Vanguard Group Inc ownership in APH / Amphenol Corporation

Amphenol Corporation

US ˙ NYSE ˙ US0320951017

Security	APH / Amphenol Corporation
Institution	Vanguard Group Inc
Latest Disclosed Ownership	125,227,087 shares
Ownership	10.25%

2025-10-30 - Vanguard Group Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 125,227,087 shares of Amphenol Corporation (US:APH). This represents 10.25 percent ownership of the company. In their previous filing dated 2024-02-13 , Vanguard Group Inc had reported owning 73,135,372 shares, indicating an increase of 71.23 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2025-10-30	2025-10-30	13G/A	73,135,372	125,227,087	71.23	10.25	-16.12
2024-02-13	2024-02-13	13G/A	71,419,682	73,135,372	2.40	12.22	1.83
2023-02-09	2023-02-09	13G/A	64,683,170	71,419,682	10.41	12.00	10.91
2022-02-09	2022-02-09	13G/A	32,293,544	64,683,170	100.30	10.82	0.28
2021-02-10	2021-02-10	13G/A	33,149,425	32,293,544	-2.58	10.79	-3.49
2020-02-12	2020-02-12	13G/A	32,077,203	33,149,425	3.34	11.18	5.08
2019-02-11	2019-02-11	13G/A	31,186,569	32,077,203	2.86	10.64	4.21
2018-02-12	2018-02-12	13G/A	30,733,433	31,186,569	1.47	10.21	1.59
2017-08-10	2017-08-10	13G/A	28,879,505	30,733,433	6.42	10.05	7.37
2017-02-09	2017-02-09	13G/A	26,281,099	28,879,505	9.89	9.36	9.86
2016-02-10	2016-02-10	13G/A		26,281,099		8.52
2015-02-11	2015-02-11	13G/A		23,328,760		7.53
2014-02-11	2014-02-11	13G/A		10,702,954		6.76
2013-02-22	2013-02-22	13G/A		9,636,414		6.00
2013-02-11	2013-02-11	13G/A		9,636,414		5.37
2012-02-08	2012-02-08	13G/A		9,099,438		5.49

