Robeco Institutional Asset Management’s Ciena CIEN Stock Holding History

Robeco Institutional Asset Management’s Portfolio CIEN Stock Details CIEN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$157M	Buy	319,285 +51,342	+19%	+$26.2M	0.19%	131
2026 Q1	$104M	Buy	267,943 +215,770	+414%	+$66M	0.15%	173
2025 Q4	$12.2M	Buy	52,173 +50,687	+3,411%	+$9.83M	0.02%	404
2025 Q3	$216K	Sell	1,486 -40,811	-96%	-$4.16M	﹤0.01%	845
2025 Q2	$3.44M	Hold	42,297	–	–	0.01%	617
2025 Q1	$2.56M	Hold	42,297	–	–	0.01%	673
2024 Q4	$3.59M	Hold	42,297	–	–	0.01%	610
2024 Q3	$2.61M	Hold	42,297	–	–	0.01%	660
2024 Q2	$2.04M	Buy	+42,297	New	+$2.01M	﹤0.01%	680
2020 Q4	–	Sell	-193,200	Closed	-$7.67M	–	942
2020 Q3	$7.67M	Buy	193,200 +15,502	+9%	+$816K	0.02%	444
2020 Q2	$9.62M	Sell	177,698 -80,617	-31%	-$4.01M	0.03%	424
2020 Q1	$10.3M	Hold	258,315	–	–	0.04%	410
2019 Q4	$11M	Sell	258,315 -85,679	-25%	-$3.26M	0.04%	465
2019 Q3	$13.5M	Sell	343,994 -23,358	-6%	-$979K	0.05%	394
2019 Q2	$15.1M	Sell	367,352 -2,258	-0.6%	-$86.9K	0.05%	385
2019 Q1	$13.8M	Buy	+369,610	New	+$14.4M	0.05%	415

Other funds holding CIEN

Wealth Enhancement Advisory Services Plymouth, Minnesota $59.8B AUM 29.42% 1-Year Est. Return

Assenagon Asset Management Senningerberg, Luxembourg $80.2B AUM 50.57% 1-Year Est. Return

AHT

Amanah Holdings Trust London $1.7B AUM 612.53% 1-Year Est. Return

NGM

North Growth Management Vancouver, British Columbia, Canada $780M AUM 102.77% 1-Year Est. Return

Swedbank Stockholm, Sweden $116B AUM 46.87% 1-Year Est. Return

VNIM

Vaughan Nelson Investment Management Houston, Texas $11.3B AUM 53% 1-Year Est. Return

Handelsbanken Fonder Stockholm, Sweden $35.1B AUM 47.76% 1-Year Est. Return

MLCM

M & L Capital Management London, United Kingdom $370M AUM 165.61% 1-Year Est. Return

Mirae Asset Global Investments Seoul, South Korea $67.7B AUM 51.91% 1-Year Est. Return

LMCG Investments Boston, Massachusetts $1.87B AUM 50.61% 1-Year Est. Return

Robeco Institutional Asset Management's CIEN Position: Q2 2026 in Review

Robeco Institutional Asset Management increased its Ciena (CIEN) stake by 19% in Q2 2026, buying an estimated $26.2M and bringing the position to 319,285 shares worth $157M. The position accounts for 0.19% of the portfolio, ranked #131.

Robeco Institutional Asset Management first reported a position in CIEN in Q1 2019 and has held it in 16 quarters since. 233 funds tracked by Wall St. Rank hold CIEN as of Q2 2026.

Robeco Institutional Asset Management held 319,285 shares of Ciena worth $157M as of Q2 2026.
Robeco Institutional Asset Management bought 51,342 Ciena shares in Q2 2026, an estimated $26.2M.
Ciena made up 0.19% of Robeco Institutional Asset Management's portfolio in Q2 2026, its #131 holding.
Robeco Institutional Asset Management first reported a position in Ciena in Q1 2019 and has held it in 16 quarters since.
233 funds tracked by Wall St. Rank held Ciena as of Q2 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q2 2026, filed 21 Jul 2026.