* China's HNA Group blasted by FINMA for rules breach
* Travel-to-finance group criticised for opaque holdings
* HNA Group could face 10 mln Swiss franc penalty (Adds possible fine, background, HNA not available for comment)
By John Miller
ZURICH, Sept 25 (Reuters) - Switzerland's markets supervisor said on Wednesday it will lodge a criminal complaint against Chinese conglomerate HNA Group for an alleged "serious breach" of disclosure rules over a stake it once held in duty free group Dufry.
Swiss officials have previously found fault with disclosures by HNA, whose global expansion added activities ranging from travel to finance, but which has been criticised for its holding structure's opacity. reut.rs/2kZE2Si
"FINMA will be registering a complaint with the Criminal Law Division of the Federal Department of Finance," the markets supervisor said. It said HNA had filed six incorrect reports to the SIX Swiss Exchange between April 2017 and February 2019.
HNA Group did not immediately respond to request for comment. It could face a penalty of up to 10 million Swiss francs ($10 million) under Swiss law.
Several acquisitions of Swiss firms by Chinese companies, including the $43 billion 2017 deal in which ChemChina bought chemicals maker Syngenta, have prompted calls for limits on such takeovers, a proposal rejected by the government.
FINMA said HNA Chairman Feng Chen and former co-Chairman Jian Wang, who died in 2018 after a fall while in France, should have been named as the shareholders behind the stake in Dufry, not the Hainan Province Cihang Foundation, which they founded.
"The actual control situation must be disclosed ... so that the stakeholders in question cannot be concealed through opaque structures and technicalities, as was the case here," FINMA Enforcement Division Chief Patric Eymann said.
The Swiss Federal Department of Finance said it had not yet received the complaint from FINMA and could not comment.
In June, the Hainan Province Cihang Foundation reported to the SIX Swiss Exchange that its stake had fallen below the 3% threshold, down from more than 20% in February 2018.
In a separate 2017 case, Swiss officials found HNA provided "untrue" details during its takeover of airline caterer Gategroup. HNA sold Gategroup this year to RRJ Capital, but still owns Swiss cargo handling company Swissport.
HNA has amassed a network of global holdings ranging from real estate and airlines to banks that have often been divided among opaque entities, including charities, making it difficult for other investors to understand the links.
Since Beijing began cracking down on Chinese conglomerates' rapid debt-fuelled global expansions in 2017, HNA has sold more than $25 billion in assets, Dealogic data and Reuters calculations shows.
Disposals have included big stakes in the Radisson hotel group, Hilton Hotels, property in New York, Sydney, Shanghai, San Francisco and Hong Kong, regional Chinese airlines and half of its stake in Deutsche Bank. ($1 = 0.9858 Swiss francs) (Writing by John Miller in Zurich, reporting by Julie Zhu in Hong Kong; Editing by Michael Shields and Alexander Smith)