Cohen Klingenstein’s Biogen BIIB Stock Holding History

Cohen Klingenstein’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
2026 Q2	$864K	Hold	4,000	–	–	0.02%	165
2026 Q1	$733K	Hold	4,000	–	–	0.02%	172
2025 Q4	$704K	Hold	4,000	–	–	0.02%	170
2025 Q3	$560K	Hold	4,000	–	–	0.02%	182
2025 Q2	$502K	Hold	4,000	–	–	0.02%	182
2025 Q1	$547K	Hold	4,000	–	–	0.02%	180
2024 Q4	$612K	Hold	4,000	–	–	0.02%	178
2024 Q3	$775K	Hold	4,000	–	–	0.03%	180
2024 Q2	$927K	Hold	4,000	–	–	0.03%	168
2024 Q1	$863K	Hold	4,000	–	–	0.03%	176
2023 Q4	$1.04M	Hold	4,000	–	–	0.04%	167
2023 Q3	$1.03M	Hold	4,000	–	–	0.05%	160
2023 Q2	$1.14M	Hold	4,000	–	–	0.05%	157
2023 Q1	$1.11M	Hold	4,000	–	–	0.05%	156
2022 Q4	$1.11M	Hold	4,000	–	–	0.06%	158
2022 Q3	$1.07M	Hold	4,000	–	–	0.06%	152
2022 Q2	$816K	Hold	4,000	–	–	0.04%	169
2022 Q1	$842K	Hold	4,000	–	–	0.04%	174
2021 Q4	$960K	Hold	4,000	–	–	0.04%	174
2021 Q3	$1.13M	Hold	4,000	–	–	0.05%	168
2021 Q2	$1.39M	Hold	4,000	–	–	0.06%	154
2021 Q1	$1.12M	Hold	4,000	–	–	0.05%	173
2020 Q4	$979K	Hold	4,000	–	–	0.05%	172
2020 Q3	$1.14M	Hold	4,000	–	–	0.06%	152
2020 Q2	$1.07M	Hold	4,000	–	–	0.07%	154
2020 Q1	$1.27M	Hold	4,000	–	–	0.09%	129
2019 Q4	$1.19M	Hold	4,000	–	–	0.07%	149
2019 Q3	$931K	Buy	+4,000	New	+$931K	0.06%	169

Other funds holding BIIB

Pictet Asset Management Carouge, Switzerland $105B AUM 38.07% 1-Year Est. Return

Robeco Institutional Asset Management Rotterdam, Netherlands $81.4B AUM 40.71% 1-Year Est. Return

AIM

Artemis Investment Management Edinburgh, United Kingdom $11.2B AUM 80.72% 1-Year Est. Return

Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return

Swedbank Stockholm, Sweden $116B AUM 46.87% 1-Year Est. Return

AAMU

AEGON Asset Management (UK) Edinburgh, United Kingdom $9.38B AUM 48.94% 1-Year Est. Return

New York State Teachers Retirement System (NYSTRS) Albany, New York $54.2B AUM 43.77% 1-Year Est. Return

ECSS

Eurizon Capital SGR SpA Milan $37.3B AUM

ADEF

Adams Diversified Equity Fund Baltimore, Maryland $3.27B AUM 45.57% 1-Year Est. Return

New York State Common Retirement Fund Albany, New York $79.3B AUM 43.63% 1-Year Est. Return

Cohen Klingenstein's BIIB Position: Q2 2026 in Review

Cohen Klingenstein held its Biogen (BIIB) position steady in Q2 2026 at 4,000 shares worth $864K. The position accounts for 0.02% of the portfolio, ranked #165.

Cohen Klingenstein first reported a position in BIIB in Q3 2019 and has held it in 28 quarters since. The position peaked at $1.39M in Q2 2021. 382 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Cohen Klingenstein held 4,000 shares of Biogen worth $864K as of Q2 2026.
Cohen Klingenstein left its Biogen share count unchanged in Q2 2026.
Biogen made up 0.02% of Cohen Klingenstein's portfolio in Q2 2026, its #165 holding.
Cohen Klingenstein first reported a position in Biogen in Q3 2019 and has held it in 28 quarters since.
Cohen Klingenstein's Biogen position peaked at $1.39M in Q2 2021.
382 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Cohen Klingenstein's 13F filing for Q2 2026, filed 15 Jul 2026.