VANGUARD GROUP INC: AMSC position timeline

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

VANGUARD GROUP INC held 3,853,877 AMSC 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 3,853,877 shares
Change vs previous 13F -282,584 shares
<0.01% of the 13F portfolio, value $159,974,434.
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: 337,929 shares
- Vanguard Investments Australia, Ltd.: 11,822 shares
- VANGUARD ASSET MANAGEMENT, Ltd: 32,589 shares
- Vanguard Global Advisers, LLC: 18,455 shares
- VANGUARD CAPITAL MANAGEMENT LLC: 2,034,219 shares
- VANGUARD PORTFOLIO MANAGEMENT LLC: 1,418,863 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F/A 4,136,461 shares
Change vs previous 13F +609,829 shares
<0.01% of the 13F portfolio, value $140,019,205.
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: 326,042 shares
- Vanguard Investments Australia, Ltd.: 10,492 shares
- VANGUARD ASSET MANAGEMENT, Ltd: 29,288 shares
- Vanguard Global Advisers, LLC: 19,494 shares
- VANGUARD CAPITAL MANAGEMENT LLC: 2,039,468 shares
- VANGUARD PORTFOLIO MANAGEMENT LLC: 1,711,677 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 3,526,632 shares
Change vs previous 13F +573,446 shares
<0.01% of the 13F portfolio, value $101,496,470.
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: 3,526,632 shares
- Vanguard Personalized Indexing Management, LLC: 0 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 2,953,186 shares
Change vs previous 13F +506,139 shares
<0.01% of the 13F portfolio, value $175,389,716.
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: 2,949,801 shares
- Vanguard Personalized Indexing Management, LLC: 3,385 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-06-30
13F 2,447,047 shares
Change vs previous 13F +159,462 shares
<0.01% of the 13F portfolio, value $89,782,154.
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
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-03-31
13F 2,287,585 shares
Change vs previous 13F +64,650 shares
<0.01% of the 13F portfolio, value $41,496,791.
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
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-12-31
13F 2,222,935 shares
Change vs previous 13F -203,343 shares
<0.01% of the 13F portfolio, value $54,750,889.
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
Acceptance time not in the bulk data set (spec §4.2).
period ended2024-09-30
13F 2,426,278 shares
Change vs previous 13F not available
<0.01% of the 13F portfolio, value $57,260,161.
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
Acceptance time not in the bulk data set (spec §4.2).