Teacher Retirement System of Texas
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Teacher Retirement System of Texas’s Biogen BIIB Stock Holding History

Teacher Retirement System of Texas’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
Q1 		$3.9M Sell
21,299
-2,190
-9% -$404K 0.02% 511
2025
Q4 		$4.13M Sell
23,489
-14,304
-38% -$2.34M 0.01% 535
2025
Q3 		$5.29M Sell
37,793
-3,182
-8% -$430K 0.02% 527
2025
Q2 		$5.15M Buy
40,975
+1,103
+3% +$137K 0.02% 553
2025
Q1 		$5.46M Sell
39,872
-12,285
-24% -$1.76M 0.02% 506
2024
Q4 		$7.98M Buy
52,157
+12,765
+32% +$2.15M 0.03% 391
2024
Q3 		$7.64M Buy
39,392
+5,555
+16% +$1.16M 0.04% 388
2024
Q2 		$7.84M Buy
33,837
+891
+3% +$194K 0.04% 324
2024
Q1 		$7.1M Sell
32,946
-924
-3% -$216K 0.05% 335
2023
Q4 		$8.77M Sell
33,870
-4,442
-12% -$1.09M 0.06% 306
2023
Q3 		$9.85M Buy
38,312
+694
+2% +$186K 0.07% 296
2023
Q2 		$10.7M Buy
37,618
+3,923
+12% +$1.17M 0.07% 280
2023
Q1 		$9.37M Sell
33,695
-29,374
-47% -$8.13M 0.06% 314
2022
Q4 		$17.5M Buy
63,069
+40,391
+178% +$11.4M 0.13% 186
2022
Q3 		$6.05M Sell
22,678
-7,889
-26% -$1.68M 0.04% 371
2022
Q2 		$6.23M Sell
30,567
-7,610
-20% -$1.56M 0.04% 399
2022
Q1 		$8.04M Buy
38,177
+9,428
+33% +$2.05M 0.04% 410
2021
Q4 		$6.9M Buy
28,749
+1,082
+4% +$278K 0.03% 456
2021
Q3 		$7.83M Sell
27,667
-21,837
-44% -$7.16M 0.04% 399
2021
Q2 		$17.1M Buy
49,504
+1,118
+2% +$339K 0.09% 254
2021
Q1 		$13.5M Buy
48,386
+17,093
+55% +$4.61M 0.08% 279
2020
Q4 		$7.66M Sell
31,293
-129,837
-81% -$33.5M 0.05% 370
2020
Q3 		$45.7M Buy
161,130
+19,366
+14% +$5.4M 0.3% 83
2020
Q2 		$37.9M Buy
141,764
+31,551
+29% +$9.48M 0.31% 80
2020
Q1 		$34.9M Sell
110,213
-108,705
-50% -$33M 0.37% 65
2019
Q4 		$65M Buy
218,918
+92,935
+74% +$25.8M 0.51% 48
2019
Q3 		$29.3M Buy
125,983
+21,232
+20% +$4.94M 0.26% 121
2019
Q2 		$24.5M Sell
104,751
-1,976
-2% -$456K 0.2% 161
2019
Q1 		$25.2M Buy
106,727
+24,093
+29% +$7.59M 0.22% 142
2018
Q4 		$24.9M Sell
82,634
-9,087
-10% -$2.9M 0.23% 135
2018
Q3 		$32.4M Sell
91,721
-27,293
-23% -$9.4M 0.23% 128
2018
Q2 		$34.5M Buy
119,014
+40,411
+51% +$11.4M 0.22% 110
2018
Q1 		$21.5M Buy
78,603
+19,301
+33% +$5.99M 0.14% 179
2017
Q4 		$18.9M Sell
59,302
-127,378
-68% -$40.9M 0.13% 194
2017
Q3 		$58.5M Sell
186,680
-22,190
-11% -$6.57M 0.36% 77
2017
Q2 		$56.7M Sell
208,870
-508
-0.2% -$134K 0.39% 75
2017
Q1 		$57.2M Sell
209,378
-7,584
-3% -$2.14M 0.41% 68
2016
Q4 		$61.5M Sell
216,962
-10,890
-5% -$3.23M 0.44% 63
2016
Q3 		$71.3M Sell
227,852
-4,920
-2% -$1.46M 0.5% 53
2016
Q2 		$56.3M Sell
232,772
-31,509
-12% -$8.3M 0.38% 68
2016
Q1 		$68.8M Buy
264,281
+38,702
+17% +$10.2M 0.46% 54
2015
Q4 		$69.1M Sell
225,579
-6,995
-3% -$2.01M 0.5% 56
2015
Q3 		$67.9M Buy
232,574
+61,961
+36% +$20.5M 0.53% 55
2015
Q2 		$68.9M Buy
170,613
+159,871
+1,488% +$64.2M 0.52% 57
2015
Q1 		$4.54M Sell
10,742
-5,774
-35% -$2.28M 0.04% 241
2014
Q4 		$5.61M Buy
16,516
+6,966
+73% +$2.25M 0.04% 192
2014
Q3 		$3.16M Buy
9,550
+2,970
+45% +$979K 0.03% 274
2014
Q2 		$2.08M Buy
6,580
+2,532
+63% +$762K 0.02% 315
2014
Q1 		$1.24M Sell
4,048
-186
-4% -$59K 0.01% 362
2013
Q4 		$1.18M Sell
4,234
-4,502
-52% -$1.16M 0.01% 361
2013
Q3 		$2.1M Buy
8,736
+1,191
+16% +$267K 0.02% 335
2013
Q2 		$1.62M Buy
+7,545
New +$1.61M 0.01% 358

Other funds holding BIIB

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Teacher Retirement System of Texas's BIIB Position: Q1 2026 in Review

Teacher Retirement System of Texas reduced its Biogen (BIIB) stake by 9.3% in Q1 2026, selling an estimated $404K and leaving 21,299 shares worth $3.9M. The position accounts for 0.02% of the portfolio, ranked #511.

Teacher Retirement System of Texas first reported a position in BIIB in Q2 2013 and has held it in 52 quarters since. The position peaked at $71.3M in Q3 2016. 1,008 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Teacher Retirement System of Texas held 21,299 shares of Biogen worth $3.9M as of Q1 2026.
  • Teacher Retirement System of Texas sold 2,190 Biogen shares in Q1 2026, an estimated $404K.
  • Biogen made up 0.02% of Teacher Retirement System of Texas's portfolio in Q1 2026, its #511 holding.
  • Teacher Retirement System of Texas first reported a position in Biogen in Q2 2013 and has held it in 52 quarters since.
  • Teacher Retirement System of Texas's Biogen position peaked at $71.3M in Q3 2016.
  • 1,008 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Teacher Retirement System of Texas's 13F filing for Q1 2026, filed 30 Apr 2026.