Question 1

Does Grantham, Mayo, Van Otterloo own CIEN stock?

Accepted Answer

No. Grantham, Mayo, Van Otterloo exited its CIEN (Ciena) position in Q2 2025. Its Q1 2025 13F listed 252,853 shares worth $15.3M.

Question 2

How many shares of CIEN does Grantham, Mayo, Van Otterloo own?

Accepted Answer

None since Q2 2025, when Grantham, Mayo, Van Otterloo exited the position. Its Q1 2025 13F listed 252,853 shares worth $15.3M.

Question 3

What is Grantham, Mayo, Van Otterloo's CIEN position worth?

Accepted Answer

Grantham, Mayo, Van Otterloo's CIEN position was worth $15.3M in its Q1 2025 13F, before the exit in Q2 2025.

Question 4

Is Grantham, Mayo, Van Otterloo buying or selling CIEN?

Accepted Answer

In Q2 2025, Grantham, Mayo, Van Otterloo exited its entire CIEN position.

Question 5

When did Grantham, Mayo, Van Otterloo first buy CIEN?

Accepted Answer

Grantham, Mayo, Van Otterloo already held CIEN in its Q4 2018 13F, the earliest on record, and listed it in 22 quarterly 13F filings.

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