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REGN icon

CSS LLC’s Regeneron Pharmaceuticals REGN Stock Holding History

CSS LLC’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
Q1 		$904K Buy
1,170
+830
+244% +$635K 0.04% 368
2025
Q4 		$262K Buy
+340
New +$231K 0.01% 715
2025
Q3 		– Sell
-720
Closed -$378K – 1156
2025
Q2 		$378K Buy
720
+40
+6% +$22.3K 0.02% 636
2025
Q1 		$431K Buy
680
+70
+11% +$48.1K 0.02% 527
2024
Q4 		$435K Buy
+610
New +$512K 0.02% 597
2023
Q2 		– Sell
-300
Closed -$247K – 954
2023
Q1 		$247K Sell
300
-200
-40% -$151K 0.02% 492
2022
Q4 		$361K Sell
500
-100
-17% -$73.8K 0.02% 469
2022
Q3 		$413K Hold
600
– – 0.02% 569
2022
Q2 		$355K Hold
600
– – 0.01% 667
2022
Q1 		$419K Sell
600
-200
-25% -$127K 0.02% 657
2021
Q4 		$505K Buy
+800
New +$492K 0.02% 653
2020
Q4 		– Sell
-564
Closed -$316K – 929
2020
Q3 		$316K Sell
564
-335
-37% -$203K 0.01% 498
2020
Q2 		$561K Buy
+899
New +$510K 0.03% 366
2014
Q1 		– Sell
-10,254
Closed -$2.82M – 718
2013
Q4 		$2.82M Buy
+10,254
New +$2.95M 0.14% 153

Other funds holding REGN

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Dodge & Cox
Dodge & Cox San Francisco, California $182B AUM 14.68% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $408B AUM 30.18% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

CSS LLC's REGN Position: Q1 2026 in Review

CSS LLC increased its Regeneron Pharmaceuticals (REGN) stake by 244% in Q1 2026, buying an estimated $635K and bringing the position to 1,170 shares worth $904K. The position accounts for 0.04% of the portfolio, ranked #368.

CSS LLC first reported a position in REGN in Q4 2013 and has held it in 14 quarters since. The position peaked at $2.82M in Q4 2013. 1,392 funds tracked by Wall St. Rank hold REGN as of Q1 2026.

  • CSS LLC held 1,170 shares of Regeneron Pharmaceuticals worth $904K as of Q1 2026.
  • CSS LLC bought 830 Regeneron Pharmaceuticals shares in Q1 2026, an estimated $635K.
  • Regeneron Pharmaceuticals made up 0.04% of CSS LLC's portfolio in Q1 2026, its #368 holding.
  • CSS LLC first reported a position in Regeneron Pharmaceuticals in Q4 2013 and has held it in 14 quarters since.
  • CSS LLC's Regeneron Pharmaceuticals position peaked at $2.82M in Q4 2013.
  • 1,392 funds tracked by Wall St. Rank held Regeneron Pharmaceuticals as of Q1 2026.

Based on CSS LLC's 13F filing for Q1 2026, filed 15 May 2026.