VANGUARD GROUP INC: AMPX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of VANGUARD GROUP INC on AMPX, newest first. How the timeline and the estimate are built.

VANGUARD GROUP INC held 8,219,315 AMPX shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

period ended2026-06-30
13F 8,219,315 shares
Change vs previous 13F +1,152,452 shares
<0.01% of the 13F portfolio, value $113,919,705.
13F-HR 0002100119-26-001527 filed by VANGUARD CAPITAL MANAGEMENT LLC
Filed 2026-08-13 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC
- VANGUARD FIDUCIARY TRUST CO: 989,691 shares
- Vanguard Investments Australia, Ltd.: 30,685 shares
- VANGUARD ASSET MANAGEMENT, Ltd: 83,405 shares
- Vanguard Personalized Indexing Management, LLC: 19,133 shares
- Vanguard Global Advisers, LLC: 75,787 shares
- VANGUARD CAPITAL MANAGEMENT LLC: 5,562,985 shares
- VANGUARD PORTFOLIO MANAGEMENT LLC: 1,457,629 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F/A 7,066,863 shares
Change vs previous 13F -79,750 shares
<0.01% of the 13F portfolio, value $119,147,311.
13F-HR/A 0002100119-26-001311 filed by VANGUARD CAPITAL MANAGEMENT LLC
Filed 2026-05-15 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC
- VANGUARD FIDUCIARY TRUST CO: 872,582 shares
- Vanguard Investments Australia, Ltd.: 30,685 shares
- VANGUARD ASSET MANAGEMENT, Ltd: 83,405 shares
- Vanguard Personalized Indexing Management, LLC: 23,133 shares
- Vanguard Global Advisers, LLC: 74,787 shares
- VANGUARD CAPITAL MANAGEMENT LLC: 4,908,875 shares
- VANGUARD PORTFOLIO MANAGEMENT LLC: 1,073,396 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 7,146,613 shares
Change vs previous 13F +614,355 shares
<0.01% of the 13F portfolio, value $56,386,778.
13F-HR 0000102909-26-000031 filed by VANGUARD GROUP INC
Filed 2026-01-29 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC
- VANGUARD GROUP INC: 7,128,657 shares
- Vanguard Personalized Indexing Management, LLC: 17,956 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 6,532,258 shares
Change vs previous 13F +1,757,899 shares
<0.01% of the 13F portfolio, value $68,719,354.
13F-HR 0000102909-25-000353 filed by VANGUARD GROUP INC
Filed 2025-11-07 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC
- VANGUARD GROUP INC: 6,512,620 shares
- Vanguard Personalized Indexing Management, LLC: 19,638 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-06-30
13F 4,774,359 shares
Change vs previous 13F -103,039 shares
<0.01% of the 13F portfolio, value $20,100,051.
13F-HR 0001752724-25-185843 filed by VANGUARD GROUP INC
Filed 2025-08-11 (acceptance time not in the bulk data set), ingested 2026-10-07 18:23:11 UTC
- VANGUARD GROUP INC: 4,755,225 shares
- Vanguard Personalized Indexing Management, LLC: 19,134 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-03-31
13F 4,877,398 shares
Change vs previous 13F +685,362 shares
<0.01% of the 13F portfolio, value $13,071,426.
13F-HR 0001752724-25-099331 filed by VANGUARD GROUP INC
Filed 2025-05-09 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:06 UTC
- VANGUARD GROUP INC: 4,861,137 shares
- Vanguard Personalized Indexing Management, LLC: 16,261 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-12-31
13F 4,192,036 shares
Change vs previous 13F +3,214,389 shares
<0.01% of the 13F portfolio, value $11,737,701.
13F-HR 0001752724-25-022205 filed by VANGUARD GROUP INC
Filed 2025-02-11 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:55 UTC
- VANGUARD GROUP INC: 4,178,597 shares
- Vanguard Personalized Indexing Management, LLC: 13,439 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-09-30
13F 977,647 shares
Change vs previous 13F not available
<0.01% of the 13F portfolio, value $1,085,189.
13F-HR 0001752724-24-248565 filed by VANGUARD GROUP INC
Filed 2024-11-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:26:56 UTC
- VANGUARD GROUP INC: 977,647 shares
- Vanguard Personalized Indexing Management, LLC: 0 shares
Acceptance time not in the bulk data set (spec §4.2).