MADRID--German carrier Deutsche Lufthansa AG (LHA.XE) and French bank Societe Generale SA (GLE.FR) sold stakes in travel-technology company Amadeus IT Holding SA (AMS.MC) for 448.6 million euros ($570 million), as airlines seek to secure cash to offset volatile fuel costs and cut-throat competition in Europe.

HSBC, the bank involved in the transaction, said in a filing with the Spanish market supervisor on Wednesday that more than 23.6 million shares in Amadeus were sold at EUR19 each. The package represents a combined stake of close to 5.3% in the Madrid-based company.

HSBC said Lufthansa sold more than 16.17 million shares in Amadeus, representing a 3.61% stake.

Air France-KLM (AF.FR), a key Amadeus shareholder, previously conducted a derivatives transaction with Societe Generale SA on a package of Amadeus shares. The French bank then sold on Wednesday more than 7.44 million shares, or a 1.66% stake in the company.

Amadeus shares in morning trading were down 1.6% at EUR19.04. Trading of the company's shares was suspended earlier in the session, ahead of the release of the transaction's details. Amadeus has a market value of about EUR8.5 billion and 448 million shares outstanding.

Iberia, the Spanish wing of International Consolidated Airlines Group (IAG.LN) and an Amadeus shareholder, also conducted a derivatives transaction with Amadeus shares earlier this year to protect the value of its investment amid weak domestic demand in Spain.

Air France also has sold Amadeus shares earlier this year. The French carrier had a 7.7% stake in Amadeus, according to the latest regulatory records.

Lufthansa, which had 7.61% of the Madrid-based company, said late Tuesday it will transfer the rest of the shares it owns in the company to its pension fund unit.

Write to Santiago Perez at santiago.perez@dowjones.com

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