CIEN US Equity

CIENA CORP

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Information Technology · Telephone & Telegraph Apparatus · CIK 936395 · FYE 1031

$330.37

-20.14 (-5.75%)

USD · as of 2026-07-29 · marketstack

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Institutional ownership· 13F filers holding CIEN · 2026-Q1 methodology → sources →

1,074 holders

% of shares outstanding held

94.8%

Shares held (13F)

134,157,717

Reporting holders

1,074

Top holders

largest 100 of 1,074 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	21,209,75621.2M	$8.2B	14.98%	—
2	BlackRock, Inc.	13,373,78713.4M	$5.2B	9.45%	TRIM -20%
3	JPMORGAN CHASE & CO	10,226,64910.2M	$3.7B	7.22%	TRIM -6%
4	VANGUARD CAPITAL MANAGEMENT LLC	9,169,3559.2M	$3.6B	6.48%	NEW†
5	VANGUARD PORTFOLIO MANAGEMENT LLC	7,369,1247.4M	$2.9B	5.21%	NEW†
6	STATE STREET CORP	6,309,0506.3M	$2.4B	4.46%	ADD 24%
7	PRICE T ROWE ASSOCIATES INC /MD/	5,242,8025.2M	$2.0B	3.70%	ADD 29%
8	GEODE CAPITAL MANAGEMENT, LLC	4,065,5594.1M	$1.6B	2.87%	ADD 51%
9	Capital Research Global Investors	2,750,0502.8M	$1.1B	1.94%	NEW
10	BANK OF AMERICA CORP /DE/	1,954,6322.0M	$759M	1.38%	TRIM -10%
11	Capital World Investors	1,724,8071.7M	$670M	1.22%	TRIM -8%
12	Jericho Capital Asset Management L.P.	1,656,1721.7M	$643M	1.17%	—
13	MORGAN STANLEY	1,561,5541.6M	$606M	1.10%	ADD 13%
14	Invesco Ltd.	1,530,2931.5M	$594M	1.08%	—
15	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	1,388,4771.4M	$539M	0.98%	TRIM -38%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	1,272,2581.3M	$494M	0.90%	ADD 36%
17	VOYA INVESTMENT MANAGEMENT LLC	1,205,0991.2M	$468M	0.85%	ADD 27%
18	NORTHERN TRUST CORP	1,187,2911.2M	$461M	0.84%	TRIM -2%
19	DIMENSIONAL FUND ADVISORS LP	1,146,0201.1M	$445M	0.81%	TRIM -18%
20	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	1,021,5861.0M	$397M	0.72%	TRIM -48%
21	AQR CAPITAL MANAGEMENT LLC	977,094977,094	$375M	0.69%	TRIM -31%
22	Bank of New York Mellon Corp	926,858926,858	$360M	0.65%	TRIM -17%
23	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	851,932851,932	$331M	0.60%	ADD 22%
24	Nuveen, LLC	844,193844,193	$328M	0.60%	TRIM -6%
25	LONE PINE CAPITAL LLCtracked	809,522809,522	$314M	0.57%	NEW
26	Polar Capital Holdings Plc	798,395798,395	$310M	0.56%	TRIM -38%
27	VANGUARD FIDUCIARY TRUST CO	793,398793,398	$308M	0.56%	NEW
28	GOLDMAN SACHS GROUP INC	773,258773,258	$300M	0.55%	ADD 74%
29	Atreides Management, LP	676,807676,807	$263M	0.48%	TRIM -53%
30	Legal & General Group Plc	648,383648,383	$252M	0.46%	ADD 27%
31	UBS Group AG	648,209648,209	$252M	0.46%	ADD 20%
32	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	582,668582,668	$226M	0.41%	TRIM -4%
33	Point72 Asset Management, L.P.	544,655544,655	$211M	0.38%	ADD 16%
34	AMERICAN CENTURY COMPANIES INC	535,842535,842	$208M	0.38%	ADD 112%
35	DEUTSCHE BANK AG\	527,888527,888	$205M	0.37%	TRIM -11%
36	PRIMECAP MANAGEMENT CO/CA/	438,050438,050	$170M	0.31%	TRIM -14%
37	FIRST TRUST ADVISORS LP	436,945436,945	$170M	0.31%	TRIM -15%
38	Amundi	431,232431,232	$167M	0.30%	TRIM -11%
39	BNP PARIBAS FINANCIAL MARKETS	423,783423,783	$165M	0.30%	ADD 582%
40	T. Rowe Price Investment Management, Inc.	418,459418,459	$162M	0.30%	ADD 326821%
41	Swiss National Bank	413,332413,332	$160M	0.29%	ADD 7%
42	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	398,579398,579	$155M	0.28%	TRIM -64%
43	SCHRODER INVESTMENT MANAGEMENT GROUP	394,092394,092	$144M	0.28%	TRIM -34%
44	Assenagon Asset Management S.A.	364,547364,547	$142M	0.26%	TRIM -29%
45	WELLS FARGO & COMPANY/MN	352,445352,445	$137M	0.25%	ADD 22%
46	ACADIAN ASSET MANAGEMENT LLC	330,121330,121	$128M	0.23%	ADD 17%
