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Mizuho Securities USA’s Biogen BIIB Stock Holding History

Mizuho Securities USA’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 		$2.5M Buy
11,558
+2,686
+30% +$514K 0.04% 379
2026
Q1 		$1.63M Sell
8,872
-1,810
-17% -$334K 0.04% 434
2025
Q4 		$1.95M Buy
10,682
+4
+0% +$653 0.03% 427
2025
Q3 		$1.41M Buy
10,678
+548
+5% +$74.1K 0.03% 509
2025
Q2 		$1.27M Sell
10,130
-1,590
-14% -$198K 0.03% 500
2025
Q1 		$1.6M Sell
11,720
-2,091
-15% -$299K 0.03% 438
2024
Q4 		$2.11M Buy
13,811
+4,366
+46% +$736K 0.04% 401
2024
Q3 		$1.83M Sell
9,445
-1,777
-16% -$372K 0.04% 370
2024
Q2 		$2.6M Buy
+11,222
New +$2.44M 0.06% 314
2016
Q4 		– Sell
-115,200
Closed -$36.1M – 204
2016
Q3 		$36.1M Buy
+115,200
New +$34.1M 3% 6
2015
Q3 		– Sell
-739
Closed -$299K – 132
2015
Q2 		$299K Sell
739
-19,709
-96% -$7.91M 0.04% 148
2015
Q1 		$8.63M Buy
20,448
+13,395
+190% +$5.28M 1.11% 21
2014
Q4 		$2.39M Buy
7,053
+2,939
+71% +$951K 0.24% 65
2014
Q3 		$1.36M Buy
+4,114
New +$1.36M 0.16% 55
2014
Q1 		– Sell
-28,474
Closed -$7.97M – 28
2013
Q4 		$7.97M Buy
28,474
+7,981
+39% +$2.06M 0.66% 37
2013
Q3 		$4.93M Sell
20,493
-3,520
-15% -$788K 0.31% 44
2013
Q2 		$5.17M Buy
+24,013
New +$5.13M 0.26% 42

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

Mizuho Securities USA's BIIB Position: Q2 2026 in Review

Mizuho Securities USA increased its Biogen (BIIB) stake by 30% in Q2 2026, buying an estimated $514K and bringing the position to 11,558 shares worth $2.5M. The position accounts for 0.04% of the portfolio, ranked #379.

Mizuho Securities USA first reported a position in BIIB in Q2 2013 and has held it in 17 quarters since. The position peaked at $36.1M in Q3 2016. 1,036 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Mizuho Securities USA held 11,558 shares of Biogen worth $2.5M as of Q2 2026.
  • Mizuho Securities USA bought 2,686 Biogen shares in Q2 2026, an estimated $514K.
  • Biogen made up 0.04% of Mizuho Securities USA's portfolio in Q2 2026, its #379 holding.
  • Mizuho Securities USA first reported a position in Biogen in Q2 2013 and has held it in 17 quarters since.
  • Mizuho Securities USA's Biogen position peaked at $36.1M in Q3 2016.
  • 1,036 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Mizuho Securities USA's 13F filing for Q2 2026, filed 24 Jul 2026.