Question 1

Does Viking Global Investors own SION stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Viking Global Investors holds 3,195,181 shares of SION (Sionna Therapeutics), worth $140.6M.

Question 2

How many shares of SION does Viking Global Investors own?

Accepted Answer

As of its Q2 2026 13F, Viking Global Investors holds 3,195,181 shares of SION (Sionna Therapeutics).

Question 3

What is Viking Global Investors' SION position worth?

Accepted Answer

As of its Q2 2026 13F, Viking Global Investors' SION position is worth $140.6M.

Question 4

When did Viking Global Investors first buy SION?

Accepted Answer

Viking Global Investors already held SION in its Q1 2025 13F, the earliest on record, and has listed it in 6 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Unchanged	3.2M	0.0%	$140.6M	0.4%	$43.99	0
2026-Q1	Unchanged	3.2M	0.0%	$128.1M	0.4%	$34.09	0
2025-Q4	Unchanged	3.2M	0.0%	$131.4M	0.3%	$41.39	0
2025-Q3	Unchanged	3.2M	0.0%	$94M	0.2%	$29.52	0
2025-Q2	Increased	3.2M	+8.2%	$55.4M	0.2%	$15.84	38
2025-Q1	New	3M	—	$30.9M	0.1%	$11.56	40