47	PRUDENTIAL FINANCIAL INC	325,763325,763	$126M	0.23%	TRIM -33%
48	WEALTH ENHANCEMENT ADVISORY SERVICES, LLC	290,123290,123	$126M	0.20%	TRIM -60%
49	Balyasny Asset Management L.P.	323,419323,419	$126M	0.23%	TRIM -27%
50	Sumitomo Mitsui Trust Group, Inc.	321,825321,825	$125M	0.23%	ADD 11%
51	ALLIANCEBERNSTEIN L.P.	527,411527,411	$123M	0.37%	ADD 47%
52	Mitsubishi UFJ Asset Management Co., Ltd.	317,137317,137	$123M	0.22%	ADD 135%
53	Anatole Investment Management Ltd	313,445313,445	$122M	0.22%	TRIM -38%
54	Vanguard Global Advisers, LLC	310,389310,389	$121M	0.22%	NEW
55	RAYMOND JAMES FINANCIAL INC	304,779304,779	$118M	0.22%	TRIM -15%
56	BARROW HANLEY MEWHINNEY & STRAUSS LLC	301,554301,554	$117M	0.21%	TRIM -37%
57	National Pension Service	298,543298,543	$116M	0.21%	ADD 41%
58	Allianz Asset Management GmbH	289,386289,386	$112M	0.20%	ADD 67%
59	NEUBERGER BERMAN GROUP LLC	289,692289,692	$112M	0.20%	TRIM -25%
60	1832 Asset Management L.P.	287,400287,400	$112M	0.20%	TRIM -64%
61	Robeco Institutional Asset Management B.V.	267,943267,943	$104M	0.19%	ADD 414%
62	BARCLAYS PLC	265,543265,543	$103M	0.19%	ADD 27%
63	ROYAL BANK OF CANADA	263,542263,542	$102M	0.19%	TRIM -9%
64	Foundations Investment Advisors, LLC	256,498256,498	$100M	0.18%	—
65	JANUS HENDERSON GROUP PLC	249,204249,204	$97M	0.18%	TRIM -44%
66	Analog Century Management LP	247,412247,412	$96M	0.17%	TRIM -42%
67	RHUMBLINE ADVISERS	246,308246,308	$96M	0.17%	TRIM -36%
68	VANGUARD ASSET MANAGEMENT, Ltd	244,340244,340	$95M	0.17%	NEW
69	California Public Employees Retirement System	237,900237,900	$92M	0.17%	—
70	Whale Rock Capital Management LLC	231,267231,267	$90M	0.16%	TRIM -74%
71	HSBC HOLDINGS PLC	223,203223,203	$87M	0.16%	ADD 105%
72	Munro Partners	214,975214,975	$83M	0.15%	TRIM -29%
73	Williams Jones Wealth Management, LLC.	214,693214,693	$83M	0.15%	TRIM -7%
74	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	209,689209,689	$81M	0.15%	TRIM -2%
75	CITIGROUP INC	200,056200,056	$78M	0.14%	TRIM -20%
76	Amanah Holdings Trust	200,000200,000	$78M	0.14%	—
77	ENVESTNET ASSET MANAGEMENT INC	191,201191,201	$74M	0.14%	TRIM -27%
78	SG Americas Securities, LLC	190,949190,949	$74M	0.13%	ADD 147%
79	AMERIPRISE FINANCIAL INC	186,915186,915	$72M	0.13%	TRIM -31%
80	Russell Investments Group, Ltd.	178,491178,491	$69M	0.13%	ADD 65%
81	Senvest Management, LLC	172,926172,926	$67M	0.12%	TRIM -39%
82	Zurcher Kantonalbank (Zurich Cantonalbank)	172,289172,289	$67M	0.12%	ADD 16%
83	TD Asset Management Inc	169,916169,916	$66M	0.12%	—
84	Stephens Investment Management Group LLC	166,171166,171	$65M	0.12%	TRIM -46%
85	Zurich Insurance Group Ltd/FI	165,181165,181	$64M	0.12%	TRIM -55%
86	North Growth Management Ltd.	157,000157,000	$61M	0.11%	TRIM -36%
87	PRINCIPAL FINANCIAL GROUP INC	156,922156,922	$61M	0.11%	TRIM -48%
88	LPL Financial LLC	155,993155,993	$61M	0.11%	ADD 2%
89	SEI INVESTMENTS CO	144,773144,773	$56M	0.10%	TRIM -42%
90	WELLINGTON MANAGEMENT GROUP LLP	144,377144,377	$56M	0.10%	ADD 34%
91	Bridgewater Associates, LP	143,846143,846	$56M	0.10%	TRIM -32%
92	Tidal Investments LLC	142,146142,146	$55M	0.10%	ADD 224%
93	BECKER CAPITAL MANAGEMENT INC	141,669141,669	$55M	0.10%	TRIM -29%
94	CITADEL ADVISORS LLC	140,435140,435	$55M	0.10%	TRIM -80%
95	ROYAL LONDON ASSET MANAGEMENT LTD	134,829134,829	$52M	0.10%	ADD 3566%
96	Ensign Peak Advisors, Inc	134,483134,483	$52M	0.10%	ADD 58%
97	Freestone Grove Partners LP	133,267133,267	$52M	0.09%	NEW
98	DigitalBridge Group, Inc.	132,081132,081	$51M	0.09%	TRIM -20%
99	ThornTree Capital Partners LP	130,272130,272	$51M	0.09%	TRIM -27%
100	CI INVESTMENTS INC.	128,643128,643	$50M	0.09%	TRIM -25%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

