Constellation Oil Services Strengthens Investor Profile Through Uplisting from Euronext Growth Oslo to Euronext Oslo Børs

Caption: Rodrigo Ribeir, CEO of Constellation Oil Services, rang the bell this morning with colleagues to celebrate the uplisting of the company to Euronext Oslo Børs. The company was welcomed by Øivind Amundsen, CEO of Euronext Oslo Børs. (Photo: Thomas Brun | NTB)

(IN BRIEF) Constellation Oil Services Holding S.A. has uplisted from Euronext Growth Oslo to Euronext Oslo Børs under the ticker code COSH, with a market capitalisation of approximately NOK 11.99 billion on its first day of trading. The company originally listed on Euronext Growth Oslo in March 2025 and has now moved to the main Oslo market after 14 months, marking the 24th listing on Euronext in 2026 and the 10th international admission this year. Constellation is a leading offshore oil and gas drilling services provider in Brazil, holding around one-fifth of the country’s offshore drilling market. With about 2,000 employees and a 46-year track record, the company operates in one of the largest and fastest-growing offshore drilling markets in the world. CEO Rodrigo Ribeir said the uplisting reflects Constellation’s progress in increasing visibility, deepening investor engagement, and demonstrating the resilience of its business, supported by long-term contracts, operational experience, and Brazil’s offshore sector growth cycle.

(PRESS RELEASE) OSLO, 26-May-2026 — /EuropaWire/ — Euronext has congratulated Constellation Oil Services Holding S.A. on its uplisting from Euronext Growth Oslo to Euronext Oslo Børs, marking another milestone for the company following its initial listing on Euronext Growth in March 2025.

Trading in Constellation Oil Services Holding S.A. began on Euronext Oslo Børs under the ticker code COSH. The uplisting represents the 24th listing on Euronext in 2026 and the 10th international admission across Euronext markets so far this year.

Constellation is a leading provider of offshore oil and gas drilling services in Brazil, where it holds approximately one-fifth of the country’s offshore drilling market. With around 2,000 employees and a 46-year operating history, the company has developed a strong position in Brazil’s offshore energy sector, one of the largest and fastest-growing offshore drilling markets globally.

At the market opening, Constellation’s share price was NOK 142, based on the closing price on Euronext Growth Oslo on 22 May 2026. This gave the company a market capitalisation of approximately NOK 11.99 billion on its first day of trading on Euronext Oslo Børs.

Rodrigo Ribeir, CEO of Constellation, said the uplisting reflects the company’s progress since joining Euronext Growth Oslo in March 2025. “When we listed on Euronext Growth Oslo in March 2025, we committed to increasing visibility, deepening investor engagement and demonstrating the strength and resilience of our business. Fourteen months later, we are delivering on those commitments. Brazil’s offshore sector is experiencing a prolonged growth cycle, and Constellation is well positioned through its long-term contracts, operational track record and experienced team that has successfully navigated every market cycle in our industry. We have built a resilient and sustainable business, focused on delivering consistent growth and solid returns to shareholders, and we remain confident in our ability to continue executing on our strategy,” he said.

To mark the uplisting, Rodrigo Ribeir rang the opening bell with colleagues at Euronext Oslo Børs. The company was welcomed by Øivind Amundsen, CEO of Euronext Oslo Børs.

Euronext is a leading European capital market infrastructure provider, covering the full capital markets value chain, including listing, trading, clearing, settlement, custody, and services for issuers and investors. The group operates MTS, one of Europe’s leading electronic fixed income trading markets, and Nord Pool, the European power market. It also provides clearing and settlement services through Euronext Clearing and Euronext Securities central securities depositories in Denmark, Italy, Norway, and Portugal.

In November 2025, Euronext acquired a majority stake in the Athens Stock Exchange, further expanding its pan-European presence and strengthening its integrated market infrastructure with the addition of an exchange, a central securities depository, and a clearing house.

As of March 2026, Euronext’s regulated exchanges in Belgium, France, Greece, Ireland, Italy, the Netherlands, Norway, and Portugal hosted more than 1,800 listed issuers with a combined market capitalisation of €7 trillion. The group also operates a major blue-chip franchise and the world’s largest centre for debt and fund listings. Euronext serves a broad domestic and international client base and accounts for 29% of European lit equity trading. Its products include equities, foreign exchange, ETFs, bonds, derivatives, commodities, and indices.

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