What is CUSIP 171779309?

CUSIP 171779309 is the security identifier used in SEC filing datasets for CIEN - CIENA CORP - Common Stock.

Who owns CIEN - CIENA CORP - Common Stock based on 13F filings?

1069 institutions reported positions in CIEN - CIENA CORP - Common Stock as of Q1 2026. Open the latest holders period and ownership history tables on this page for position-level details.

Security Snapshot

CIENA CORP - Common Stock (CIEN) Institutional Ownership

CUSIP: 171779309

13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026

Latest Period

Q1 2026

Institutions Reporting

1,069

Shares (Excl. Options)

134,136,127

Price

$388.23

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Type / Class: Equity / Common Stock
Symbol: CIEN on NYSE
Shares outstanding: 141,483,681
Price per share: $520.80
All holders as of 31 Mar 2026: Q1 2026
Total 13F shares: 134,136,127
Total reported value: $51,755,595,059
% of total 13F portfolios: 0.03%
Share change: -7,154,237
Value change: -$2,413,182,403
Number of holders: 1,069
Price from insider filings: $520.80

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Key facts

CIEN - CIENA CORP - Common Stock is tracked under CUSIP 171779309.
1069 institutions reported positions in Q1 2026.
4 significant owners is listed from Schedule 13D/13G reporting.

Change

Holder count moved from 848 to 1,069 between Q4 2025 and Q1 2026.
Reported value moved from $32,142,374,346 to $51,755,595,059.

Research use

You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 1069 institutions filings for Q1 2026.

Open SEC Evidence

Security key

171779309

Latest holder period

Q1 2026

13F holders

1,069

13D/G owners

CIK / CUSIP context first

Open Q1 2026 holders CIEN full holder history CIENA CORP SEC filings CIENA CORP company facts CIENA CORP insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

Recent Quarterly Holder Reports

Open recent reporting periods for CUSIP 171779309:

Q1 2026 (1069 holders) Q4 2025 (848 holders) Q3 2025 (684 holders) Q2 2025 (558 holders) Q1 2025 (542 holders) Q4 2024 (533 holders) Q3 2024 (461 holders) Q2 2024 (449 holders) Q1 2024 (464 holders) Q4 2023 (448 holders)

Significant Owners of CIENA CORP - Common Stock (CIEN) based on Schedule 13D/G filings

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
BlackRock, Inc.	8%	-23%	$4,377,114,664	-$1,266,939,688	11,274,540	-22%	BlackRock, Inc.	31 Mar 2026
JPMORGAN CHASE & CO	7.7%		$2,537,894,563		10,851,732		JPMORGAN CHASE & CO.	31 Dec 2025
VANGUARD CAPITAL MANAGEMENT LLC	7.5%		$4,103,137,259		10,568,831		Vanguard Capital Management	31 Mar 2026
VANGUARD PORTFOLIO MANAGEMENT LLC	5.2%		$2,868,361,262		7,388,304		Vanguard Portfolio Management	31 Mar 2026