21.5M

21.3M

21.2M

21.1M

21.2M

$8.2B

BlackRock, Inc.

17.1M

17.0M

17.1M

15.6M

16.7M

13.4M

$5.2B

JPMORGAN CHASE & CO

4.4M

4.8M

5.2M

12.9M

10.9M

10.2M

$3.7B

VANGUARD CAPITAL MANAGEMENT LLC

—

9.2M

$3.6B

VANGUARD PORTFOLIO MANAGEMENT LLC

—

7.4M

$2.9B

STATE STREET CORP

4.6M

4.5M

4.4M

5.1M

6.3M

$2.4B

PRICE T ROWE ASSOCIATES INC /MD/

4.6M

1.2M

262K

2.6M

4.1M

5.2M

$2.0B

GEODE CAPITAL MANAGEMENT, LLC

2.4M

2.5M

2.7M

4.1M

$1.6B

Capital Research Global Investors

—

2.8M

$1.1B

BANK OF AMERICA CORP /DE/

3.2M

3.5M

3.1M

2.2M

2.0M

$759M

Capital World Investors

—

1.9M

1.7M

1.8M

1.9M

1.7M

$670M

Jericho Capital Asset Management L.P.

—

1.3M

2.0M

1.7M

$643M

MORGAN STANLEY

1.5M

1.9M

1.7M

1.4M

1.6M

$606M

Invesco Ltd.

