PRIMECAP MANAGEMENT CO/CA/

Position in CIEN — Ciena Corp

CIK 763212 PASADENA, CA

Position in CIEN

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$151,117,008

-$18,947,143 QoQ

Shares Held

308,050

-29.7% QoQ

Ownership

0.218%

of shares outstanding

% of Portfolio

0.09%

of 13F equity value

Holder Rank

#53

of 1,225 holders

Holding Since

Jun 2020

25 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

PRIMECAP MANAGEMENT CO/CA/ holds $1,956,659,174 across 4 Communication Equipment names. CIEN ranks #4 (7.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	HPE	Hewlett Packard Enterprise Co	17,140,875	$773,224,871
2	CSCO	Cisco Systems, Inc.	4,838,460	$568,325,511
3	ERIC	Ericsson Lm Telephone Co	41,613,613	$463,991,784
4	CIEN	Ciena Corp This page	308,050	$151,117,008

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$151,117,008	308,050	-29.7%	Shares	Sole	2026-08-14
2026-03-31	$170,064,151	438,050	-14.4%	Shares	Sole	2026-05-11
2025-12-31	$119,647,892	511,600	-12.9%	Shares	Sole	2026-02-11
2025-09-30	$85,537,424	587,200	+5.9%	Shares	Sole	2025-11-12
2025-06-30	$45,097,485	554,500	+15.9%	Shares	Sole	2025-08-11
2025-03-31	$28,918,776	478,550	+3.2%	Shares	Sole	2025-05-09
2024-12-31	$39,324,700	463,680	+263.7%	Shares	Sole	2025-02-10
2024-09-30	$7,852,725	127,500	+4.1%	Shares	Sole	2024-11-08
2024-06-30	$5,902,050	122,500	-2.5%	Shares	Sole	2024-08-09
2024-03-31	$6,215,123	125,685	+15.1%	Shares	Sole	2024-05-14
2023-12-31	$4,914,416	109,185	0.0%	Shares	Sole	2024-02-09
2023-09-30	$5,160,083	109,185	+4.5%	Shares	Sole	2023-11-13
2023-06-30	$4,439,567	104,485	+2.0%	Shares	Sole	2023-08-11
2023-03-31	$5,382,512	102,485	+1.0%	Shares	Sole	2023-05-15
2022-12-31	$5,173,705	101,485	+1.0%	Shares	Sole	2023-02-13
2022-09-30	$4,062,608	100,485	-0.1%	Shares	Sole	2022-11-14
2022-06-30	$4,596,734	100,585	-0.5%	Shares	Sole	2022-08-11
2022-03-31	$6,128,783	101,085	+2.0%	Shares	Sole	2022-05-11
2021-12-31	$7,626,572	99,085	0.0%	Shares	Sole	2022-02-11
2021-09-30	$5,088,014	99,085	+70.6%	Shares	Sole	2021-11-12
2021-06-30	$3,304,455	58,085	0.0%	Shares	Sole	2021-08-10
2021-03-31	$3,178,411	58,085	-48.8%	Shares	Sole	2021-05-14
2020-12-31	$5,999,003	113,510	+32.3%	Shares	Sole	2021-02-08
2020-09-30	$3,405,798	85,810	+1902.6%	Shares	Sole	2020-11-13
2020-06-30	$232,075	4,285	—	Shares	Sole	2020-08-13
No filing history on record for this holder in this stock.