Sienna Gestion’s Regeneron Pharmaceuticals REGN Stock Holding History

Sienna Gestion’s Portfolio REGN Stock Details REGN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$488K	Sell	764 -735	-49%	-$500K	0.03%	158
2026 Q1	$1.13M	Hold	1,499	–	–	0.07%	118
2025 Q4	$1.15M	Buy	1,499 +1,004	+203%	+$682K	0.07%	137
2025 Q3	$254K	Sell	495 -9,627	-95%	-$5.44M	0.02%	156
2025 Q2	$4.85M	Buy	10,122 +957	+10%	+$534K	0.33%	104
2025 Q1	$5.65M	Sell	9,165 -566	-6%	-$389K	0.46%	81
2024 Q4	$6.93M	Hold	9,731	–	–	0.47%	77
2024 Q3	$10.2M	Buy	9,731 +1,932	+25%	+$2.15M	0.68%	53
2024 Q2	$8.19M	Hold	7,799	–	–	0.73%	45
2024 Q1	$7.51M	Buy	+7,799	New	+$7.42M	0.65%	60

Other funds holding REGN

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Dodge & Cox San Francisco, California $191B AUM 17.5% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Franklin Resources San Mateo, California $462B AUM 39.16% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return

Sienna Gestion's REGN Position: Q2 2026 in Review

Sienna Gestion reduced its Regeneron Pharmaceuticals (REGN) stake by 49% in Q2 2026, selling an estimated $500K and leaving 764 shares worth $488K. The position accounts for 0.03% of the portfolio, ranked #158.

Sienna Gestion first reported a position in REGN in Q1 2024 and has held it in 10 quarters since. The position peaked at $10.2M in Q3 2024. 1,335 funds tracked by Wall St. Rank hold REGN as of Q2 2026.

Sienna Gestion held 764 shares of Regeneron Pharmaceuticals worth $488K as of Q2 2026.
Sienna Gestion sold 735 Regeneron Pharmaceuticals shares in Q2 2026, an estimated $500K.
Regeneron Pharmaceuticals made up 0.03% of Sienna Gestion's portfolio in Q2 2026, its #158 holding.
Sienna Gestion first reported a position in Regeneron Pharmaceuticals in Q1 2024 and has held it in 10 quarters since.
Sienna Gestion's Regeneron Pharmaceuticals position peaked at $10.2M in Q3 2024.
1,335 funds tracked by Wall St. Rank held Regeneron Pharmaceuticals as of Q2 2026.

Based on Sienna Gestion's 13F filing for Q2 2026, filed 13 Aug 2026.