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Klingenstein Fields & Co’s Biogen BIIB Stock Holding History

Klingenstein Fields & Co’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 		$590K Hold
2,731
– – 0.02% 126
2026
Q1 		$501K Hold
2,731
– – 0.02% 125
2025
Q4 		$481K Hold
2,731
– – 0.02% 124
2025
Q3 		$383K Hold
2,731
– – 0.01% 137
2025
Q2 		$343K Hold
2,731
– – 0.01% 139
2025
Q1 		$374K Hold
2,731
– – 0.02% 128
2024
Q4 		$418K Sell
2,731
-225
-8% -$38K 0.02% 125
2024
Q3 		$573K Sell
2,956
-100
-3% -$20.9K 0.02% 117
2024
Q2 		$708K Sell
3,056
-75
-2% -$16.3K 0.03% 105
2024
Q1 		$675K Sell
3,131
-12
-0.4% -$2.81K 0.03% 109
2023
Q4 		$813K Hold
3,143
– – 0.04% 100
2023
Q3 		$808K Buy
3,143
+1,318
+72% +$353K 0.04% 97
2023
Q2 		$520K Buy
1,825
+255
+16% +$75.9K 0.02% 111
2023
Q1 		$437K Hold
1,570
– – 0.02% 117
2022
Q4 		$435K Hold
1,570
– – 0.02% 123
2022
Q3 		$419K Buy
+1,570
New +$333K 0.02% 124
2017
Q3 		– Sell
-60,947
Closed -$16.5M – 218
2017
Q2 		$16.5M Sell
60,947
-899
-1% -$238K 0.65% 49
2017
Q1 		$16.9M Buy
61,846
+90
+0.1% +$25.4K 0.69% 49
2016
Q4 		$17.5M Buy
61,756
+3,780
+7% +$1.12M 0.77% 46
2016
Q3 		$18.1M Buy
57,976
+72
+0.1% +$21.3K 0.84% 45
2016
Q2 		$14M Buy
57,904
+2,986
+5% +$787K 0.65% 46
2016
Q1 		$14.3M Buy
54,918
+1,832
+3% +$484K 0.72% 45
2015
Q4 		$16.3M Sell
53,086
-232
-0.4% -$66.7K 0.81% 44
2015
Q3 		$15.6M Buy
+53,318
New +$17.6M 0.77% 48

Other funds holding BIIB

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Klingenstein Fields & Co's BIIB Position: Q2 2026 in Review

Klingenstein Fields & Co held its Biogen (BIIB) position steady in Q2 2026 at 2,731 shares worth $590K. The position accounts for 0.02% of the portfolio, ranked #126.

Klingenstein Fields & Co first reported a position in BIIB in Q3 2015 and has held it in 24 quarters since. The position peaked at $18.1M in Q3 2016. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Klingenstein Fields & Co held 2,731 shares of Biogen worth $590K as of Q2 2026.
  • Klingenstein Fields & Co left its Biogen share count unchanged in Q2 2026.
  • Biogen made up 0.02% of Klingenstein Fields & Co's portfolio in Q2 2026, its #126 holding.
  • Klingenstein Fields & Co first reported a position in Biogen in Q3 2015 and has held it in 24 quarters since.
  • Klingenstein Fields & Co's Biogen position peaked at $18.1M in Q3 2016.
  • 1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Klingenstein Fields & Co's 13F filing for Q2 2026, filed 5 Aug 2026.