333K

282K

1.2M

1.5M

$594M

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

530K

201K

50K

1.1M

2.2M

1.4M

$539M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	1,074	134,157,717	94.8%	$51.8B
2025-Q4

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · CIEN

Large holders — 13G, passive (top 5 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

QII

2026-03-31

SEC →

JPMORGAN CHASE & CO

7.7%

QII

2025-12-31

SEC →

VANGUARD CAPITAL MANAGEMENT LLC

7.47%

QII

2026-03-31

SEC →

VANGUARD PORTFOLIO MANAGEMENT LLC

5.22%

QII

2026-03-31

SEC →

VANGUARD GROUP INC

QII

Institutional ownership· 13F filers holding CIEN · 2026-Q1 methodology → sources →

1,074 holders

% of shares outstanding held

94.8%

Shares held (13F)

134,157,717

Reporting holders

1,074

Top holders

largest 100 of 1,074 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	21,209,75621.2M	$8.2B	14.98%	—
2	BlackRock, Inc.	13,373,78713.4M	$5.2B	9.45%	TRIM -20%
3	JPMORGAN CHASE & CO	10,226,64910.2M	$3.7B	7.22%	TRIM -6%
4	VANGUARD CAPITAL MANAGEMENT LLC	9,169,3559.2M	$3.6B	6.48%	NEW†
5	VANGUARD PORTFOLIO MANAGEMENT LLC	7,369,1247.4M	$2.9B	5.21%	NEW†
6	STATE STREET CORP	6,309,0506.3M	$2.4B	4.46%	ADD 24%
7	PRICE T ROWE ASSOCIATES INC /MD/	5,242,8025.2M	$2.0B	3.70%	ADD 29%
8	GEODE CAPITAL MANAGEMENT, LLC	4,065,5594.1M	$1.6B	2.87%	ADD 51%
9	Capital Research Global Investors	2,750,0502.8M	$1.1B	1.94%	NEW
10	BANK OF AMERICA CORP /DE/	1,954,6322.0M	$759M	1.38%	TRIM -10%
11	Capital World Investors	1,724,8071.7M	$670M	1.22%	TRIM -8%
12	Jericho Capital Asset Management L.P.	1,656,1721.7M	$643M	1.17%	—
13	MORGAN STANLEY	1,561,5541.6M	$606M	1.10%	ADD 13%
14	Invesco Ltd.	1,530,2931.5M	$594M	1.08%	—
15	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	1,388,4771.4M	$539M	0.98%	TRIM -38%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	1,272,2581.3M	$494M	0.90%	ADD 36%
17	VOYA INVESTMENT MANAGEMENT LLC	1,205,0991.2M	$468M	0.85%	ADD 27%
18	NORTHERN TRUST CORP	1,187,2911.2M	$461M	0.84%	TRIM -2%
19	DIMENSIONAL FUND ADVISORS LP	1,146,0201.1M	$445M	0.81%	TRIM -18%
20	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	1,021,5861.0M	$397M	0.72%	TRIM -48%
21	AQR CAPITAL MANAGEMENT LLC	977,094977,094	$375M	0.69%	TRIM -31%
22	Bank of New York Mellon Corp	926,858926,858	$360M	0.65%	TRIM -17%
23	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	851,932851,932	$331M	0.60%	ADD 22%
24	Nuveen, LLC	844,193844,193	$328M	0.60%	TRIM -6%
25	LONE PINE CAPITAL LLCtracked	809,522809,522	$314M	0.57%	NEW
26	Polar Capital Holdings Plc	798,395798,395	$310M	0.56%	TRIM -38%
27	VANGUARD FIDUCIARY TRUST CO	793,398793,398	$308M	0.56%	NEW
28	GOLDMAN SACHS GROUP INC	773,258773,258	$300M	0.55%	ADD 74%
29	Atreides Management, LP	676,807676,807	$263M	0.48%	TRIM -53%
30	Legal & General Group Plc	648,383648,383	$252M	0.46%	ADD 27%
31	UBS Group AG	648,209648,209	$252M	0.46%	ADD 20%
32	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	582,668582,668	$226M	0.41%	TRIM -4%
33	Point72 Asset Management, L.P.	544,655544,655	$211M	0.38%	ADD 16%
34	AMERICAN CENTURY COMPANIES INC	535,842535,842	$208M	0.38%	ADD 112%
35	DEUTSCHE BANK AG\	527,888527,888	$205M	0.37%	TRIM -11%
36	PRIMECAP MANAGEMENT CO/CA/	438,050438,050	$170M	0.31%	TRIM -14%
37	FIRST TRUST ADVISORS LP	436,945436,945	$170M	0.31%	TRIM -15%
38	Amundi	431,232431,232	$167M	0.30%	TRIM -11%
39	BNP PARIBAS FINANCIAL MARKETS	423,783423,783	$165M	0.30%	ADD 582%
40	T. Rowe Price Investment Management, Inc.	418,459418,459	$162M	0.30%	ADD 326821%
41	Swiss National Bank	413,332413,332	$160M	0.29%	ADD 7%
42	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	398,579398,579	$155M	0.28%	TRIM -64%
43	SCHRODER INVESTMENT MANAGEMENT GROUP	394,092394,092	$144M	0.28%	TRIM -34%
44	Assenagon Asset Management S.A.	364,547364,547	$142M	0.26%	TRIM -29%
