Tekla Capital Management LLC: BIIB position timeline

Tekla Capital Management LLC held 247,943 BIIB shares at 2023-06-30 per its 13F-HR filed 2023-08-10.

the latest 13F is the newest step

1. period ended2023-06-30

   13F 247,943 shares

   Change vs previous 13F +7,017 shares

   2.76% of the 13F portfolio, value $70,626,564.

   13F-HR 0001104659-23-089542 filed by Tekla Capital Management LLC
   Filed 2023-08-10 (acceptance time not in the bulk data set), ingested 2026-10-07 18:31:37 UTC

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

2. period ended2023-03-31

   13F 240,926 shares

   Change vs previous 13F +45,496 shares

   2.55% of the 13F portfolio, value $66,984,656.

   13F-HR 0001104659-23-057966 filed by Tekla Capital Management LLC
   Filed 2023-05-10 (acceptance time not in the bulk data set), ingested 2026-10-07 18:32:36 UTC

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

3. period ended2022-12-31

   13F 195,430 shares

   Change vs previous 13F +49,991 shares

   2.04% of the 13F portfolio, value $54,118,476.

   13F-HR 0001104659-23-018131 filed by Tekla Capital Management LLC
   Filed 2023-02-10 (acceptance time not in the bulk data set), ingested 2026-10-07 18:33:21 UTC

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

4. period ended2022-09-30

   13F 145,439 shares

   Change vs previous 13F +9,800 shares

   1.59% of the 13F portfolio, value $38,832,000.

   13F-HR 0001104659-22-113331 filed by Tekla Capital Management LLC
   Filed 2022-11-01 (acceptance time not in the bulk data set), ingested 2026-10-07 18:34:10 UTC

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

5. period ended2022-06-30

   13F 135,639 shares

   Change vs previous 13F 0 shares

   1.09% of the 13F portfolio, value $27,662,000.

   13F-HR 0001104659-22-084198 filed by Tekla Capital Management LLC
   Filed 2022-07-29 (acceptance time not in the bulk data set), ingested 2026-10-07 18:35:03 UTC

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

6. period ended2022-03-31

   13F 135,639 shares

   Change vs previous 13F 0 shares

   1% of the 13F portfolio, value $28,566,000.

   13F-HR 0001104659-22-060040 filed by Tekla Capital Management LLC
   Filed 2022-05-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:35:57 UTC

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

7. period ended2021-12-31

   13F 135,639 shares

   Change vs previous 13F -98,214 shares

   1.05% of the 13F portfolio, value $32,543,000.

   13F-HR 0001104659-22-022738 filed by Tekla Capital Management LLC
   Filed 2022-02-14 (acceptance time not in the bulk data set), ingested 2026-10-07 18:36:54 UTC

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

8. period ended2021-09-30

   13F 233,853 shares

   Change vs previous 13F not available

   2.13% of the 13F portfolio, value $66,178,000.

   13F-HR 0001104659-21-137799 filed by Tekla Capital Management LLC
   Filed 2021-11-12 (acceptance time not in the bulk data set), ingested 2026-10-07 18:37:51 UTC

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