As of 31 Mar 2026, 1,069 institutional investors reported holding 134,136,127 shares of CIENA CORP - Common Stock (CIEN). This represents 95% of the company’s total 141,483,681 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of CIENA CORP - Common Stock (CIEN) together control 71% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution	Ownership %	Shares Held	Share Change %	Portfolio %	Holdings Value
FMR LLC	15%	21,209,756	+0.39%	0.43%	$8,234,263,456
BlackRock, Inc.	9.5%	13,373,787	-20%	0.09%	$5,192,105,090
JPMORGAN CHASE & CO	7.2%	10,226,649	-5.9%	0.25%	$3,732,727,250
VANGUARD CAPITAL MANAGEMENT LLC	6.5%	9,169,355	0%	0.09%	$3,559,818,692
VANGUARD PORTFOLIO MANAGEMENT LLC	5.2%	7,369,124	0%	0.15%	$2,860,915,011
STATE STREET CORP	4.5%	6,309,050	+24%	0.08%	$2,449,362,482
PRICE T ROWE ASSOCIATES INC /MD/	3.7%	5,242,802	+29%	0.24%	$2,035,414,000
GEODE CAPITAL MANAGEMENT, LLC	2.9%	4,065,559	+51%	0.1%	$1,576,154,861
Capital Research Global Investors	1.9%	2,750,050		0.17%	$1,067,534,801
BANK OF AMERICA CORP /DE/	1.4%	1,954,632	-9.7%	0.06%	$758,846,761
Capital World Investors	1.2%	1,724,807	-7.7%	0.09%	$669,621,822
Jericho Capital Asset Management L.P.	1.2%	1,656,172	0%	9.5%	$642,975,655
MORGAN STANLEY	1.1%	1,561,554	+13%	0.04%	$606,243,238
Invesco Ltd.	1.1%	1,530,293	+0.75%	0.09%	$594,105,652
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0.98%	1,388,477	-38%	0.29%	$539,048,426
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.9%	1,272,258	+36%	0.08%	$493,928,723
VOYA INVESTMENT MANAGEMENT LLC	0.85%	1,205,099	+27%	0.49%	$467,855,585
NORTHERN TRUST CORP	0.84%	1,187,291	-2.4%	0.06%	$460,941,986
DIMENSIONAL FUND ADVISORS LP	0.81%	1,146,020	-18%	0.09%	$444,746,223
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	0.72%	1,021,586	-48%	0.46%	$396,571,980
AQR CAPITAL MANAGEMENT LLC	0.69%	977,094	-31%	0.17%	$374,519,988
Bank of New York Mellon Corp	0.66%	926,858	-17%	0.07%	$359,833,945
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.6%	851,932	+22%	0.07%	$330,745,560
Nuveen, LLC	0.6%	844,193	-6%	0.09%	$327,741,049
LONE PINE CAPITAL LLC	0.57%	809,522		2.5%	$314,280,726

