Question 1

Does Two Sigma Investments own CIEN stock?

Accepted Answer

Yes. As of its Q2 2026 13F, Two Sigma Investments holds 9,500 shares of CIEN (Ciena), worth $4.7M.

Question 2

How many shares of CIEN does Two Sigma Investments own?

Accepted Answer

As of its Q2 2026 13F, Two Sigma Investments holds 9,500 shares of CIEN (Ciena).

Question 3

What is Two Sigma Investments' CIEN position worth?

Accepted Answer

As of its Q2 2026 13F, Two Sigma Investments' CIEN position is worth $4.7M.

Question 4

Is Two Sigma Investments buying or selling CIEN?

Accepted Answer

In Q2 2026, Two Sigma Investments increased its CIEN position by 6,014 shares (+172.5%).

Question 5

When did Two Sigma Investments first buy CIEN?

Accepted Answer

Two Sigma Investments already held CIEN in its Q4 2018 13F, the earliest on record, and has listed it in 21 quarterly 13F filings.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	9,500	+172.5%	$4.7M	0.0%	$490.56	43
2026-Q1	Decreased	3,486	-83.5%	$1.4M	0.0%	$388.23	0
2025-Q4	Unchanged	21,101	0.0%	$4.9M	0.0%	$233.87	0
2025-Q3	Decreased	21,101	-82.5%	$3.1M	0.0%	$145.67	0
2025-Q2	Decreased	120,804	-74.0%	$9.8M	0.0%	$81.33	0
2025-Q1	Increased	465,064	+996.9%	$28.1M	0.1%	$60.43	46
2024-Q4	Decreased	42,397	-25.9%	$3.6M	0.0%	$84.81	0
2024-Q3	Decreased	57,200	-49.7%	$3.5M	0.0%	$61.59	0