SEI Investments’s Adtran ADTN Stock Holding History

SEI Investments’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	$5.61M	Sell	403,253 -701,857	-64%	-$11M	﹤0.01%	1446
2026 Q1	$13.9M	Buy	1,105,110 +683,262	+162%	+$6.92M	0.01%	957
2025 Q4	$3.67M	Buy	+421,848	New	+$3.66M	﹤0.01%	1532
2023 Q2	–	Sell	-26,847	Closed	-$426K	–	2667
2023 Q1	$426K	Sell	26,847 -93,822	-78%	-$1.63M	﹤0.01%	2192
2022 Q4	$2.27M	Buy	120,669 +49,190	+69%	+$988K	0.01%	1435
2022 Q3	$1.4M	Buy	+71,479	New	+$1.56M	﹤0.01%	1685
2019 Q4	–	Sell	-14,832	Closed	-$168K	–	2379
2019 Q3	$168K	Hold	14,832	–	–	﹤0.01%	2266
2019 Q2	$226K	Buy	+14,832	New	+$237K	﹤0.01%	2203
2018 Q2	–	Sell	-14	Closed	–	–	3600
2018 Q1	$0	Buy	+14	New	+$234	﹤0.01%	3441
2017 Q3	–	Sell	-2	Closed	–	–	3186
2017 Q2	$0	Buy	+2	New	+$40	﹤0.01%	3046
2015 Q2	–	Sell	-48,808	Closed	-$911K	–	2257
2015 Q1	$911K	Hold	48,808	–	–	0.01%	998
2014 Q4	$1.06M	Buy	+48,808	New	+$1M	0.01%	921

Other funds holding ADTN

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

DnB Asset Management Oslo, Norway $35.7B AUM 27.58% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

SEI Investments's ADTN Position: Q2 2026 in Review

SEI Investments reduced its Adtran (ADTN) stake by 64% in Q2 2026, selling an estimated $11M and leaving 403,253 shares worth $5.61M. The position accounts for ﹤0.01% of the portfolio, ranked #1446.

SEI Investments first reported a position in ADTN in Q4 2014 and has held it in 12 quarters since. The position peaked at $13.9M in Q1 2026. 249 funds tracked by Wall St. Rank hold ADTN as of Q2 2026.

SEI Investments held 403,253 shares of Adtran worth $5.61M as of Q2 2026.
SEI Investments sold 701,857 Adtran shares in Q2 2026, an estimated $11M.
Adtran made up ﹤0.01% of SEI Investments's portfolio in Q2 2026, its #1446 holding.
SEI Investments first reported a position in Adtran in Q4 2014 and has held it in 12 quarters since.
SEI Investments's Adtran position peaked at $13.9M in Q1 2026.
249 funds tracked by Wall St. Rank held Adtran as of Q2 2026.

Based on SEI Investments's 13F filing for Q2 2026, filed 14 Aug 2026.