GAGNON SECURITIES LLC: AMPL position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GAGNON SECURITIES LLC on AMPL, newest first. How the timeline and the estimate are built.

GAGNON SECURITIES LLC held 1,690,495 AMPL shares at 2026-06-30 per its 13F-HR filed 2026-08-05.

the latest 13F is the newest step

period ended2026-06-30
13F 1,690,495 shares
Change vs previous 13F -4,328 shares
1.91% of the 13F portfolio, value $12,932,287.
13F-HR 0001019056-26-000123 filed by GAGNON SECURITIES LLC
Filed 2026-08-05 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC
- GAGNON SECURITIES LLC: 1,055,508 shares
- Gagnon Advisors, LLC: 634,987 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F 1,694,823 shares
Change vs previous 13F +538,741 shares
2.03% of the 13F portfolio, value $11,558,693.
13F-HR 0001019056-26-000076 filed by GAGNON SECURITIES LLC
Filed 2026-04-22 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC
- GAGNON SECURITIES LLC: 1,059,836 shares
- Gagnon Advisors, LLC: 634,987 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 1,156,082 shares
Change vs previous 13F +292,360 shares
2.06% of the 13F portfolio, value $13,387,430.
13F-HR 0001019056-26-000037 filed by GAGNON SECURITIES LLC
Filed 2026-02-13 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC
- GAGNON SECURITIES LLC: 698,870 shares
- Gagnon Advisors, LLC: 457,212 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 863,722 shares
Change vs previous 13F not available
1.4% of the 13F portfolio, value $9,259,100.
13F-HR 0001019056-25-000228 filed by GAGNON SECURITIES LLC
Filed 2025-11-03 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC
- GAGNON SECURITIES LLC: 510,731 shares
- Gagnon Advisors, LLC: 352,991 shares
Acceptance time not in the bulk data set (spec §4.2).