Stephen Mandel’s Ciena CIEN Stock Holding History

Stephen Mandel’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	–	Sell	-809,522	Closed	-$314M	–	38
2026 Q1	$314M	Buy	+809,522	New	+$248M	2.51%	22
2025 Q4	–	Sell	-2,006,662	Closed	-$292M	–	33
2025 Q3	$292M	Buy	+2,006,662	New	+$204M	2.13%	23

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

Stephen Mandel's CIEN Position: Q2 2026 in Review

Stephen Mandel sold out of Ciena (CIEN) in Q2 2026, closing a stake of 809,522 shares — an estimated $314M sold.

Stephen Mandel first reported a position in CIEN in Q3 2025 and held it in 2 quarters. The position peaked at $314M in Q1 2026. 1,217 funds tracked by Wall St. Rank hold CIEN as of Q2 2026.

Stephen Mandel reported no remaining Ciena position as of Q2 2026 after selling out during the quarter.
Stephen Mandel sold 809,522 Ciena shares in Q2 2026, an estimated $314M.
Stephen Mandel first reported a position in Ciena in Q3 2025 and held it in 2 quarters.
Stephen Mandel's Ciena position peaked at $314M in Q1 2026.
1,217 funds tracked by Wall St. Rank held Ciena as of Q2 2026.

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