STSI headquarters details
- Street address
- 4 Lovinčićeva Ulica
- City
- Zagreb
- State / region
- City of Zagreb
- ZIP / postal code
- 10135
- Country
- Croatia
- Phone
- +385 1 2381 122
- Founded
- 2001
- Website
- stsi.hr
- linkedin.com/company/482708
Location map
Open in Google MapsAll STSI office locations
| City | State / region | Country | Type |
|---|---|---|---|
| Zagreb HQ | City of Zagreb | Croatia | Headquarters |
Showing the headquarters of 7 recorded locations. See every location in GraphIQ →
About STSI
STSI is headquartered in Zagreb, City of Zagreb, Croatia. Founded in 2001, the company has 7 recorded locations across 4+ countries and employs approximately 3,000 people worldwide.
Where is STSI's main office?
STSI's main headquarters office is located at 4 Lovinčićeva Ulica, Zagreb, City of Zagreb 10135, Croatia. This is the company's primary corporate address.
STSI regional offices
Beyond its headquarters in Zagreb, STSI has recorded locations in Croatia, Estonia, France and United Kingdom.
STSI contact information
The main switchboard for STSI headquarters can be reached at +385 1 2381 122. Official website: stsi.hr.
What does STSI do?
STSI offers maintenance, engineering, and performance of investment projects, resulting from technology and resources integration. Unified personal services, technology, and staff that have undergone proper training. Those people's analysis, oil and gas production, refining, marketing, and distribution of those fuels and petroleum-based goods. Engineering disciplines such as mechanical, electrical, civil, and transportation are included.
Frequently asked questions
Where is STSI headquarters?
STSI's headquarters is located at 4 Lovinčićeva Ulica, Zagreb, City of Zagreb 10135, Croatia.
How many offices does STSI have?
GraphIQ records 7 locations for STSI across 4+ countries, as of October 2026.
What is STSI's corporate address?
The corporate headquarters address is 4 Lovinčićeva Ulica, Zagreb, City of Zagreb 10135, Croatia.
When was STSI founded?
STSI was founded in 2001 and employs approximately 3,000 people.
What is STSI's phone number?
The main phone number for STSI headquarters is +385 1 2381 122.
How many employees does STSI have?
STSI has approximately 3,000 employees (GraphIQ estimate, 2026).