Andreas Halvorsen's SION Position Overview
Andreas Halvorsen (via Viking Global Investors Lp) currently holds 3.2 M shares of Sionna Therapeutics, Inc. (SION) worth $131.45 M, representing 0.35% of the portfolio. First purchased in 2025-Q1, this short-term holding has been held for 4 quarters.
Based on 13F filings, Andreas Halvorsen has maintained this position in SION for several quarters, showing initial confidence in the investment. Largest addition occurred in Q2 2025, adding 242,427 shares.
Analysis based on 13F filings available since 2013 Q2
Andreas Halvorsen's Sionna Therapeutics (SION) Holding Value Over Time
Track share changes against reported price movement
Quarterly Sionna Therapeutics (SION) Trades by Andreas Halvorsen
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q2 2025 | +242,427 | Add 8.21% | 3.2 M | $17.35 |
| Q1 2025 | +2.95 M | New Buy | 2.95 M | $10.46 |
Andreas Halvorsen's Sionna Therapeutics Investment FAQs
Andreas Halvorsen first purchased Sionna Therapeutics, Inc. (SION) in Q1 2025, acquiring 2,952,754 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Andreas Halvorsen has held Sionna Therapeutics, Inc. (SION) for 4 quarters since Q1 2025.
Andreas Halvorsen's largest addition to Sionna Therapeutics, Inc. (SION) was in Q1 2025, adding 2,952,754 shares worth $30.89 M.
According to the latest 13F filing for Q4 2025, Andreas Halvorsen's firm, Viking Global Investors Lp, owns 3,195,181 shares of Sionna Therapeutics, Inc. (SION), valued at approximately $131.45 M.
As of the Q4 2025 filing, Sionna Therapeutics, Inc. (SION) represents approximately 0.35% of Andreas Halvorsen's publicly disclosed stock portfolio, making it one of their key holdings.
Andreas Halvorsen's peak holding in Sionna Therapeutics, Inc. (SION) was 3,195,181 shares, as reported at the end of Q2 2025.