Calamos Advisors
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Calamos Advisors’s Biogen BIIB Stock Holding History

Calamos Advisors’s Portfolio BIIB Stock Details BIIB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2020
Q1 		– Sell
-26,200
Closed -$7.77M – 713
2019
Q4 		$7.77M Buy
+26,200
New +$7.27M 0.04% 415
2018
Q4 		– Sell
-37,900
Closed -$13.4M – 675
2018
Q3 		$13.4M Buy
+37,900
New +$13M 0.07% 280
2015
Q3 		– Sell
-1,078
Closed -$2.46M – 680
2015
Q2 		$2.46M Sell
1,078
-105
-9% -$42.1K 0.02% 455
2015
Q1 		$3.38M Buy
+1,183
New +$466K 0.02% 427

Other funds holding BIIB

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 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
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Calamos Advisors's BIIB Position: Q1 2026 in Review

Calamos Advisors held its Biogen (BIIB) position steady in Q1 2026 at 35,527 shares worth $6.51M. The position accounts for 0.02% of the portfolio, ranked #502.

Calamos Advisors first reported a position in BIIB in Q2 2013 and has held it in 52 quarters since. The position peaked at $125M in Q2 2015. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Calamos Advisors held 35,527 shares of Biogen worth $6.51M as of Q1 2026.
  • Calamos Advisors left its Biogen share count unchanged in Q1 2026.
  • Biogen made up 0.02% of Calamos Advisors's portfolio in Q1 2026, its #502 holding.
  • Calamos Advisors first reported a position in Biogen in Q2 2013 and has held it in 52 quarters since.
  • Calamos Advisors's Biogen position peaked at $125M in Q2 2015.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Calamos Advisors's 13F filing for Q1 2026, filed 4 May 2026.