PRIMECAP MANAGEMENT CO/CA/

13D and 13G Filings

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Every filing since 12/18/2024, newest first.

Issuer	Symbol	CUSIP	% of Class	Shares	Form	Filed
Southwest Airlines Co 13G/A Amendment 21 LUV · 844741108	LUV	844741108	10.0%	49,003,285	13G/A Amendment 21	10/5/2026 Event 9/30/2026
Amentum Holdings, Inc. 13G AMTM · 023939101	AMTM	023939101	5.0%	12,285,504	13G	8/6/2026 Event 6/30/2026
GRAIL, Inc. 13G/A Amendment 3 GRAL · 384747101	GRAL	384747101	5.1%	21,801,016	13G/A Amendment 3	8/6/2026 Event 6/30/2026
Booz Alllen Hamilton Holding Corporation 13G BAH · 099502106	BAH	099502106	5.3%	6,397,644	13G	8/6/2026 Event 6/30/2026
Flex Ltd. 13G/A Amendment 20 FLEX · Y2573F102	FLEX	Y2573F102	6.4%	23,358,875	13G/A Amendment 20	8/6/2026 Event 6/30/2026
MarketAxess Holdings Inc. 13G/A Amendment 3 MKTX · 57060D108	MKTX	57060D108	9.9%	3,504,905	13G/A Amendment 3	8/6/2026 Event 6/30/2026
American Airlines Group Inc. 13G/A Amendment 12 AAL · 02376R102	AAL	02376R102	10.5%	69,186,424	13G/A Amendment 12	6/5/2026 Event 5/31/2026
Xometry, Inc. 13G/A Amendment 4 XMTR · 98423F109	XMTR	98423F109	12.9%	6,495,497	13G/A Amendment 4	5/13/2026 Event 3/31/2026
Whirlpool Corporation 13G/A Amendment 10 WHR · 963320106	WHR	963320106	5.8%	3,746,368	13G/A Amendment 10	5/13/2026 Event 3/31/2026
Southwest Airlines Co. 13G/A Amendment 20 LUV · 844741108	LUV	844741108	9.6%	47,069,495	13G/A Amendment 20	5/13/2026 Event 3/31/2026
Elanco Animal Health Incorporated 13G/A Amendment 7 ELAN · 28414H103	ELAN	28414H103	9.2%	45,840,956	13G/A Amendment 7	5/13/2026 Event 3/31/2026
Xometry, Inc. 13G/A Amendment 3 XMTR · 98423F109	XMTR	98423F109	11.4%	5,682,907	13G/A Amendment 3	2/12/2026 Event 12/31/2025
Rhythm Pharmaceuticals, Inc. 13G/A Amendment 12 RYTM · 76243J105	RYTM	76243J105	5.2%	3,478,669	13G/A Amendment 12	2/12/2026 Event 12/31/2025
LivaNova PLC 13G/A Amendment 8 LIVN · G5509L101	LIVN	G5509L101	7.7%	4,224,852	13G/A Amendment 8	2/12/2026 Event 12/31/2025
Whirlpool Corporation 13G/A Amendment 9 WHR · 963320106	WHR	963320106	6.8%	3,816,068	13G/A Amendment 9	2/11/2026 Event 12/31/2025
United Airlines Holdings, Inc. 13G/A Amendment 12 UAL · 910047109	UAL	910047109	4.9%	15,978,490	13G/A Amendment 12	2/11/2026 Event 12/31/2025
Nextpower Inc. 13G/A Amendment 1 NXT · 65290E101	NXT	65290E101	4.7%	6,951,597	13G/A Amendment 1	2/11/2026 Event 12/31/2025
MarketAxess Holdings Inc. 13G/A Amendment 1 MKTX · 57060D108	MKTX	57060D108	8.5%	3,175,425	13G/A Amendment 1	2/11/2026 Event 12/31/2025
GRAIL, Inc. 13G/A Amendment 2 GRAL · 384747101	GRAL	384747101	4.7%	1,838,684	13G/A Amendment 2	2/11/2026 Event 12/31/2025
Glaukos Corporation 13G GKOS · 377322102	GKOS	377322102	5.9%	3,376,928	13G	2/11/2026 Event 12/31/2025
NetApp, Inc. 13G/A Amendment 11 NTAP · 64110D104	NTAP	64110D104	4.8%	9,630,055	13G/A Amendment 11	11/14/2025 Event 9/30/2025
Rhythm Pharmaceuticals, Inc. 13G/A Amendment 11 RYTM · 76243J105	RYTM	76243J105	6.4%	4,262,859	13G/A Amendment 11	11/14/2025 Event 9/30/2025
MarketAxess Holdings Inc. 13G MKTX · 57060D108	MKTX	57060D108	6.0%	2,230,595	13G	11/13/2025 Event 9/30/2025
Pulmonx Corporation 13G/A Amendment 6 LUNG · 745848101	LUNG	745848101	12.2%	4,956,691	13G/A Amendment 6	11/13/2025 Event 9/30/2025