Institutional Holders of CIENA CORP - Common Stock (CIEN) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price (Median)	Investors
2026 Q1	134,136,127	$51,755,595,059	-$2,413,182,403	$652,653,453	$893,197,655	$388.23	1,069
2025 Q4	137,349,460	$32,142,374,346	+$27,721,960	$370,573,063	$472,008,191	$233.87	848
2025 Q3	139,134,046	$20,273,323,122	-$142,449,066	$189,823,185	$356,165,526	$145.67	684
2025 Q2	141,010,238	$11,468,438,045	+$481,577,370	$93,818,907	$143,012,280	$81.33	558
2025 Q1	136,482,829	$8,250,645,953	-$352,226,003	$119,777,737	$141,089,813	$60.43	542
2024 Q4	140,639,777	$11,927,949,714	-$30,379,194	$121,641,631	$165,763,864	$84.81	533
2024 Q3	142,165,351	$8,759,802,337	+$137,878,037	$39,748,799	$118,469,598	$61.59	461
2024 Q2	140,001,910	$6,745,177,951	+$143,699,694	$23,150,190	$64,421,478	$48.18	449
2024 Q1	137,161,500	$6,776,208,736	+$192,160,909	$43,358,010	$116,860,240	$49.45	464
2023 Q4	134,005,592	$6,036,621,954	-$79,214,547	$21,087,185	$36,687,651	$45.01	448
2023 Q3	134,977,056	$6,366,989,947	-$105,230,138	$25,345,538	$49,859,300	$47.26	466
2023 Q2	137,179,871	$5,828,746,458	-$80,634,569	$22,244,453	$33,843,875	$42.49	465
2023 Q1	138,682,996	$7,279,718,619	-$41,936,127	$35,041,280	$68,861,656	$52.52	480
2022 Q4	139,408,197	$7,107,065,096	-$180,505,509	$47,360,420	$76,128,024	$50.98	448
2022 Q3	144,336,104	$5,838,400,545	+$344,794,490	$34,887,750	$50,969,000	$40.43	410
2022 Q2	135,142,356	$6,176,263,763	+$21,390,413	$30,208,497	$36,771,036	$45.70	440
2022 Q1	134,228,774	$8,134,405,743	-$175,237,375	$53,416,000	$72,144,000	$60.63	480
2021 Q4	135,807,566	$10,450,586,776	-$70,604,523	$229,604,914	$137,630,000	$76.97	508
2021 Q3	136,655,447	$7,017,619,377	-$328,461,486	$143,494,500	$132,337,000	$51.35	439
2021 Q2	142,196,886	$8,088,830,406	-$63,184,128	$172,787,500	$120,717,000	$56.89	455
2021 Q1	143,076,551	$7,828,233,443	+$18,390,334	$93,630,000	$93,647,528	$54.72	446
2020 Q4	143,689,781	$7,587,963,140	+$410,394,154	$127,250,130	$182,845,350	$52.85	447
2020 Q3	137,169,579	$5,445,472,887	-$76,893,140	$105,150,000	$103,031,000	$39.69	457
2020 Q2	137,023,504	$7,420,001,250	+$30,338,737	$125,707,000	$105,952,000	$54.16	477
2020 Q1	137,025,251	$5,466,684,248	-$205,605,946	$88,954,000	$81,747,000	$39.81	407
2019 Q4	142,510,400	$6,080,361,404	+$21,201,439	$129,688,000	$104,314,000	$42.69	404
2019 Q3	142,682,103	$5,591,140,949	+$149,085,938	$110,028,000	$77,188,000	$39.23	403
2019 Q2	138,428,456	$5,690,198,088	-$185,046,026	$72,363,000	$79,277,000	$41.13	404
2019 Q1	145,690,633	$5,430,421,262	+$27,842,735	$53,742,000	$69,156,000	$37.34	408
2018 Q4	145,194,901	$4,919,874,247	-$298,271,245	$60,838,000	$70,905,000	$33.91	358
2018 Q3	153,864,710	$4,805,974,344	+$85,787,217	$66,006,000	$85,459,000	$31.24	336
2018 Q2	151,385,005	$4,011,063,102	+$68,555,358	$96,197,000	$88,704,000	$26.51	294
2018 Q1	149,043,718	$3,859,435,666	-$8,041,511	$78,123,000	$82,107,000	$25.90	296
2017 Q4	150,178,949	$3,143,475,684	-$121,805,010	$68,240,000	$86,859,000	$20.93	282
2017 Q3	153,364,478	$3,369,469,810	+$107,225,635	$71,041,000	$100,062,000	$21.97	278
2017 Q2	147,471,057	$3,690,983,516	+$22,698,351	$54,451,000	$92,087,000	$25.02	309
2017 Q1	147,288,137	$3,477,634,778	+$469,538,225	$45,850,000	$79,270,664	$23.61	285
2016 Q4	142,453,541	$3,476,632,626	+$129,800,445	$57,759,000	$110,352,000	$24.41	292
2016 Q3	137,081,009	$2,987,147,807	+$134,429,675	$69,891,000	$97,316,000	$21.80	269
2016 Q2	130,207,962	$2,441,990,256	-$109,417,708	$39,088,000	$59,549,000	$18.75	276
2016 Q1	138,574,763	$2,634,656,754	-$74,689,389	$29,633,000	$48,892,000	$19.02	260
2015 Q4	141,713,927	$2,931,455,967	+$151,612,371	$65,948,000	$93,284,000	$20.69	282
2015 Q3	134,533,506	$2,787,084,237	+$264,900,161	$71,269,000	$88,934,000	$20.72	287
2015 Q2	121,574,549	$2,878,353,382	+$149,867,111	$103,175,000	$93,228,000	$23.68	277
2015 Q1	116,194,951	$2,244,609,128	+$157,257,484	$72,598,000	$89,808,000	$19.31	243
2014 Q4	108,195,948	$2,099,739,633	+$34,778,897	$102,059,000	$142,534,000	$19.41	220
2014 Q3	108,501,484	$1,811,541,702	-$59,659,854	$73,811,000	$101,587,000	$16.72	226
2014 Q2	111,081,011	$2,404,270,993	+$81,068,235	$56,966,000	$125,636,000	$21.66	235
2014 Q1	106,880,122	$2,427,790,103	+$50,602,886	$65,592,000	$111,537,000	$22.74	260