CIENA CORP

Ticker: CIEN CUSIP: 171779309 Class: EQTY

STATE OF MICHIGAN RETIREMENT SYSTEM's Holding History (CIK: 0000762152)

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

Q4 2025

Shares 33,296 Value ($000) $7,787 Avg Close $194.00 Range $143.19 - $248.00

Q3 2025

Shares 33,696 Value ($000) $4,908 Avg Close $101.84 Range $76.89 - $146.53

Q2 2025

Shares 34,196 Value ($000) $2,781 Avg Close $71.73 Range $49.21 - $86.21

Q1 2025

Shares 33,996 Value ($000) $2,054 Avg Close $79.05 Range $58.04 - $101.44

Q4 2024

Shares 34,196 Value ($000) $2,900 Avg Close $71.76 Range $59.60 - $91.82

Q3 2024

Shares 34,096 Value ($000) $2,100 Avg Close $52.69 Range $44.89 - $63.06

Q2 2024

Shares 34,796 Value ($000) $1,676 Avg Close $47.46 Range $43.30 - $53.58

Q1 2024

Shares 35,596 Value ($000) $1,760 Avg Close $52.75 Range $44.22 - $63.24

Q4 2023

Shares 35,496 Value ($000) $1,598 Avg Close $44.09 Range $39.94 - $48.36

Q3 2023

Shares 35,696 Value ($000) $1,687 Avg Close $44.08 Range $40.10 - $50.72

Q2 2023

Shares 36,696 Value ($000) $1,559 Avg Close $45.54 Range $40.84 - $52.67

Q1 2023

Shares 37,496 Value ($000) $1,969 Avg Close $49.92 Range $45.83 - $54.25

Q4 2022

Shares 37,696 Value ($000) $1,922 Avg Close $45.21 Range $38.33 - $52.51

Q3 2022

Shares 37,696 Value ($000) $1,524 Avg Close $48.05 Range $39.44 - $56.38

Q2 2022

Shares 38,696 Value ($000) $1,768 Avg Close $51.84 Range $41.63 - $61.78

Q1 2022

Shares 39,296 Value ($000) $2,383 Avg Close $65.45 Range $53.29 - $77.38

Q4 2021

Shares 39,263 Value ($000) $3,022 Avg Close $61.70 Range $51.01 - $78.28

Q3 2021

Shares 38,763 Value ($000) $1,990 Avg Close $55.54 Range $50.34 - $58.85

Q2 2021

Shares 39,063 Value ($000) $2,222 Avg Close $55.12 Range $49.51 - $61.09

Q1 2021

Shares 57,463 Value ($000) $3,144 Avg Close $53.81 Range $47.52 - $57.57

Q4 2020

Shares 56,263 Value ($000) $2,973 Avg Close $44.43 Range $38.03 - $54.05

Q3 2020

Shares 55,963 Value ($000) $2,221 Avg Close $52.62 Range $38.20 - $61.52

Q2 2020

Shares 55,963 Value ($000) $3,031 Avg Close $49.71 Range $38.00 - $57.19

Q1 2020

Shares 42,900 Value ($000) $1,708 Avg Close $41.03 Range $30.58 - $44.61

Q4 2019

Shares 45,500 Value ($000) $1,942 Avg Close $38.10 Range $33.22 - $43.97

Q3 2019

Shares 45,000 Value ($000) $1,765 Avg Close $41.92 Range $37.94 - $46.78

Q2 2019

Shares 42,400 Value ($000) $1,744 Avg Close $38.48 Range $32.76 - $46.23

Q1 2019

Shares 51,300 Value ($000) $1,916 Avg Close $38.83 Range $32.85 - $45.70

Q4 2018

Shares 50,600 Value ($000) $1,716 Avg Close $31.69 Range $28.23 - $36.55

Q3 2018

Shares 52,700 Value ($000) $1,646 Avg Close $28.02 Range $25.19 - $32.33

Q2 2018

Shares 52,800 Value ($000) $1,400 Avg Close $25.40 Range $22.99 - $27.10

Q1 2018

Shares 52,600 Value ($000) $1,362 Avg Close $23.53 Range $20.71 - $27.73

Q4 2017

Shares 51,300 Value ($000) $1,074 Avg Close $21.20 Range $19.40 - $22.63

Q3 2017

Shares 53,300 Value ($000) $1,171 Avg Close $23.93 Range $20.86 - $26.92

Q2 2017

Shares 58,400 Value ($000) $1,461 Avg Close $23.96 Range $21.43 - $27.98

Q1 2017

Shares 57,400 Value ($000) $1,355 Avg Close $24.52 Range $22.73 - $26.84

Q4 2016

Shares 56,100 Value ($000) $1,369 Avg Close $21.85 Range $18.94 - $25.19

Q3 2016

Shares 55,600 Value ($000) $1,212 Avg Close $20.85 Range $17.59 - $23.60

Q2 2016

