William Blair Investment Management
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William Blair Investment Management’s Ciena CIEN Stock Holding History

William Blair Investment Management’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
2025
Q3 		$356M Sell
2025
Q2 		$220M Buy
2025
Q1 		$121M Buy
2019
Q2 		– Sell
2019
Q1 		$17.6M Sell
2018
Q4 		$17.7M Buy
2018
Q3 		$16M Sell
2018
Q2 		$14.7M Buy