GAGNON SECURITIES LLC: OSUR position timeline

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

GAGNON SECURITIES LLC held 2,799,587 OSUR 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 2,799,587 shares
Change vs previous 13F -122,244 shares
1.85% of the 13F portfolio, value $12,486,158.
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: 1,592,147 shares
- Gagnon Advisors, LLC: 1,207,440 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2026-03-31
13F 2,921,831 shares
Change vs previous 13F +144,609 shares
1.54% of the 13F portfolio, value $8,765,493.
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: 1,714,391 shares
- Gagnon Advisors, LLC: 1,207,440 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-12-31
13F 2,777,222 shares
Change vs previous 13F -24,989 shares
1.04% of the 13F portfolio, value $6,720,877.
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: 1,569,782 shares
- Gagnon Advisors, LLC: 1,207,440 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-09-30
13F 2,802,211 shares
Change vs previous 13F -9,371 shares
1.36% of the 13F portfolio, value $8,995,097.
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: 1,594,771 shares
- Gagnon Advisors, LLC: 1,207,440 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-06-30
13F 2,811,582 shares
Change vs previous 13F +940,534 shares
1.32% of the 13F portfolio, value $8,434,746.
13F-HR 0001019056-25-000196 filed by GAGNON SECURITIES LLC
Filed 2025-07-23 (acceptance time not in the bulk data set), ingested 2026-10-07 18:23:11 UTC
- GAGNON SECURITIES LLC: 1,604,142 shares
- Gagnon Advisors, LLC: 1,207,440 shares
Acceptance time not in the bulk data set (spec §4.2).
period ended2025-03-31
13F 1,871,048 shares
Change vs previous 13F not available
1.06% of the 13F portfolio, value $6,305,431.
13F-HR 0001019056-25-000173 filed by GAGNON SECURITIES LLC
Filed 2025-05-09 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:06 UTC
- GAGNON SECURITIES LLC: 1,073,771 shares
- Gagnon Advisors, LLC: 797,277 shares
Acceptance time not in the bulk data set (spec §4.2).