Jan 17 (Reuters) -

* SIONNA THERAPEUTICS INC - FILES FOR INITIAL PUBLIC

OFFERING

* SIONNA THERAPEUTICS INC - APPLIES TO LIST ON NASDAQ UNDER

SYMBOL

'SION'

* SIONNA THERAPEUTICS INC SAYS ENTITIES AFFILIATED WITH

ATLAS

VENTURE BENEFICIALLY OWNED 11.4% OF SHARES PRIOR TO OFFERING

* SIONNA THERAPEUTICS INC SAYS GOLDMAN SACHS & CO. LLC, TD

COWEN,

STIFEL & GUGGENHEIM SECURITIES ARE THE UNDERWRITERS TO IPO

* SIONNA THERAPEUTICS INC SAYS ENTITIES AFFILIATED WITH RA

CAPITAL

BENEFICIALLY OWNED 29.2% OF SHARES PRIOR TO OFFERING

* SIONNA THERAPEUTICS INC SAYS ENTITIES AFFILIATED WITH TPG

GROWTH

BENEFICIALLY OWNED 17.4% OF SHARES PRIOR TO OFFERING

* SIONNA THERAPEUTICS INC SAYS ENTITIES AFFILIATED WITH

VIKING

GLOBAL OPPORTUNITIES BENEFICIALLY OWNED 5.5% OF SHARES PRIOR TO

OFFERING

* SIONNA THERAPEUTICS INC SAYS ORBIMED PRIVATE INVESTMENTS

VIII,

LP BENEFICIALLY OWNED 9.9% OF SHARES PRIOR TO OFFERING

* SIONNA THERAPEUTICS INC SAYS SIONNA AGGREGATOR, LP

BENEFICIALLY

OWNED 6.0% OF SHARES PRIOR TO OFFERING

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