Question 1

How many shares of CIEN does Grantham, Mayo, Van Otterloo & Co. LLC own?

Accepted Answer

Grantham, Mayo, Van Otterloo & Co. LLC previously held 0 shares of CIEN (CIENA CORP) before exiting the position in 2025-Q2.

Question 2

What is Grantham, Mayo, Van Otterloo & Co. LLC's CIEN position worth?

Accepted Answer

Grantham, Mayo, Van Otterloo & Co. LLC's CIEN position was last reported at $0 in 2025-Q2 before the exit.

Question 3

Is Grantham, Mayo, Van Otterloo & Co. LLC buying or selling CIEN?

Accepted Answer

In 2025-Q2, Grantham, Mayo, Van Otterloo & Co. LLC exited their CIEN position entirely (-100.0% change in shares).

Question 4

When did Grantham, Mayo, Van Otterloo & Co. LLC first buy CIEN?

Accepted Answer

Based on available 13F filings, Grantham, Mayo, Van Otterloo & Co. LLC first reported a position in CIEN in 2024-Q3. They have held the position across 25 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2025-Q2 Latest	Exited	0	-100.0%	$0	0.0%	$81.33	0
2025-Q1	Decreased	252,853	-53.5%	$15.3M	0.0%	$60.43	0
2024-Q4	Decreased	543,556	-17.4%	$46.1M	0.1%	$84.81	0
2024-Q3	Increased	657,763	+9.1%	$40.5M	0.1%	$61.59	38