Certificates of management systems
| Company | Certificate | Status |
|---|---|---|
| Yoosung Precision Co. | ISO 9001:2008 | expired |
| YOOYANG SPECIAL IND CO., LTD. | ISO 14001:2004 | expired |
| YOOYANG SPECIAL IND CO., LTD. | ISO 9001:2008 | expired |
| YOSSHI HUAMAN HILARES | ISO 14001:2015 | valid |
| YOSSHI HUAMAN HILARES | ISO 37001:2016 | valid |
| YOSSHI HUAMAN HILARES | ISO 45001:2018 | valid |
| YOUNG JIN CO., LTD. | ISO 9001:2000 | withdrawn |
| YOUNGKWANG MECHANICAL | ISO 14001:1996 | withdrawn |
| YOUNGKWANG MECHANICAL | ISO 9001:2000 | withdrawn |
| YSSEL HOLCON s.r.o. | ISO 9001:2015 | valid |
| YSW CO., LTD. | ISO 14001:2004 | withdrawn |
| YTAB Kft. | ISO 9001:2015 | valid |
| YTAB Kft. | ISO 14001:2015 | valid |
| Yunus Enterprises | ISO 45001:2018 | valid |
| Yunus Enterprises | ISO 14001:2015 | valid |
| Yunus Enterprises | ISO 9001:2015 | valid |
| YUNUS PRES DÖKÜM SU ARMATÜRLERI SANAYI VE TICARET LIMITED ŞIRKETI | ISO 9001:2008 | withdrawn |
| YUPTON INGENIERIA & CONSTRUCCION S.R.L | ISO 45001:2018 | withdrawn |
| YUPTON INGENIERIA & CONSTRUCCION S.R.L | ISO 37001:2016 | withdrawn |
| YUPTON INGENIERIA & CONSTRUCCION S.R.L | ISO 14001:2015 | withdrawn |