Shares 51,900 Value ($000) $973 Avg Close $18.11 Range $15.62 - $21.87

Q1 2016

Shares 51,600 Value ($000) $981 Avg Close $18.47 Range $16.32 - $21.14

Q4 2015

Shares 50,100 Value ($000) $1,037 Avg Close $22.97 Range $18.98 - $25.46

Q3 2015

Shares 56,300 Value ($000) $1,167 Avg Close $23.24 Range $17.97 - $26.50

Q2 2015

Shares 53,600 Value ($000) $1,269 Avg Close $22.84 Range $18.75 - $26.20

Q1 2015

Shares 49,100 Value ($000) $948 Avg Close $19.93 Range $17.86 - $21.47

Q4 2014

Shares 50,700 Value ($000) $984 Avg Close $16.70 Range $13.77 - $20.14

Q3 2014

Shares 50,600 Value ($000) $846 Avg Close $19.60 Range $16.66 - $22.46

Q2 2014

Shares 49,500 Value ($000) $1,072 Avg Close $20.54 Range $18.00 - $24.21

Q1 2014

Shares 49,400 Value ($000) $1,123 Avg Close $23.52 Range $21.41 - $27.16

Q4 2013

Shares 48,300 Value ($000) $1,156 Avg Close $23.81 Range $20.93 - $27.94

Q3 2013

Shares 48,100 Value ($000) $1,202 Avg Close $22.53 Range $19.37 - $26.17

Q2 2013

Shares 46,700 Value ($000) $907 Avg Close $16.65 Range $14.14 - $20.60

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	33,296	$7,787	$194.00	$143.19 - $248.00
Q3 2025	33,696	$4,908	$101.84	$76.89 - $146.53
Q2 2025	34,196	$2,781	$71.73	$49.21 - $86.21
Q1 2025	33,996	$2,054	$79.05	$58.04 - $101.44
Q4 2024	34,196	$2,900	$71.76	$59.60 - $91.82
Q3 2024	34,096	$2,100	$52.69	$44.89 - $63.06
Q2 2024	34,796	$1,676	$47.46	$43.30 - $53.58
Q1 2024	35,596	$1,760	$52.75	$44.22 - $63.24
Q4 2023	35,496	$1,598	$44.09	$39.94 - $48.36
Q3 2023	35,696	$1,687	$44.08	$40.10 - $50.72
Q2 2023	36,696	$1,559	$45.54	$40.84 - $52.67
Q1 2023	37,496	$1,969	$49.92	$45.83 - $54.25
Q4 2022	37,696	$1,922	$45.21	$38.33 - $52.51
Q3 2022	37,696	$1,524	$48.05	$39.44 - $56.38
Q2 2022	38,696	$1,768	$51.84	$41.63 - $61.78
Q1 2022	39,296	$2,383	$65.45	$53.29 - $77.38
Q4 2021	39,263	$3,022	$61.70	$51.01 - $78.28
Q3 2021	38,763	$1,990	$55.54	$50.34 - $58.85
Q2 2021	39,063	$2,222	$55.12	$49.51 - $61.09
Q1 2021	57,463	$3,144	$53.81	$47.52 - $57.57
Q4 2020	56,263	$2,973	$44.43	$38.03 - $54.05
Q3 2020	55,963	$2,221	$52.62	$38.20 - $61.52
Q2 2020	55,963	$3,031	$49.71	$38.00 - $57.19
Q1 2020	42,900	$1,708	$41.03	$30.58 - $44.61
Q4 2019	45,500	$1,942	$38.10	$33.22 - $43.97
Q3 2019	45,000	$1,765	$41.92	$37.94 - $46.78
Q2 2019	42,400	$1,744	$38.48	$32.76 - $46.23
Q1 2019	51,300	$1,916	$38.83	$32.85 - $45.70
Q4 2018	50,600	$1,716	$31.69	$28.23 - $36.55
Q3 2018	52,700	$1,646	$28.02	$25.19 - $32.33
Q2 2018	52,800	$1,400	$25.40	$22.99 - $27.10
Q1 2018	52,600	$1,362	$23.53	$20.71 - $27.73
Q4 2017	51,300	$1,074	$21.20	$19.40 - $22.63
Q3 2017	53,300	$1,171	$23.93	$20.86 - $26.92
Q2 2017	58,400	$1,461	$23.96	$21.43 - $27.98
Q1 2017	57,400	$1,355	$24.52	$22.73 - $26.84
Q4 2016	56,100	$1,369	$21.85	$18.94 - $25.19
Q3 2016	55,600	$1,212	$20.85	$17.59 - $23.60
Q2 2016	51,900	$973	$18.11	$15.62 - $21.87
Q1 2016	51,600	$981	$18.47	$16.32 - $21.14
Q4 2015	50,100	$1,037	$22.97	$18.98 - $25.46
Q3 2015	56,300	$1,167	$23.24	$17.97 - $26.50
Q2 2015	53,600	$1,269	$22.84	$18.75 - $26.20
Q1 2015	49,100	$948	$19.93	$17.86 - $21.47
Q4 2014	50,700	$984	$16.70	$13.77 - $20.14
Q3 2014	50,600	$846	$19.60	$16.66 - $22.46
Q2 2014	49,500	$1,072	$20.54	$18.00 - $24.21
Q1 2014	49,400	$1,123	$23.52	$21.41 - $27.16
Q4 2013	48,300	$1,156	$23.81	$20.93 - $27.94
Q3 2013	48,100	$1,202	$22.53	$19.37 - $26.17
Q2 2013	46,700	$907	$16.65	$14.14 - $20.60