The strategy is managed by Geneva-based fund manager Atlanticomnium, which has managed assets for the Swiss fund house since 1985 as delegate investment adviser.
The fund's objective is to generate a steady high income from bonds of predominantly investment grade companies, with a focus on junior or subordinated debt in a bid to capture higher yields.
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Miginiac, who has worked at Atlanticomnium since 2018, is the firm's head of research and also manages the GAM Sustainable Climate Bond strategy.
Prior to joining the firm, he worked at Aberdeen Standard Investments as a credit analyst covering European financial institutions for two years. He has also held positions with KPMG and UBS in financial services audit and wealth management, respectively.
Smouha, co-manager and Atlanticomnium CEO, said Miginiac has given "invaluable insight" into the firm's strategies, where he said the return potential is now "the most attractive it has been for many years".
"Romain's new role represents our continued aim to deliver excellent performance for our clients," he said.
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Miginiac added: "I am delighted to take on the responsibility of fund manager for the GAM Star Credit Opportunities strategy. I look forward to co-managing the strategy, which has one of the longest track records within subordinated debt, alongside a team of experienced individuals.
"This comes at an exciting time, given both the extraordinary double-digit yields on the strategy but also the opportunity to take part in GAM's new journey."