45	WELLS FARGO & COMPANY/MN	352,445352,445	$137M	0.25%	ADD 22%
46	ACADIAN ASSET MANAGEMENT LLC	330,121330,121	$128M	0.23%	ADD 17%
47	PRUDENTIAL FINANCIAL INC	325,763325,763	$126M	0.23%	TRIM -33%
48	WEALTH ENHANCEMENT ADVISORY SERVICES, LLC	290,123290,123	$126M	0.20%	TRIM -60%
49	Balyasny Asset Management L.P.	323,419323,419	$126M	0.23%	TRIM -27%
50	Sumitomo Mitsui Trust Group, Inc.	321,825321,825	$125M	0.23%	ADD 11%
51	ALLIANCEBERNSTEIN L.P.	527,411527,411	$123M	0.37%	ADD 47%
52	Mitsubishi UFJ Asset Management Co., Ltd.	317,137317,137	$123M	0.22%	ADD 135%
53	Anatole Investment Management Ltd	313,445313,445	$122M	0.22%	TRIM -38%
54	Vanguard Global Advisers, LLC	310,389310,389	$121M	0.22%	NEW
55	RAYMOND JAMES FINANCIAL INC	304,779304,779	$118M	0.22%	TRIM -15%
56	BARROW HANLEY MEWHINNEY & STRAUSS LLC	301,554301,554	$117M	0.21%	TRIM -37%
57	National Pension Service	298,543298,543	$116M	0.21%	ADD 41%
58	Allianz Asset Management GmbH	289,386289,386	$112M	0.20%	ADD 67%
59	NEUBERGER BERMAN GROUP LLC	289,692289,692	$112M	0.20%	TRIM -25%
60	1832 Asset Management L.P.	287,400287,400	$112M	0.20%	TRIM -64%
61	Robeco Institutional Asset Management B.V.	267,943267,943	$104M	0.19%	ADD 414%
62	BARCLAYS PLC	265,543265,543	$103M	0.19%	ADD 27%
63	ROYAL BANK OF CANADA	263,542263,542	$102M	0.19%	TRIM -9%
64	Foundations Investment Advisors, LLC	256,498256,498	$100M	0.18%	—
65	JANUS HENDERSON GROUP PLC	249,204249,204	$97M	0.18%	TRIM -44%
66	Analog Century Management LP	247,412247,412	$96M	0.17%	TRIM -42%
67	RHUMBLINE ADVISERS	246,308246,308	$96M	0.17%	TRIM -36%
68	VANGUARD ASSET MANAGEMENT, Ltd	244,340244,340	$95M	0.17%	NEW
69	California Public Employees Retirement System	237,900237,900	$92M	0.17%	—
70	Whale Rock Capital Management LLC	231,267231,267	$90M	0.16%	TRIM -74%
71	HSBC HOLDINGS PLC	223,203223,203	$87M	0.16%	ADD 105%
72	Munro Partners	214,975214,975	$83M	0.15%	TRIM -29%
73	Williams Jones Wealth Management, LLC.	214,693214,693	$83M	0.15%	TRIM -7%
74	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	209,689209,689	$81M	0.15%	TRIM -2%
75	CITIGROUP INC	200,056200,056	$78M	0.14%	TRIM -20%
76	Amanah Holdings Trust	200,000200,000	$78M	0.14%	—
77	ENVESTNET ASSET MANAGEMENT INC	191,201191,201	$74M	0.14%	TRIM -27%
78	SG Americas Securities, LLC	190,949190,949	$74M	0.13%	ADD 147%
79	AMERIPRISE FINANCIAL INC	186,915186,915	$72M	0.13%	TRIM -31%
80	Russell Investments Group, Ltd.	178,491178,491	$69M	0.13%	ADD 65%
81	Senvest Management, LLC	172,926172,926	$67M	0.12%	TRIM -39%
82	Zurcher Kantonalbank (Zurich Cantonalbank)	172,289172,289	$67M	0.12%	ADD 16%
83	TD Asset Management Inc	169,916169,916	$66M	0.12%	—
84	Stephens Investment Management Group LLC	166,171166,171	$65M	0.12%	TRIM -46%
85	Zurich Insurance Group Ltd/FI	165,181165,181	$64M	0.12%	TRIM -55%
86	North Growth Management Ltd.	157,000157,000	$61M	0.11%	TRIM -36%
87	PRINCIPAL FINANCIAL GROUP INC	156,922156,922	$61M	0.11%	TRIM -48%
88	LPL Financial LLC	155,993155,993	$61M	0.11%	ADD 2%
89	SEI INVESTMENTS CO	144,773144,773	$56M	0.10%	TRIM -42%
90	WELLINGTON MANAGEMENT GROUP LLP	144,377144,377	$56M	0.10%	ADD 34%
91	Bridgewater Associates, LP	143,846143,846	$56M	0.10%	TRIM -32%
92	Tidal Investments LLC	142,146142,146	$55M	0.10%	ADD 224%
93	BECKER CAPITAL MANAGEMENT INC	141,669141,669	$55M	0.10%	TRIM -29%
94	CITADEL ADVISORS LLC	140,435140,435	$55M	0.10%	TRIM -80%
95	ROYAL LONDON ASSET MANAGEMENT LTD	134,829134,829	$52M	0.10%	ADD 3566%
96	Ensign Peak Advisors, Inc	134,483134,483	$52M	0.10%	ADD 58%
97	Freestone Grove Partners LP	133,267133,267	$52M	0.09%	NEW
98	DigitalBridge Group, Inc.	132,081132,081	$51M	0.09%	TRIM -20%
99	ThornTree Capital Partners LP	130,272130,272	$51M	0.09%	TRIM -27%
100	CI INVESTMENTS INC.	128,643128,643	$50M	0.09%	TRIM -25%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