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-01-29	2025-12-31	13F	AMPHENOL CORP	CL A	032095101	126,553,498	1,322,682	1.06	17,102,440	10.36	0.2479
2025-11-07	2025-09-30	13F	AMPHENOL CORP	CL A	032095101	125,230,816	-15,302,056	-10.89	15,497,313	11.67	0.2320
2025-08-11	2025-06-30	13F	AMPHENOL CORP	CL A	032095101	140,532,872	-14,465,908	-9.33	13,877,621	36.51	0.2246
2025-05-09	2025-03-31	13F	AMPHENOL CORP	CL A	032095101	154,998,780	2,870,933	1.89	10,166,370	-3.78	0.1838
2025-02-11	2024-12-31	13F	AMPHENOL CORP	CL A	032095101	152,127,847	2,108,578	1.41	10,565,279	8.08	0.1840
2024-11-13	2024-09-30	13F	AMPHENOL CORP	CL A	032095101	150,019,269	1,179,007	0.79	9,775,256	-2.51	0.1750
2024-08-13	2024-06-30	13F	AMPHENOL CORP	CL A	032095101	148,840,262	75,380,291	102.61	10,027,368	18.34	0.1926
2024-05-10	2024-03-31	13F	AMPHENOL CORP	CL A	032095101	73,459,971	321,861	0.44	8,473,608	16.87	0.1678
2024-03-11	2023-12-31	13F/A-1	AMPHENOL CORP	CL A	032095101	73,138,110	965,951	1.34	7,250,181	19.61	0.1584
2024-02-14	2023-12-31	13F	AMPHENOL CORP	CL A	032095101	73,135,372	963,213		7,249,909		0.1376
2023-12-18	2023-09-30	13F/A-1	AMPHENOL CORP	CL A	032095101	72,172,159	90,613	0.13	6,061,740	-1.01	0.1489
2023-11-14	2023-09-30	13F	AMPHENOL CORP	CL A	032095101	72,172,159	90,613		6,061,740		0.0268
2023-08-14	2023-06-30	13F	AMPHENOL CORP	CL A	032095101	72,081,546	693,965	0.97	6,123,327	4.96	0.1452
2023-07-14	2023-03-31	13F/A-1	AMPHENOL CORP	CL A	032095101	71,387,581	-32,101	-0.04	5,833,793	7.28	0.1485
2023-05-15	2023-03-31	13F	AMPHENOL CORP	CL A	032095101	71,385,321	-34,361		5,833,608		0.1486
2023-02-10	2022-12-31	13F	AMPHENOL CORP	CL A	032095101	71,419,682	1,115,309	1.59	5,437,895	15.51	0.1481
2022-11-14	2022-09-30	13F	AMPHENOL CORP	CL A	032095101	70,304,373	499,230	0.72	4,707,581	4.75	0.1385
2022-08-12	2022-06-30	13F	AMPHENOL CORP	CL A	032095101	69,805,143	626,160	0.91	4,494,056	-13.79	0.1263
2022-05-13	2022-03-31	13F	AMPHENOL CORP	CL A	032095101	69,178,983	4,495,813	6.95	5,212,637	-7.86	0.1233
2022-02-14	2021-12-31	13F	AMPHENOL CORP	CL A	032095101	64,683,170	222,913	0.35	5,657,190	19.84	0.1284
2021-11-12	2021-09-30	13F	AMPHENOL CORP	CL A	032095101	64,460,257	457,758	0.72	4,720,426	7.81	0.1172
2021-08-13	2021-06-30	13F	AMPHENOL CORP	CL A	032095101	64,002,499	-484,496	-0.75	4,378,411	2.92	0.1090
2021-05-14	2021-03-31	13F	AMPHENOL CORP	CL A	032095101	64,486,995	32,193,451	99.69	4,254,207	0.74	0.1151
2021-02-12	2020-12-31	13F	AMPHENOL CORP	CL A	032095101	32,293,544	-475,548	-1.45	4,223,027	19.03	0.1225
2020-11-16	2020-09-30	13F	AMPHENOL CORP	CL A	032095101	32,769,092	-484,649	-1.46	3,547,911	11.36	0.1174
2020-08-14	2020-06-30	13F	AMPHENOL CORP	CL A	032095101	33,253,741	-549,762	-1.63	3,186,040	29.32	0.1130
2020-05-15	2020-03-31	13F	AMPHENOL CORP	CL A	032095101	33,803,503	654,078	1.97	2,463,599	-31.33	0.1050
2020-02-14	2019-12-31	13F	AMPHENOL CORP	CL A	032095101	33,149,425	156,529	0.47	3,587,763	12.69	0.1224
2019-11-14	2019-09-30	13F	AMPHENOL CORP	CL A	032095101	32,992,896	552,496	1.70	3,183,814	2.30	0.1181
