William Blair Investment Management
ADTN icon

William Blair Investment Management’s Adtran ADTN Stock Holding History

William Blair Investment Management’s Portfolio ADTN Stock Details ADTN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$15.3M Sell
1,099,019
-890,511
-45% -$13.9M 0.05% 279
2026
Q1 		$25M Sell
1,989,530
-489,091
-20% -$4.96M 0.08% 225
2025
Q4 		$21.5M Sell
2,478,621
-257,809
-9% -$2.24M 0.06% 264
2025
Q3 		$25.7M Sell
2,736,430
-166,096
-6% -$1.55M 0.07% 255
2025
Q2 		$26M Sell
2,902,526
-236,577
-8% -$1.89M 0.07% 248
2025
Q1 		$27.4M Sell
3,139,103
-1,508,052
-32% -$15.2M 0.08% 235
2024
Q4 		$38.7M Buy
4,647,155
+114,986
+3% +$849K 0.09% 182
2024
Q3 		$26.9M Buy
4,532,169
+94,982
+2% +$529K 0.07% 262
2024
Q2 		$23.3M Sell
4,437,187
-18,880
-0.4% -$96.2K 0.06% 282
2024
Q1 		$24.2M Buy
4,456,067
+817,762
+22% +$5.22M 0.06% 284
2023
Q4 		$26.7M Buy
3,638,305
+1,232,466
+51% +$8.12M 0.08% 252
2023
Q3 		$19.8M Buy
2,405,839
+875,140
+57% +$7.78M 0.07% 276
2023
Q2 		$16.1M Buy
+1,530,699
New +$15.2M 0.05% 297
2018
Q1 		– Sell
-1,018,565
Closed -$19.7M – 433
2017
Q4 		$19.7M Sell
1,018,565
-10,820
-1% -$240K 0.08% 247
2017
Q3 		$24.7M Buy
1,029,385
+176,356
+21% +$3.9M 0.09% 212
2017
Q2 		$17.6M Buy
853,029
+190,309
+29% +$3.81M 0.06% 267
2017
Q1 		$13.8M Sell
662,720
-2,685
-0.4% -$58.3K 0.05% 289
2016
Q4 		$14.9M Buy
665,405
+53
+0% +$1.07K 0.06% 274
2016
Q3 		$12.7M Buy
665,352
+74,201
+13% +$1.37M 0.05% 289
2016
Q2 		$11M Buy
591,151
+78,345
+15% +$1.49M 0.04% 287
2016
Q1 		$10.4M Buy
+512,806
New +$9.48M 0.04% 282

Other funds holding ADTN

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
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
RA
Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
DnB Asset Management
DnB Asset Management Oslo, Norway $35.7B AUM 27.58% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

William Blair Investment Management's ADTN Position: Q2 2026 in Review

William Blair Investment Management reduced its Adtran (ADTN) stake by 45% in Q2 2026, selling an estimated $13.9M and leaving 1,099,019 shares worth $15.3M. The position accounts for 0.05% of the portfolio, ranked #279.

William Blair Investment Management first reported a position in ADTN in Q1 2016 and has held it in 21 quarters since. The position peaked at $38.7M in Q4 2024. 249 funds tracked by Wall St. Rank hold ADTN as of Q2 2026.

  • William Blair Investment Management held 1,099,019 shares of Adtran worth $15.3M as of Q2 2026.
  • William Blair Investment Management sold 890,511 Adtran shares in Q2 2026, an estimated $13.9M.
  • Adtran made up 0.05% of William Blair Investment Management's portfolio in Q2 2026, its #279 holding.
  • William Blair Investment Management first reported a position in Adtran in Q1 2016 and has held it in 21 quarters since.
  • William Blair Investment Management's Adtran position peaked at $38.7M in Q4 2024.
  • 249 funds tracked by Wall St. Rank held Adtran as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.