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Mark Hillman’s Biogen BIIB Stock Holding History

Mark Hillman’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 		$5.18M Sell
23,993
-5,547
-19% -$1.06M 3.75% 2
2026
Q1 		$5.42M Sell
29,540
-976
-3% -$180K 3.76% 1
2025
Q4 		$5.37M Sell
30,516
-7,838
-20% -$1.28M 3.38% 7
2025
Q3 		$5.37M Sell
38,354
-3,618
-9% -$489K 3.13% 14
2025
Q2 		$5.27M Sell
41,972
-2,053
-5% -$256K 2.88% 17
2025
Q1 		$6.02M Buy
44,025
+959
+2% +$137K 2.96% 18
2024
Q4 		$6.59M Buy
43,066
+7,813
+22% +$1.32M 2.44% 19
2024
Q3 		$6.83M Sell
35,253
-701
-2% -$147K 2.34% 22
2024
Q2 		$8.33M Buy
35,954
+162
+0.5% +$35.2K 2.94% 10
2024
Q1 		$7.72M Buy
35,792
+1,316
+4% +$308K 2.48% 23
2023
Q4 		$8.92M Buy
34,476
+170
+0.5% +$41.8K 3.08% 10
2023
Q3 		$8.82M Buy
34,306
+4,895
+17% +$1.31M 3.39% 2
2023
Q2 		$8.38M Sell
29,411
-125
-0.4% -$37.2K 2.96% 12
2023
Q1 		$8.21M Sell
29,536
-540
-2% -$149K 3.11% 15
2022
Q4 		$8.33M Sell
30,076
-1,678
-5% -$474K 3.27% 10
2022
Q3 		$8.48M Sell
31,754
-11,265
-26% -$2.39M 3.52% 4
2022
Q2 		$8.77M Buy
43,019
+340
+0.8% +$69.5K 3.19% 10
2022
Q1 		$8.99M Buy
42,679
+15,488
+57% +$3.37M 2.85% 16
2021
Q4 		$6.52M Sell
27,191
-1,098
-4% -$282K 2.24% 30
2021
Q3 		$8.01M Buy
28,289
+1,050
+4% +$344K 2.81% 21
2021
Q2 		$9.43M Sell
27,239
-50
-0.2% -$15.1K 3.59% 6
2021
Q1 		$7.63M Buy
27,289
+7,360
+37% +$1.98M 3.35% 14
2020
Q4 		$4.88M Buy
19,929
+292
+1% +$75.3K 2.63% 21
2020
Q3 		$5.57M Buy
19,637
+3,391
+21% +$946K 3.92% 4
2020
Q2 		$4.35M Sell
16,246
-134
-0.8% -$40.3K 3.17% 14
2020
Q1 		$5.18M Sell
16,380
-1,734
-10% -$526K 4.96% 2
2019
Q4 		$5.38M Buy
+18,114
New +$5.03M 3.81% 4

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

Mark Hillman's BIIB Position: Q2 2026 in Review

Mark Hillman reduced its Biogen (BIIB) stake by 19% in Q2 2026, selling an estimated $1.06M and leaving 23,993 shares worth $5.18M. The position accounts for 3.75% of the portfolio, ranked #2.

Mark Hillman first reported a position in BIIB in Q4 2019 and has held it in 27 quarters since. The position peaked at $9.43M in Q2 2021. 1,036 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Mark Hillman held 23,993 shares of Biogen worth $5.18M as of Q2 2026.
  • Mark Hillman sold 5,547 Biogen shares in Q2 2026, an estimated $1.06M.
  • Biogen made up 3.75% of Mark Hillman's portfolio in Q2 2026, its #2 holding.
  • Mark Hillman first reported a position in Biogen in Q4 2019 and has held it in 27 quarters since.
  • Mark Hillman's Biogen position peaked at $9.43M in Q2 2021.
  • 1,036 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Hillman Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.