CIENA CORP

Ticker: CIEN CUSIP: 171779309 Class: EQTY

PRIMECAP MANAGEMENT CO/CA/'s Holding History (CIK: 0000763212)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 511,600 Value ($000) $119,648 Avg Close $194.00 Range $143.19 - $248.00

Q3 2025

Shares 587,200 Value ($000) $85,537 Avg Close $101.84 Range $76.89 - $146.53

Q2 2025

Shares 554,500 Value ($000) $45,097 Avg Close $71.73 Range $49.21 - $86.21

Q1 2025

Shares 478,550 Value ($000) $28,919 Avg Close $79.05 Range $58.04 - $101.44

Q4 2024

Shares 463,680 Value ($000) $39,325 Avg Close $71.76 Range $59.60 - $91.82

Q3 2024

Shares 127,500 Value ($000) $7,853 Avg Close $52.69 Range $44.89 - $63.06

Q2 2024

Shares 122,500 Value ($000) $5,902 Avg Close $47.46 Range $43.30 - $53.58

Q1 2024

Shares 125,685 Value ($000) $6,215 Avg Close $52.75 Range $44.22 - $63.24

Q4 2023

Shares 109,185 Value ($000) $4,914 Avg Close $44.09 Range $39.94 - $48.36

Q3 2023

Shares 109,185 Value ($000) $5,160 Avg Close $44.08 Range $40.10 - $50.72

Q2 2023

Shares 104,485 Value ($000) $4,440 Avg Close $45.54 Range $40.84 - $52.67

Q1 2023

Shares 102,485 Value ($000) $5,383 Avg Close $49.92 Range $45.83 - $54.25

Q4 2022

Shares 101,485 Value ($000) $5,174 Avg Close $45.21 Range $38.33 - $52.51

Q3 2022

Shares 100,485 Value ($000) $4,063 Avg Close $48.05 Range $39.44 - $56.38

Q2 2022

Shares 100,585 Value ($000) $4,597 Avg Close $51.84 Range $41.63 - $61.78

Q1 2022

Shares 101,085 Value ($000) $6,129 Avg Close $65.45 Range $53.29 - $77.38

Q4 2021

Shares 99,085 Value ($000) $7,627 Avg Close $61.70 Range $51.01 - $78.28

Q3 2021

Shares 99,085 Value ($000) $5,088 Avg Close $55.54 Range $50.34 - $58.85

Q2 2021

Shares 58,085 Value ($000) $3,304 Avg Close $55.12 Range $49.51 - $61.09

Q1 2021

Shares 58,085 Value ($000) $3,178 Avg Close $53.81 Range $47.52 - $57.57

Q4 2020

Shares 113,510 Value ($000) $5,999 Avg Close $44.43 Range $38.03 - $54.05

Q3 2020

Shares 85,810 Value ($000) $3,406 Avg Close $52.62 Range $38.20 - $61.52

Q2 2020

Shares 4,285 Value ($000) $232 Avg Close $49.71 Range $38.00 - $57.19

Q2 2017

Shares 508,127 Value ($000) $12,713 Avg Close $23.96 Range $21.43 - $27.98

Q1 2017

Shares 512,641 Value ($000) $12,103 Avg Close $24.52 Range $22.73 - $26.84

Q4 2016

Shares 517,470 Value ($000) $12,631 Avg Close $21.85 Range $18.94 - $25.19

Q3 2016

Shares 519,170 Value ($000) $11,318 Avg Close $20.85 Range $17.59 - $23.60

Q2 2016

Shares 520,027 Value ($000) $9,751 Avg Close $18.11 Range $15.62 - $21.87

Q1 2016

Shares 520,627 Value ($000) $9,902 Avg Close $18.47 Range $16.32 - $21.14

Q4 2015

Shares 520,627 Value ($000) $10,772 Avg Close $22.97 Range $18.98 - $25.46

Q3 2015

