Sionna Therapeutics Inc (SION) Institutional Investor Snapshot (153 Funds, Q2 2026)

SION ranks #3642 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

SION is a disclosed holding of Andreas Halvorsen (Viking Global Investors), one of the tracked superinvestors on AlphaSMO — it makes up 0.4% of that fund's own 13F portfolio.

SION is a top-conviction position for Enavate Sciences GP, LLC — at 31.6% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in SION belongs to Ra Capital Management, L.p., but the position matters far more to Enavate Sciences GP, LLC, who has 31.6% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

SION is up 3.1% today, and institutions have been net buyers of $161.6M this quarter — today's price move and the underlying institutional flow are pointing the same direction.

SION reported a net loss of $75.3M in its latest fiscal year.

• Not yet profitable — net loss of $75.3M in the latest fiscal year
• Net income declined year over year, from -$61.7M to -$75.3M
• Operating cash flow was negative, using $66.3M in cash
• Current ratio of 20.61x — enough short-term assets to cover short-term liabilities
• Liabilities run 0.06x equity — within a conventional range