AAP
CIEN icon

Ardsley Advisory Partners’s Ciena CIEN Stock Holding History

Ardsley Advisory 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
2025
Q3 		– Sell
-110,000
Closed -$8.95M – 146
2025
Q2 		$8.95M Buy
110,000
+10,500
+11% +$753K 1.18% 24
2025
Q1 		$6.01M Buy
99,500
+74,500
+298% +$5.89M 1.15% 26
2024
Q4 		$2.12M Buy
+25,000
New +$1.79M 0.34% 90
2024
Q2 		– Sell
-20,000
Closed -$989K – 147
2024
Q1 		$989K Sell
20,000
-16,000
-44% -$844K 0.14% 94
2023
Q4 		$1.62M Buy
+36,000
New +$1.59M 0.25% 79
2017
Q1 		– Sell
-250,000
Closed -$6.1M – 158
2016
Q4 		$6.1M Buy
+250,000
New +$5.46M 1.01% 35
2016
Q2 		– Sell
-27,500
Closed -$523K – 161
2016
Q1 		$523K Buy
+27,500
New +$508K 0.08% 76
2014
Q4 		– Sell
-437,900
Closed -$7.32M – 196
2014
Q3 		$7.32M Buy
437,900
+403,900
+1,188% +$7.92M 0.97% 31
2014
Q2 		$736K Sell
34,000
-216,000
-86% -$4.44M 0.09% 110
2014
Q1 		$5.68M Buy
+250,000
New +$5.88M 0.85% 37
2013
Q3 		– Sell
-15,000
Closed -$291K – 150
2013
Q2 		$291K Buy
+15,000
New +$250K 0.06% 101

Other funds holding CIEN

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
BNP Paribas Asset Management
BNP Paribas Asset Management Paris, France $99.8B AUM 45.22% 1-Year Est. Return
William Blair Investment Management
William Blair Investment Management Chicago, Illinois $33.3B AUM 44.76% 1-Year Est. Return

Ardsley Advisory Partners's CIEN Position: Q3 2025 in Review

Ardsley Advisory Partners sold out of Ciena (CIEN) in Q3 2025, closing a stake of 110,000 shares — an estimated $8.95M sold.

Ardsley Advisory Partners first reported a position in CIEN in Q2 2013 and held it in 11 quarters. The position peaked at $8.95M in Q2 2025. 689 funds tracked by Wall St. Rank hold CIEN as of Q3 2025.

  • Ardsley Advisory Partners reported no remaining Ciena position as of Q3 2025 after selling out during the quarter.
  • Ardsley Advisory Partners sold 110,000 Ciena shares in Q3 2025, an estimated $8.95M.
  • Ardsley Advisory Partners first reported a position in Ciena in Q2 2013 and held it in 11 quarters.
  • Ardsley Advisory Partners's Ciena position peaked at $8.95M in Q2 2025.
  • 689 funds tracked by Wall St. Rank held Ciena as of Q3 2025.

Based on Ardsley Advisory Partners's 13F filing for Q3 2025, filed 14 Nov 2025.