Flex Ltd. 13G/A Amendment 18 FLEX · Y2573F102	FLEX	Y2573F102	7.9%	29,610,278	13G/A Amendment 18	11/13/2025 Event 9/30/2025
Biogen Inc. 13G/A Amendment 27 BIIB · 09062X103	BIIB	09062X103	10.2%	14,954,697	13G/A Amendment 27	11/13/2025 Event 9/30/2025
American Airlines Group Inc. 13G/A Amendment 11 AAL · 02376R102	AAL	02376R102	7.5%	49,641,939	13G/A Amendment 11	11/13/2025 Event 9/30/2025
Xencor, Inc. 13G/A Amendment 17 XNCR · 98401F105	XNCR	98401F105	14.8%	10,527,322	13G/A Amendment 17	8/14/2025 Event 6/30/2025
Rhythm Pharmaceuticals, Inc. 13G/A Amendment 10 RYTM · 76243J105	RYTM	76243J105	7.7%	4,878,037	13G/A Amendment 10	8/14/2025 Event 6/30/2025
Immunocore Holdings plc - ADR 13G/A Amendment 1 IMCR · 45258D105	IMCR	45258D105	7.5%	3,772,234	13G/A Amendment 1	8/14/2025 Event 6/30/2025
United Airlines Holdings, Inc. 13G/A Amendment 11 UAL · 910047109	UAL	910047109	5.8%	18,844,880	13G/A Amendment 11	8/14/2025 Event 6/30/2025
Transocean Ltd. 13G/A Amendment 7 RIG · H8817H100	RIG	H8817H100	1.5%	13,126,722	13G/A Amendment 7	8/14/2025 Event 6/30/2025
Mattel, Inc. 13G/A Amendment 10 MAT · 577081102	MAT	577081102	10.3%	33,238,861	13G/A Amendment 10	8/14/2025 Event 6/30/2025
GRAIL, Inc. 13G/A Amendment 1 GRAL · 384747101	GRAL	384747101	5.7%	2,057,089	13G/A Amendment 1	8/14/2025 Event 6/30/2025
Flex Ltd. 13G/A Amendment 17 FLEX · Y2573F102	FLEX	Y2573F102	9.0%	33,660,616	13G/A Amendment 17	8/14/2025 Event 6/30/2025
BioMarin Pharmaceutical Inc. 13G/A Amendment 25 BMRN · 09061G101	BMRN	09061G101	8.2%	15,795,383	13G/A Amendment 25	8/14/2025 Event 6/30/2025
Aecom 13G/A Amendment 10 ACM · 00766T100	ACM	00766T100	7.2%	9,580,852	13G/A Amendment 10	8/14/2025 Event 6/30/2025
Xometry, Inc. 13G/A Amendment 2 XMTR · 98423F109	XMTR	98423F109	13.0%	6,337,962	13G/A Amendment 2	5/13/2025 Event 3/31/2025
Wolfspeed, Inc. 13G/A Amendment 1 WOLF · 977852102	WOLF	977852102	4.3%	6,665,270	13G/A Amendment 1	5/13/2025 Event 3/31/2025
Rhythm Pharmaceuticals, Inc. 13G/A Amendment 9 RYTM · 76243J105	RYTM	76243J105	9.2%	5,787,322	13G/A Amendment 9	5/13/2025 Event 3/31/2025
Raymond James Financial, Inc. 13G/A Amendment 2 RJF · 754730109	RJF	754730109	4.7%	9,718,689	13G/A Amendment 2	5/13/2025 Event 3/31/2025
Pulmonx Corporation 13G/A Amendment 5 LUNG · 745848101	LUNG	745848101	13.6%	5,414,761	13G/A Amendment 5	5/13/2025 Event 3/31/2025
New Fortress Energy Inc. 13G/A Amendment 1 NFE · 644393100	NFE	644393100	4.8%	13,042,398	13G/A Amendment 1	5/13/2025 Event 3/31/2025
FedEx Corporation 13G/A Amendment 29 FDX · 31428X106	FDX	31428X106	4.98%	11,931,800	13G/A Amendment 29	5/13/2025 Event 3/31/2025
Aecom 13G/A Amendment 9 ACM · 00766T100	ACM	00766T100	8.6%	11,381,582	13G/A Amendment 9	2/13/2025 Event 12/31/2024
Rhythm Pharmaceuticals, Inc. 13G/A Amendment 8 RYTM · 76243J105	RYTM	76243J105	10.7%	6,571,190	13G/A Amendment 8	2/13/2025 Event 12/31/2024
NetApp, Inc. 13G/A Amendment 10 NTAP · 64110D104	NTAP	64110D104	6.0%	12,220,339	13G/A Amendment 10	2/13/2025 Event 12/31/2024
LivaNova PLC 13G/A Amendment 7 LIVN · G5509L101	LIVN	G5509L101	8.8%	4,754,060	13G/A Amendment 7	2/13/2025 Event 12/31/2024
Immunocore Holdings plc - ADR 13G IMCR · 45258D105	IMCR	45258D105	5.3%	2,668,550	13G	2/13/2025 Event 12/31/2024
FibroGen, Inc. 13G/A Amendment 7 FGEN · 31572Q808	FGEN	31572Q808	4.6%	4,616,130	13G/A Amendment 7	2/13/2025 Event 12/31/2024