CIENA CORP

Ticker: CIEN CUSIP: 171779309 Class: EQTY

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

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

Q4 2025

Shares 214,784 Value ($000) $50,232 Avg Close $194.00 Range $143.19 - $248.00

Q3 2025

Shares 133,436 Value ($000) $19,438 Avg Close $101.84 Range $76.89 - $146.53

Q2 2025

Shares 133,382 Value ($000) $10,848 Avg Close $71.73 Range $49.21 - $86.21

Q1 2025

Shares 133,577 Value ($000) $8,072 Avg Close $79.05 Range $58.04 - $101.44

Q4 2024

Shares 135,105 Value ($000) $11,458 Avg Close $71.76 Range $59.60 - $91.82

Q3 2024

Shares 136,995 Value ($000) $8,438 Avg Close $52.69 Range $44.89 - $63.06

Q2 2024

Shares 142,076 Value ($000) $6,845 Avg Close $47.46 Range $43.30 - $53.58

Q1 2024

Shares 146,099 Value ($000) $7,225 Avg Close $52.75 Range $44.22 - $63.24

Q4 2023

Shares 157,177 Value ($000) $7,075 Avg Close $44.09 Range $39.94 - $48.36

Q3 2023

Shares 166,084 Value ($000) $7,849 Avg Close $44.08 Range $40.10 - $50.72

Q2 2023

Shares 181,814 Value ($000) $7,725 Avg Close $45.54 Range $40.84 - $52.67

Q1 2023

Shares 186,043 Value ($000) $9,771 Avg Close $49.92 Range $45.83 - $54.25

Q4 2022

Shares 190,105 Value ($000) $9,692 Avg Close $45.21 Range $38.33 - $52.51

Q3 2022

Shares 190,775 Value ($000) $7,713 Avg Close $48.05 Range $39.44 - $56.38

Q2 2022

Shares 196,174 Value ($000) $8,965 Avg Close $51.84 Range $41.63 - $61.78

Q1 2022

Shares 199,010 Value ($000) $12,066 Avg Close $65.45 Range $53.29 - $77.38

Q4 2021

Shares 215,560 Value ($000) $16,592 Avg Close $61.70 Range $51.01 - $78.28

Q3 2021

Shares 259,547 Value ($000) $13,328 Avg Close $55.54 Range $50.34 - $58.85

Q2 2021

Shares 262,456 Value ($000) $14,931 Avg Close $55.12 Range $49.51 - $61.09

Q1 2021

Shares 265,578 Value ($000) $14,532 Avg Close $53.81 Range $47.52 - $57.57

Q4 2020

Shares 266,215 Value ($000) $14,069 Avg Close $44.43 Range $38.03 - $54.05

Q3 2020

Shares 262,360 Value ($000) $10,413 Avg Close $52.62 Range $38.20 - $61.52

Q2 2020

Shares 257,108 Value ($000) $13,925 Avg Close $49.71 Range $38.00 - $57.19

Q1 2020

Shares 254,886 Value ($000) $10,147 Avg Close $41.03 Range $30.58 - $44.61

Q4 2019

Shares 239,816 Value ($000) $10,238 Avg Close $38.10 Range $33.22 - $43.97

Q3 2019

Shares 246,947 Value ($000) $9,688 Avg Close $41.92 Range $37.94 - $46.78

Q2 2019

Shares 246,280 Value ($000) $10,129 Avg Close $38.48 Range $32.76 - $46.23

Q1 2019

Shares 219,506 Value ($000) $8,196 Avg Close $38.83 Range $32.85 - $45.70

Q4 2018

Shares 224,387 Value ($000) $7,609 Avg Close $31.69 Range $28.23 - $36.55

Q3 2018

Shares 219,327 Value ($000) $6,852 Avg Close $28.02 Range $25.19 - $32.33

Q2 2018

Shares 219,405 Value ($000) $5,816 Avg Close $25.40 Range $22.99 - $27.10

Q1 2018

Shares 218,556 Value ($000) $5,661 Avg Close $23.53 Range $20.71 - $27.73

Q4 2017

Shares 222,498 Value ($000) $4,657 Avg Close $21.20 Range $19.40 - $22.63

Q3 2017

Shares 226,037 Value ($000) $4,966 Avg Close $23.93 Range $20.86 - $26.92

Q2 2017

Shares 250,092 Value ($000) $6,257 Avg Close $23.96 Range $21.43 - $27.98

Q1 2017

Shares 270,559 Value ($000) $6,388 Avg Close $24.52 Range $22.73 - $26.84

Q4 2016

Shares 283,259 Value ($000) $6,914 Avg Close $21.85 Range $18.94 - $25.19

Q3 2016

Shares 291,059 Value ($000) $6,345 Avg Close $20.85 Range $17.59 - $23.60

Q2 2016

Shares 288,459 Value ($000) $5,409 Avg Close $18.11 Range $15.62 - $21.87

Q1 2016

