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Gilder Gagnon Howe & Co’s Biogen BIIB Stock Holding History

Gilder Gagnon Howe & 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 		$978K Sell
4,528
-30
-0.7% -$5.74K 0.01% 244
2026
Q1 		$836K Buy
+4,558
New +$840K 0.01% 223
2024
Q3 		– Sell
-57,031
Closed -$13.2M – 253
2024
Q2 		$13.2M Sell
57,031
-2,910
-5% -$632K 0.17% 103
2024
Q1 		$12.9M Sell
59,941
-8,538
-12% -$2M 0.16% 109
2023
Q4 		$17.7M Buy
68,479
+901
+1% +$221K 0.24% 94
2023
Q3 		$17.4M Sell
67,578
-12,719
-16% -$3.4M 0.26% 81
2023
Q2 		$22.9M Buy
80,297
+25,885
+48% +$7.71M 0.31% 75
2023
Q1 		$15.1M Sell
54,412
-2,129
-4% -$589K 0.25% 87
2022
Q4 		$15.7M Buy
+56,541
New +$16M 0.29% 87
2021
Q3 		– Sell
-2,794
Closed -$967K – 425
2021
Q2 		$967K Sell
2,794
-3,634
-57% -$1.1M ﹤0.01% 331
2021
Q1 		$1.8M Buy
+6,428
New +$1.73M 0.01% 281
2016
Q4 		– Sell
-177
Closed -$55K – 267
2016
Q3 		$55K Buy
+177
New +$52.4K ﹤0.01% 256
2015
Q3 		– Sell
-1,062
Closed -$429K – 260
2015
Q2 		$429K Sell
1,062
-2
-0.2% -$803 0.01% 234
2015
Q1 		$449K Buy
1,064
+982
+1,198% +$387K 0.01% 224
2014
Q4 		$28K Buy
+82
New +$26.5K ﹤0.01% 266

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

Gilder Gagnon Howe & Co's BIIB Position: Q2 2026 in Review

Gilder Gagnon Howe & Co reduced its Biogen (BIIB) stake by 0.66% in Q2 2026, selling an estimated $5.74K and leaving 4,528 shares worth $978K. The position accounts for 0.01% of the portfolio, ranked #244.

Gilder Gagnon Howe & Co first reported a position in BIIB in Q4 2014 and has held it in 15 quarters since. The position peaked at $22.9M in Q2 2023. 1,038 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Gilder Gagnon Howe & Co held 4,528 shares of Biogen worth $978K as of Q2 2026.
  • Gilder Gagnon Howe & Co sold 30 Biogen shares in Q2 2026, an estimated $5.74K.
  • Biogen made up 0.01% of Gilder Gagnon Howe & Co's portfolio in Q2 2026, its #244 holding.
  • Gilder Gagnon Howe & Co first reported a position in Biogen in Q4 2014 and has held it in 15 quarters since.
  • Gilder Gagnon Howe & Co's Biogen position peaked at $22.9M in Q2 2023.
  • 1,038 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Gilder Gagnon Howe & Co's 13F filing for Q2 2026, filed 14 Aug 2026.