Fairmount Funds Management LLC: JBIO position timeline

Fairmount Funds Management LLC held 4,553,494 JBIO shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

1. period ended2026-06-30

   13F 4,553,494 shares

   Change vs previous 13F 0 shares

   6.69% of the 13F portfolio, value $101,178,637.

   13F-HR 0001104659-26-096405 filed by Fairmount Funds Management LLC
   Filed 2026-08-14 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC

   Acceptance time not in the bulk data set (spec §4.2).

2. period ended2026-03-31

   13F 4,553,494 shares

   Change vs previous 13F 0 shares

   4.62% of the 13F portfolio, value $63,976,591.

   13F-HR 0001104659-26-062419 filed by Fairmount Funds Management LLC
   Filed 2026-05-15 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC

   Acceptance time not in the bulk data set (spec §4.2).

3. period ended2025-12-31

   13F 4,553,494 shares

   Change vs previous 13F +1,333,126 shares

   5.35% of the 13F portfolio, value $70,260,412.

   13F-HR 0001104659-26-016303 filed by Fairmount Funds Management LLC
   Filed 2026-02-17 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC

   Acceptance time not in the bulk data set (spec §4.2).

4. period ended2025-09-30

   13F 3,220,368 shares

   Change vs previous 13F 0 shares

   2.5% of the 13F portfolio, value $27,791,776.

   13F-HR 0001104659-25-112427 filed by Fairmount Funds Management LLC
   Filed 2025-11-14 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC

   Acceptance time not in the bulk data set (spec §4.2).

5. period ended2025-06-30

   13F 3,220,368 shares

   Change vs previous 13F not available

   4.17% of the 13F portfolio, value $32,171,476.

   13F-HR 0001104659-25-078521 filed by Fairmount Funds Management LLC
   Filed 2025-08-14 (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).