Ostium d.o.o.

Ostium d.o.o. is a Croatian trading company specialising in fittings, accessories and assembly technology for aluminium (ALU) and PVC window and door joinery. It is headquartered in Split, with a head office at Kukuljevićeva 11 and a warehouse at Markov Put 62. The company describes itself as having longstanding experience in the field of ALU, PVC and glassware, as well as in contracting and project management, and states that its sales of ALU profiles, accessories, machinery and equipment have been operating since 2015. Ostium's core business is wholesale and retail trade in fittings and accessories for ALU and PVC joinery, together with the assembly of accessories and screw machine products. Its product range covers fittings for ALU systems; gaskets for PVC and ALU systems; fittings for door windows such as mullion connectors, stulp covers and handles; distance pads for PVC windows in widths of 30 mm, 34 mm, 40 mm, 45 mm and 48 mm; shutter systems including strap boxes, rounded stoppers, slat hangers, shutter scissors and hinges; shutter tubular motors; bolts and screws including self-drilling, turbo and pan-head screws; and assembly technology such as PU foam, silicones, sealant adhesives and drills. The company positions itself on expertise, reliability, quality of service and speed of delivery, and states that its professional and technical approach to partners allowed it to establish itself in the market and become a respectable firm in a short period. Its customer base is made up of partners in the window, door and façade trades, and its operating market is Croatia. Ostium d.o.o. is a private limited liability company (d.o.o.) registered in Croatia under OIB HR91727552215, with a bank account at Privredna Banka Zagreb d.d. Contact is handled through a mobile number and an email address listed on its website.

Ostium d.o.o. is a Croatian company based in Split that trades in fittings, accessories and assembly technology for aluminium (ALU) and PVC window and door joinery. According to its official website, the company draws on longstanding experience in the field of ALU, PVC and glassware, as well as in contracting and project management. Its sales of ALU profiles, accessories, machinery and equipment are stated to have been operating since 2015. The company's core business is wholesale and retail trade in fittings and accessories for ALU and PVC joinery, together with the assembly of accessories and screw machine products. Over time it has built a product portfolio that spans fittings for ALU systems; gaskets for PVC and ALU systems; fittings for door windows such as mullion connectors, stulp covers and handles; distance pads for PVC windows in several widths; shutter systems including strap boxes, rounded stoppers, slat hangers, shutter scissors and hinges; shutter tubular motors; bolts and screws; and assembly technology such as PU foam, silicones, sealant adhesives and drills. Ostium operates from Split, with a head office at Kukuljevićeva 11 and a warehouse at Markov Put 62. It is registered in Croatia under OIB HR91727552215 and holds a bank account with Privredna Banka Zagreb d.d. The company states that its professional and technical approach to partners allowed it to position them in the market and to become a respectable firm in a very short period of time. It prioritises expertise, reliability, quality in service and speed of delivery. Its market is Croatia, and its customers are partners in the window, door and façade trades.

• 2015

  Sales of ALU profiles, accessories, machinery and equipment begin operating, according to the company's official website.

Wholesale and retail supplier of ALU and PVC joinery fittings, accessories and assembly technology, competing on expertise, reliability, service quality and delivery speed.

• Fittings for ALU systems

  Hardware and fittings for aluminium window and door systems.

• Gaskets for PVC and ALU systems

  Sealing gaskets for PVC and aluminium joinery systems.

• Fittings for door windows

  Includes mullion connectors, stulp covers and handles.

• Distance pads for PVC windows

  Available in widths of 30 mm, 34 mm, 40 mm, 45 mm and 48 mm.

• Shutter systems

  Includes strap boxes, rounded stoppers, slat hangers, shutter scissors and hinges.

• Shutter tubular motors

  Tubular motors for shutter systems.

• Bolts and screws

  Includes screw, self-drilling screws, turbo screws and pan-head screws.

• Assembly technology

  Includes PU foam, silicones, sealant adhesives and drills.

• 2026.10.21

  Reported2026.10.21

  Quantum X announces advisory collaboration with Ostium[3]Quantum X宣布与Ostium开展顾问合作finanznachrichten.de

  Quantum X announced an ongoing strategic advisory collaboration with Ostium, providing advisory support for Ostium’s commercial growth and expansion across global financial markets.

Read more

1. 1Ostium – okovi za prozore i vrataostium.hr
2. 2Ostium d.o.o. – Wikidatawikidata.org
3. 3Quantum X宣布与Ostium开展顾问合作finanznachrichten.de