Question 1

How many shares of CIEN does WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC own?

Accepted Answer

As of 2026-Q1, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds 398,579 shares of CIEN (CIENA CORP).

Question 2

What is WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's CIEN position worth?

Accepted Answer

As of 2026-Q1, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's CIEN position is worth $154.7M.

Question 3

Is WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC buying or selling CIEN?

Accepted Answer

In 2026-Q1, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC decreased their CIEN position (-63.7% change in shares).

Question 4

When did WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC first buy CIEN?

Accepted Answer

Based on available 13F filings, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC first reported a position in CIEN in 2026-Q1. They have held the position across 5 quarters.