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
2026
Q1 		$155M Sell
398,579
-700,014
-64% -$214M 0.51% 52
2025
Q4 		$257M Sell
1,098,593
-1,342,295
-55% -$260M 0.72% 27
2025
Q3 		$356M Sell
2,440,888
-267,652
-10% -$27.3M 0.92% 16
2025
Q2 		$220M Buy
2,708,540
+702,909
+35% +$50.4M 0.58% 36
2025
Q1 		$121M Buy
+2,005,631
New +$159M 0.34% 83
2019
Q2 		– Sell
-472,534
Closed -$17.6M – 379
2019
Q1 		$17.6M Sell
472,534
-48,380
-9% -$1.88M 0.07% 237
2018
Q4 		$17.7M Buy
520,914
+7,636
+1% +$242K 0.09% 208
2018
Q3 		$16M Sell
513,278
-40,768
-7% -$1.14M 0.06% 288
2018
Q2 		$14.7M Buy
+554,046
New +$14.1M 0.05% 289

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