21.5M

21.3M

21.2M

21.1M

21.2M

$8.2B

BlackRock, Inc.

17.1M

17.0M

17.1M

15.6M

16.7M

13.4M

$5.2B

JPMORGAN CHASE & CO

4.4M

4.8M

5.2M

12.9M

10.9M

10.2M

$3.7B

VANGUARD CAPITAL MANAGEMENT LLC

—

9.2M

$3.6B

VANGUARD PORTFOLIO MANAGEMENT LLC

—

7.4M

$2.9B

STATE STREET CORP

4.6M

4.5M

4.4M

5.1M

6.3M

$2.4B

PRICE T ROWE ASSOCIATES INC /MD/

4.6M

1.2M

262K

2.6M

4.1M

5.2M

$2.0B

GEODE CAPITAL MANAGEMENT, LLC

2.4M

2.5M

2.7M

4.1M

$1.6B

Capital Research Global Investors

—

2.8M

$1.1B

BANK OF AMERICA CORP /DE/

3.2M

3.5M

3.1M

2.2M

2.0M

$759M

Capital World Investors

—

1.9M

1.7M

1.8M

1.9M

1.7M

$670M

Jericho Capital Asset Management L.P.

—

1.3M

2.0M

1.7M

$643M

MORGAN STANLEY

1.5M

1.9M

1.7M

1.4M

1.6M

$606M

Invesco Ltd.

333K

282K

1.2M

1.5M

$594M

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

530K

201K

50K

1.1M

2.2M

1.4M

$539M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	1,074	134,157,717	94.8%	$51.8B
2025-Q4

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · CIEN

Large holders — 13G, passive (top 5 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

QII

2026-03-31

SEC →

JPMORGAN CHASE & CO

7.7%

QII

2025-12-31

SEC →

VANGUARD CAPITAL MANAGEMENT LLC

7.47%

QII

2026-03-31

SEC →

VANGUARD PORTFOLIO MANAGEMENT LLC

5.22%

QII

2026-03-31

SEC →

VANGUARD GROUP INC

QII

CIEN US Equity☆

Institutional ownership· 13F filers holding CIEN · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · CIEN

Institutional ownership· 13F filers holding CIEN · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · CIEN

CIEN US Equity