Question 1

How many shares of SION does VIKING GLOBAL INVESTORS LP own?

Accepted Answer

As of 2026-Q2, VIKING GLOBAL INVESTORS LP holds 3.2M shares of SION (SIONNA THERAPEUTICS INC).

Question 2

What is VIKING GLOBAL INVESTORS LP's SION position worth?

Accepted Answer

As of 2026-Q2, VIKING GLOBAL INVESTORS LP's SION position is worth $140.6M.

Question 3

When did VIKING GLOBAL INVESTORS LP first buy SION?

Accepted Answer

Based on available 13F filings, VIKING GLOBAL INVESTORS LP first reported a position in SION in 2025-Q1. They have held the position across 6 quarters.

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