CenterBook Partners’s Ciena CIEN Stock Holding History

CenterBook Partners’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 Q3	$6.68M	Buy	18,998 +15,869	+507%	+$6.12M	0.31%	85
2026 Q2	$1.53M	Buy	+3,129	New	+$1.6M	0.08%	282
2025 Q1	–	Sell	-13,896	Closed	-$1.18M	–	488
2024 Q4	$1.18M	Sell	13,896 -5,408	-28%	-$388K	0.07%	308
2024 Q3	$1.19M	Sell	19,304 -87,816	-82%	-$4.63M	0.07%	277
2024 Q2	$5.16M	Sell	107,120 -53,161	-33%	-$2.52M	0.32%	112
2024 Q1	$7.93M	Buy	160,281 +46,675	+41%	+$2.46M	0.55%	38
2023 Q4	$5.11M	Buy	113,606 +46,636	+70%	+$2.06M	0.62%	32
2023 Q3	$3.17M	Sell	66,970 -44,556	-40%	-$1.96M	0.39%	74
2023 Q2	$4.74M	Buy	111,526 +90,408	+428%	+$4.12M	0.59%	36
2023 Q1	$1.11M	Sell	21,118 -12,902	-38%	-$644K	0.16%	219
2022 Q4	$1.73M	Sell	34,020 -32,849	-49%	-$1.49M	0.29%	124
2022 Q3	$2.7M	Buy	66,869 +17,046	+34%	+$819K	0.52%	43
2022 Q2	$2.28M	Buy	+49,823	New	+$2.58M	0.49%	50
2022 Q1	–	Sell	-6,724	Closed	-$518K	–	351
2021 Q4	$518K	Buy	+6,724	New	+$415K	0.3%	129

Other funds holding CIEN

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return

Amundi Paris, France $496B AUM 35.36% 1-Year Est. Return

Deutsche Bank Frankfurt Am Main Ge, Germany $362B AUM 34.89% 1-Year Est. Return

Pictet Asset Management Carouge, Switzerland $106B AUM 32.76% 1-Year Est. Return

Wealth Enhancement Advisory Services Plymouth, Minnesota $67.3B AUM 21.9% 1-Year Est. Return

Citigroup New York $308B AUM 40.94% 1-Year Est. Return

Mitsubishi UFJ Asset Management Tokyo, Japan $194B AUM 32.2% 1-Year Est. Return

Robeco Institutional Asset Management Rotterdam, Netherlands $83.2B AUM 35.34% 1-Year Est. Return

CenterBook Partners's CIEN Position: Q3 2026 in Review

CenterBook Partners increased its Ciena (CIEN) stake by 507% in Q3 2026, buying an estimated $6.12M and bringing the position to 18,998 shares worth $6.68M. The position accounts for 0.31% of the portfolio, ranked #85.

CenterBook Partners first reported a position in CIEN in Q4 2021 and has held it in 14 quarters since. The position peaked at $7.93M in Q1 2024. 548 funds tracked by Wall St. Rank hold CIEN as of Q3 2026.

CenterBook Partners held 18,998 shares of Ciena worth $6.68M as of Q3 2026.
CenterBook Partners bought 15,869 Ciena shares in Q3 2026, an estimated $6.12M.
Ciena made up 0.31% of CenterBook Partners's portfolio in Q3 2026, its #85 holding.
CenterBook Partners first reported a position in Ciena in Q4 2021 and has held it in 14 quarters since.
CenterBook Partners's Ciena position peaked at $7.93M in Q1 2024.
548 funds tracked by Wall St. Rank held Ciena as of Q3 2026.

Based on CenterBook Partners's 13F filing for Q3 2026, filed 2 Nov 2026.