PRIMECAP MANAGEMENT CO/CA/

Position in AMBA — Ambarella Inc

CIK 763212 PASADENA, CA

Position in AMBA

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

Position Value

$1,638,780

+$640,068 QoQ

Shares Held

19,100

-1.5% QoQ

Ownership

0.044%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#107

of 336 holders

Holding Since

Sep 2020

24 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

PRIMECAP MANAGEMENT CO/CA/ holds $8,982,386,145 across 9 Semiconductor Equipment & Materials names. AMBA ranks #9 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	KLAC	Kla Corp	20,536,730	$6,196,136,808
2	AMAT	Applied Materials Inc /De	1,042,926	$754,035,498
3	ASML	Asml Holding NV	351,576	$699,439,322
4	ENTG	Entegris Inc	3,125,433	$562,140,379
5	FORM	Formfactor Inc	1,690,114	$270,299,932
6	TER	Teradyne, Inc	485,840	$235,068,825
7	Q	Qnity Electronics, Inc.	906,109	$147,976,660
8	ACLS	Axcelis Technologies Inc	610,451	$115,649,941

24 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$1,638,780	19,100	-1.5%	Shares	Sole	2026-08-14
2026-03-31	$998,712	19,400	-0.5%	Shares	Sole	2026-05-11
2025-12-31	$1,381,380	19,500	-6.7%	Shares	Sole	2026-02-11
2025-09-30	$1,724,668	20,900	-4.6%	Shares	Sole	2025-11-12
2025-06-30	$1,446,933	21,900	-13.4%	Shares	Sole	2025-08-11
2025-03-31	$1,273,349	25,300	-1.9%	Shares	Sole	2025-05-09
2024-12-31	$1,876,692	25,800	-12.2%	Shares	Sole	2025-02-10
2024-09-30	$1,658,454	29,400	-2.3%	Shares	Sole	2024-11-08
2024-06-30	$1,623,895	30,100	-3.8%	Shares	Sole	2024-08-09
2024-03-31	$1,589,101	31,300	0.0%	Shares	Sole	2024-05-14
2023-12-31	$1,918,377	31,300	-5.4%	Shares	Sole	2024-02-09
2023-09-30	$1,755,293	33,100	0.0%	Shares	Sole	2023-11-13
2023-06-30	$2,769,477	33,100	-63.5%	Shares	Sole	2023-08-11
2023-03-31	$7,014,252	90,600	-0.9%	Shares	Sole	2023-05-15
2022-12-31	$7,515,822	91,400	-19.6%	Shares	Sole	2023-02-13
2022-09-30	$6,387,666	113,700	0.0%	Shares	Sole	2022-11-14
2022-06-30	$7,442,802	113,700	-16.2%	Shares	Sole	2022-08-11
2022-03-31	$14,227,152	135,600	-6.6%	Shares	Sole	2022-05-11
2021-12-31	$29,447,454	145,140	-17.0%	Shares	Sole	2022-02-11
2021-09-30	$27,238,926	174,900	-45.0%	Shares	Sole	2021-11-12
2021-06-30	$33,929,666	318,200	+7.5%	Shares	Sole	2021-08-10
2021-03-31	$29,715,440	296,000	-1.0%	Shares	Sole	2021-05-14
2020-12-31	$27,454,180	299,000	+67.6%	Shares	Sole	2021-02-08
2020-09-30	$9,308,912	178,400	—	Shares	Sole	2020-11-13
No filing history on record for this holder in this stock.