2019-08-14	2019-06-30	13F	AMPHENOL CORP	CL A	032095101	32,440,400	398,014	1.24	3,112,332	2.85	0.1171
2019-05-15	2019-03-31	13F	AMPHENOL CORP	CL A	032095101	32,042,386	-34,817	-0.11	3,026,083	16.44	0.1187
2019-02-14	2018-12-31	13F	AMPHENOL CORP	CL A	032095101	32,077,203	663,588	2.11	2,598,895	-12.01	0.1168
2018-12-13	2018-09-30	13F/A-2	AMPHENOL CORP	CL A	032095101	31,413,615	95,433	0.30	2,953,509	8.21	0.1154
2018-11-23	2018-09-30	13F/A-1	AMPHENOL CORP	CL A	032095101	31,413,615	0		2,953,509		0.1154
2018-11-14	2018-09-30	13F	AMPHENOL CORP	CL A	032095101	31,413,615	95,433		2,953,509
2018-08-14	2018-06-30	13F	AMPHENOL CORP	CL A	032095101	31,318,182	-42,095	-0.13	2,729,380	1.05	0.1142
2018-05-15	2018-03-31	13F	AMPHENOL CORP	CL A	032095101	31,360,277	173,708	0.56	2,701,062	-1.36	0.1181
2018-02-14	2017-12-31	13F	AMPHENOL CORP	CL A	032095101	31,186,569	403,031	1.31	2,738,182	5.09	0.1197
2017-11-14	2017-09-30	13F	AMPHENOL CORP	CL A	032095101	30,783,538	223,314	0.73	2,605,519	15.50	0.1218
2017-08-24	2017-06-30	13F/A-1	AMPHENOL CORP	CL A	032095101	30,560,224	765,862	2.57	2,255,957	6.39	0.1111
2017-08-11	2017-06-30	13F	AMPHENOL CORP	CL A	032095101	30,560,224	765,862		2,255,957
2017-05-12	2017-03-31	13F	AMPHENOL CORP	CL A	032095101	29,794,362	914,857	3.17	2,120,464	9.26	0.1090
2017-02-14	2016-12-31	13F	AMPHENOL CORP	CL A	032095101	28,879,505	744,947	2.65	1,940,703	6.25	0.1083
2016-11-14	2016-09-30	13F	AMPHENOL CORP	CL A	032095101	28,134,558	719,238	2.62	1,826,495	16.21	0.1073
2016-08-10	2016-06-30	13F	AMPHENOL CORP	CL A	032095101	27,415,320	480,602	1.78	1,571,720	0.92	0.0976
2016-05-13	2016-03-31	13F	AMPHENOL CORP	CL A	032095101	26,934,718	653,619	2.49	1,557,365	13.46	0.1009
2016-02-08	2015-12-31	13F	AMPHENOL CORP	CL A	032095101	26,281,099	679,326	2.65	1,372,662	5.21	0.0923
2015-11-12	2015-09-30	13F/A-1	AMPHENOL CORP	CL A	032095101	25,601,773	569,127	2.27	1,304,667	-10.09	0.0554
2015-11-12	2015-09-30	13F/A-1	AMPHENOL CORP	CL A	032095101	25,601,773	569,127		1,304,667		0.0554
2015-11-12	2015-09-30	13F	AMPHENOL CORP	CL A	032095101	37,166,772			1,758,987
2015-08-13	2015-06-30	13F	AMPHENOL CORP	CL A	032095101	25,032,646	540,367	2.21	1,451,143	0.54	0.0981
2015-05-15	2015-03-31	13F/A-1	AMPHENOL CORP	CL A	032095101	24,492,279	1,163,519	4.99	1,443,331	14.98	0.0979
2015-05-14	2015-03-31	13F	AMPHENOL CORP	CL A	032095101	24,492,279			1,443,331
2015-02-12	2014-12-31	13F	AMPHENOL CORP	CL A	032095101	23,328,760	11,924,847	104.57	1,255,320	10.23	0.0904
2014-11-12	2014-09-30	13F	AMPHENOL CORP	CL A	032095101	11,403,913	215,728	1.93	1,138,795	5.65	0.0888
2014-08-11	2014-06-30	13F	AMPHENOL CORP	CL A	032095101	11,188,185	157,989	1.43	1,077,870	6.62	0.0849
2014-05-13	2014-03-31	13F	AMPHENOL CORP	CL A	032095101	11,030,196	327,242	3.06	1,010,918	5.91	0.0850
2014-02-12	2013-12-31	13F	AMPHENOL CORP	CL A	032095101	10,702,954	152,866	1.45	954,489	16.92	0.0839
2013-11-07	2013-09-30	13F	AMPHENOL CORP	CL A	032095101	10,550,088	129,302	1.24	816,366	0.51	0.0797
2013-08-13	2013-06-30	13F	AMPHENOL CORP	CL A	032095101	10,420,786	10,420,786		812,196		0.0853

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.