 인천광역시 연수구에 있는 기타 엔지니어링 서비스업 기업입니다.
121-**-*393* 1201**-0209***

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인천광역시 연수구 갯벌로 (21999)
Songdo 1-dong (Songdo-dong), Yeonsu-gu, Incheon (21999)
Head office of a for-profit corporation
Professional, Scientific & Technical Services > Architectural & Engineering Services > Other engineering services
September 2026
-3.04%
2025-2026
41.17%
140.25
▼ 0.06 pts (vs. August 2026)
Top 1%
September 2026

UST21 inc's KOBDi Score is 140.25 as of Sep 2026, down 6.26 points since Apr 2025; it rose in 4 and fell in 8 of the 12 monthly updates. Its position has stayed ahead of about 99% of companies in its industry.

A year earlier, in Aug 2025, its score was 146.42 and it was ahead of about 99% of companies in its industry.

Sep 2026140.25ahead of 99%
Aug 2026140.31ahead of 99%
Jul 2026146.44ahead of 99%
Jun 2026146.51ahead of 99%
May 2026146.71ahead of 99%
Apr 2026146.64ahead of 99%
Mar 2026146.50ahead of 99%
Feb 2026146.54ahead of 99%
Dec 2025146.80ahead of 99%
Aug 2025146.42ahead of 99%
Jul 2025146.17ahead of 99%
May 2025146.31ahead of 99%
Apr 2025146.51ahead of 99%

Between 2025 and 2026, the headcount of UST21 inc changed by -3.04%, against an average of -2.61% in its industry. It now has 100–299 employees.

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지구환경측정(주)
JIGU ENV & CON CO.,LTD		 30–49 Top 1%
(주)티이솔루션
TESolution Co., Ltd		 30–49 Top 1%
주식회사 한방
HanBang Co.,Ltd.		 300–499 Top 1%
도원엔지니어링 5–9 Top 1%
에이피랩스 1–4 Top 1%















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인천광역시 연수구 갯벌로 (21999)
Songdo 1-dong (Songdo-dong), Yeonsu-gu, Incheon (21999)
Where is UST21 inc located?

UST21 inc is registered at Songdo 1-dong (Songdo-dong), Yeonsu-gu, Incheon, South Korea (postal code 21999).

What industry is UST21 inc in?

UST21 inc belongs to Professional, Scientific & Technical Services › Architectural & Engineering Services › Other engineering services.

How many employees does UST21 inc have?

UST21 inc has 100–299 employees.

What is UST21 inc's KOBDi Score?

140.25 as of September 2026, ahead of about 99% of companies in its industry.

Who are UST21 inc's competitors?

Similar companies include JIGU ENV & CON, TESolution and HanBang.

Which businesses are near UST21 inc?

Businesses registered at the same postal code (21999) include DAEGYUM ENG CP, MINI ROBOT and BENTEKDMC. Most work in application software development and supply, other humanities and social science research and development and management consulting business.

Businesses near UST21 inc

Registered at postal code 21999 (갯벌로, 연수구). Most businesses here work in application software development and supply, other humanities and social science research and development and management consulting business.

Other other engineering services companies in 연수구

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