Shares 522,227 Value ($000) $10,821 Avg Close $23.24 Range $17.97 - $26.50

Q2 2015

Shares 630,269 Value ($000) $14,925 Avg Close $22.84 Range $18.75 - $26.20

Q1 2015

Shares 632,469 Value ($000) $12,213 Avg Close $19.93 Range $17.86 - $21.47

Q4 2014

Shares 633,469 Value ($000) $12,296 Avg Close $16.70 Range $13.77 - $20.14

Q3 2014

Shares 636,669 Value ($000) $10,645 Avg Close $19.60 Range $16.66 - $22.46

Q2 2014

Shares 636,669 Value ($000) $13,790 Avg Close $20.54 Range $18.00 - $24.21

Q1 2014

Shares 642,026 Value ($000) $14,600 Avg Close $23.52 Range $21.41 - $27.16

Q4 2013

Shares 647,026 Value ($000) $15,483 Avg Close $23.81 Range $20.93 - $27.94

Q3 2013

Shares 650,926 Value ($000) $16,260 Avg Close $22.53 Range $19.37 - $26.17

Q2 2013

Shares 662,326 Value ($000) $12,862 Avg Close $16.65 Range $14.14 - $20.60

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	511,600	$119,648	$194.00	$143.19 - $248.00
Q3 2025	587,200	$85,537	$101.84	$76.89 - $146.53
Q2 2025	554,500	$45,097	$71.73	$49.21 - $86.21
Q1 2025	478,550	$28,919	$79.05	$58.04 - $101.44
Q4 2024	463,680	$39,325	$71.76	$59.60 - $91.82
Q3 2024	127,500	$7,853	$52.69	$44.89 - $63.06
Q2 2024	122,500	$5,902	$47.46	$43.30 - $53.58
Q1 2024	125,685	$6,215	$52.75	$44.22 - $63.24
Q4 2023	109,185	$4,914	$44.09	$39.94 - $48.36
Q3 2023	109,185	$5,160	$44.08	$40.10 - $50.72
Q2 2023	104,485	$4,440	$45.54	$40.84 - $52.67
Q1 2023	102,485	$5,383	$49.92	$45.83 - $54.25
Q4 2022	101,485	$5,174	$45.21	$38.33 - $52.51
Q3 2022	100,485	$4,063	$48.05	$39.44 - $56.38
Q2 2022	100,585	$4,597	$51.84	$41.63 - $61.78
Q1 2022	101,085	$6,129	$65.45	$53.29 - $77.38
Q4 2021	99,085	$7,627	$61.70	$51.01 - $78.28
Q3 2021	99,085	$5,088	$55.54	$50.34 - $58.85
Q2 2021	58,085	$3,304	$55.12	$49.51 - $61.09
Q1 2021	58,085	$3,178	$53.81	$47.52 - $57.57
Q4 2020	113,510	$5,999	$44.43	$38.03 - $54.05
Q3 2020	85,810	$3,406	$52.62	$38.20 - $61.52
Q2 2020	4,285	$232	$49.71	$38.00 - $57.19
Q2 2017	508,127	$12,713	$23.96	$21.43 - $27.98
Q1 2017	512,641	$12,103	$24.52	$22.73 - $26.84
Q4 2016	517,470	$12,631	$21.85	$18.94 - $25.19
Q3 2016	519,170	$11,318	$20.85	$17.59 - $23.60
Q2 2016	520,027	$9,751	$18.11	$15.62 - $21.87
Q1 2016	520,627	$9,902	$18.47	$16.32 - $21.14
Q4 2015	520,627	$10,772	$22.97	$18.98 - $25.46
Q3 2015	522,227	$10,821	$23.24	$17.97 - $26.50
Q2 2015	630,269	$14,925	$22.84	$18.75 - $26.20
Q1 2015	632,469	$12,213	$19.93	$17.86 - $21.47
Q4 2014	633,469	$12,296	$16.70	$13.77 - $20.14
Q3 2014	636,669	$10,645	$19.60	$16.66 - $22.46
Q2 2014	636,669	$13,790	$20.54	$18.00 - $24.21
Q1 2014	642,026	$14,600	$23.52	$21.41 - $27.16
Q4 2013	647,026	$15,483	$23.81	$20.93 - $27.94
Q3 2013	650,926	$16,260	$22.53	$19.37 - $26.17
Q2 2013	662,326	$12,862	$16.65	$14.14 - $20.60