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Mather Group’s Biogen BIIB Stock Holding History

Mather Group’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 		$343K Buy
1,588
+54
+4% +$10.3K ﹤0.01% 635
2026
Q1 		$281K Buy
1,534
+252
+20% +$46.4K ﹤0.01% 640
2025
Q4 		$226K Buy
1,282
+380
+42% +$62.1K ﹤0.01% 603
2025
Q3 		$126K Buy
+902
New +$122K ﹤0.01% 724
2025
Q2 		– Sell
-2,767
Closed -$379K – 731
2025
Q1 		$379K Buy
2,767
+1,039
+60% +$149K ﹤0.01% 434
2024
Q4 		$264K Buy
1,728
+1,428
+476% +$241K ﹤0.01% 492
2024
Q3 		$58.2K Sell
300
-923
-75% -$193K ﹤0.01% 852
2024
Q2 		$264K Buy
1,223
+181
+17% +$39.3K ﹤0.01% 559
2024
Q1 		$270K Sell
1,042
-6
-0.6% -$1.41K ﹤0.01% 461
2023
Q4 		$271K Sell
1,048
-115
-10% -$28.2K ﹤0.01% 470
2023
Q3 		$299K Sell
1,163
-474
-29% -$127K 0.01% 439
2023
Q2 		$466K Buy
+1,637
New +$487K 0.01% 361
2021
Q4 		– Sell
-721
Closed -$204K – 391
2021
Q3 		$204K Buy
721
+68
+10% +$22.3K ﹤0.01% 275
2021
Q2 		$226K Sell
653
-82
-11% -$24.8K 0.01% 258
2021
Q1 		$206K Buy
+735
New +$198K 0.01% 255
2020
Q4 		– Sell
-963
Closed -$273K – 253
2020
Q3 		$273K Sell
963
-433
-31% -$121K 0.01% 193
2020
Q2 		$373K Buy
+1,396
New +$420K 0.02% 156

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

Mather Group's BIIB Position: Q2 2026 in Review

Mather Group increased its Biogen (BIIB) stake by 3.5% in Q2 2026, buying an estimated $10.3K and bringing the position to 1,588 shares worth $343K. The position accounts for ﹤0.01% of the portfolio, ranked #635.

Mather Group first reported a position in BIIB in Q2 2020 and has held it in 17 quarters since. The position peaked at $466K in Q2 2023. 1,038 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Mather Group held 1,588 shares of Biogen worth $343K as of Q2 2026.
  • Mather Group bought 54 Biogen shares in Q2 2026, an estimated $10.3K.
  • Biogen made up ﹤0.01% of Mather Group's portfolio in Q2 2026, its #635 holding.
  • Mather Group first reported a position in Biogen in Q2 2020 and has held it in 17 quarters since.
  • Mather Group's Biogen position peaked at $466K in Q2 2023.
  • 1,038 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Mather Group's 13F filing for Q2 2026, filed 27 Jul 2026.