Shares 262,195 Value ($000) $4,987 Avg Close $18.47 Range $16.32 - $21.14

Q4 2015

Shares 228,721 Value ($000) $4,732 Avg Close $22.97 Range $18.98 - $25.46

Q3 2015

Shares 225,111 Value ($000) $4,664 Avg Close $23.24 Range $17.97 - $26.50

Q2 2015

Shares 214,955 Value ($000) $5,090 Avg Close $22.84 Range $18.75 - $26.20

Q1 2015

Shares 192,123 Value ($000) $3,710 Avg Close $19.93 Range $17.86 - $21.47

Q4 2014

Shares 195,723 Value ($000) $3,799 Avg Close $16.70 Range $13.77 - $20.14

Q3 2014

Shares 193,894 Value ($000) $3,242 Avg Close $19.60 Range $16.66 - $22.46

Q2 2014

Shares 191,793 Value ($000) $4,154 Avg Close $20.54 Range $18.00 - $24.21

Q1 2014

Shares 184,493 Value ($000) $4,195 Avg Close $23.52 Range $21.41 - $27.16

Q4 2013

Shares 183,793 Value ($000) $4,398 Avg Close $23.81 Range $20.93 - $27.94

Q3 2013

Shares 182,593 Value ($000) $4,561 Avg Close $22.53 Range $19.37 - $26.17

Q2 2013

Shares 176,919 Value ($000) $3,436 Avg Close $16.65 Range $14.14 - $20.60

Q1 2013

Shares 172,348 Value ($000) $2,759 Avg Close $15.85 Range $14.37 - $17.78

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	214,784	$50,232	$194.00	$143.19 - $248.00
Q3 2025	133,436	$19,438	$101.84	$76.89 - $146.53
Q2 2025	133,382	$10,848	$71.73	$49.21 - $86.21
Q1 2025	133,577	$8,072	$79.05	$58.04 - $101.44
Q4 2024	135,105	$11,458	$71.76	$59.60 - $91.82
Q3 2024	136,995	$8,438	$52.69	$44.89 - $63.06
Q2 2024	142,076	$6,845	$47.46	$43.30 - $53.58
Q1 2024	146,099	$7,225	$52.75	$44.22 - $63.24
Q4 2023	157,177	$7,075	$44.09	$39.94 - $48.36
Q3 2023	166,084	$7,849	$44.08	$40.10 - $50.72
Q2 2023	181,814	$7,725	$45.54	$40.84 - $52.67
Q1 2023	186,043	$9,771	$49.92	$45.83 - $54.25
Q4 2022	190,105	$9,692	$45.21	$38.33 - $52.51
Q3 2022	190,775	$7,713	$48.05	$39.44 - $56.38
Q2 2022	196,174	$8,965	$51.84	$41.63 - $61.78
Q1 2022	199,010	$12,066	$65.45	$53.29 - $77.38
Q4 2021	215,560	$16,592	$61.70	$51.01 - $78.28
Q3 2021	259,547	$13,328	$55.54	$50.34 - $58.85
Q2 2021	262,456	$14,931	$55.12	$49.51 - $61.09
Q1 2021	265,578	$14,532	$53.81	$47.52 - $57.57
Q4 2020	266,215	$14,069	$44.43	$38.03 - $54.05
Q3 2020	262,360	$10,413	$52.62	$38.20 - $61.52
Q2 2020	257,108	$13,925	$49.71	$38.00 - $57.19
Q1 2020	254,886	$10,147	$41.03	$30.58 - $44.61
Q4 2019	239,816	$10,238	$38.10	$33.22 - $43.97
Q3 2019	246,947	$9,688	$41.92	$37.94 - $46.78
Q2 2019	246,280	$10,129	$38.48	$32.76 - $46.23
Q1 2019	219,506	$8,196	$38.83	$32.85 - $45.70
Q4 2018	224,387	$7,609	$31.69	$28.23 - $36.55
Q3 2018	219,327	$6,852	$28.02	$25.19 - $32.33
Q2 2018	219,405	$5,816	$25.40	$22.99 - $27.10
Q1 2018	218,556	$5,661	$23.53	$20.71 - $27.73
Q4 2017	222,498	$4,657	$21.20	$19.40 - $22.63
Q3 2017	226,037	$4,966	$23.93	$20.86 - $26.92
Q2 2017	250,092	$6,257	$23.96	$21.43 - $27.98
Q1 2017	270,559	$6,388	$24.52	$22.73 - $26.84
Q4 2016	283,259	$6,914	$21.85	$18.94 - $25.19
Q3 2016	291,059	$6,345	$20.85	$17.59 - $23.60
Q2 2016	288,459	$5,409	$18.11	$15.62 - $21.87
Q1 2016	262,195	$4,987	$18.47	$16.32 - $21.14
Q4 2015	228,721	$4,732	$22.97	$18.98 - $25.46
Q3 2015	225,111	$4,664	$23.24	$17.97 - $26.50
Q2 2015	214,955	$5,090	$22.84	$18.75 - $26.20
Q1 2015	192,123	$3,710	$19.93	$17.86 - $21.47
Q4 2014	195,723	$3,799	$16.70	$13.77 - $20.14
Q3 2014	193,894	$3,242	$19.60	$16.66 - $22.46
Q2 2014	191,793	$4,154	$20.54	$18.00 - $24.21
Q1 2014	184,493	$4,195	$23.52	$21.41 - $27.16
Q4 2013	183,793	$4,398	$23.81	$20.93 - $27.94
Q3 2013	182,593	$4,561	$22.53	$19.37 - $26.17
Q2 2013	176,919	$3,436	$16.65	$14.14 - $20.60
Q1 2013	172,348	$2,759	$15.85	$14.37 - $17.78