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 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

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

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

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

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

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

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

CenterBook Partners's CIEN Position: Q2 2026 in Review

CenterBook Partners opened a new position in Ciena (CIEN) in Q2 2026: 3,129 shares worth $1.53M. The stake represents 0.08% of the portfolio and ranks #282 among its holdings. This is a return to the name: CenterBook Partners previously reported a position in CIEN as recently as Q4 2024.

CenterBook Partners first reported a position in CIEN in Q4 2021 and has held it in 13 quarters since. The position peaked at $7.93M in Q1 2024. 1,226 funds tracked by Wall St. Rank hold CIEN as of Q2 2026.

CenterBook Partners held 3,129 shares of Ciena worth $1.53M as of Q2 2026.
Ciena was a new CenterBook Partners position in Q2 2026.
Ciena made up 0.08% of CenterBook Partners's portfolio in Q2 2026, its #282 holding.
CenterBook Partners first reported a position in Ciena in Q4 2021 and has held it in 13 quarters since.
CenterBook Partners's Ciena position peaked at $7.93M in Q1 2024.
1,226 funds tracked by Wall St. Rank held Ciena as of Q2 2026.

Based on CenterBook Partners's 13F filing for Q2 2026, filed 11 Aug 2026.