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Portolan Capital Management’s Ciena CIEN Stock Holding History

Portolan Capital 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 		$7.49M Sell
15,272
-3,194
-17% -$1.63M 0.28% 97
2026
Q1 		$7.17M Sell
18,466
-38,015
-67% -$11.6M 0.38% 76
2025
Q4 		$13.2M Sell
56,481
-32,305
-36% -$6.27M 0.71% 47
2025
Q3 		$12.9M Buy
+88,786
New +$9.04M 0.7% 51

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
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 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
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Portolan Capital Management's CIEN Position: Q2 2026 in Review

Portolan Capital Management reduced its Ciena (CIEN) stake by 17% in Q2 2026, selling an estimated $1.63M and leaving 15,272 shares worth $7.49M. The position accounts for 0.28% of the portfolio, ranked #97.

Portolan Capital Management first reported a position in CIEN in Q3 2025 and has held it in 4 quarters since. The position peaked at $13.2M in Q4 2025. 1,219 funds tracked by Wall St. Rank hold CIEN as of Q2 2026.

  • Portolan Capital Management held 15,272 shares of Ciena worth $7.49M as of Q2 2026.
  • Portolan Capital Management sold 3,194 Ciena shares in Q2 2026, an estimated $1.63M.
  • Ciena made up 0.28% of Portolan Capital Management's portfolio in Q2 2026, its #97 holding.
  • Portolan Capital Management first reported a position in Ciena in Q3 2025 and has held it in 4 quarters since.
  • Portolan Capital Management's Ciena position peaked at $13.2M in Q4 2025.
  • 1,219 funds tracked by Wall St. Rank held Ciena as of Q2 2026.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.