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BAKER BROS. ADVISORS LP: IONS position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BAKER BROS. ADVISORS LP on IONS, newest first. How the timeline and the estimate are built.

BAKER BROS. ADVISORS LP held 2,047,727 IONS 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 2,047,727 shares
    Change vs previous 13F 0 shares

    0.81% of the 13F portfolio, value $162,364,274.

    13F-HR 0001104659-26-097191 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  2. period ended2026-03-31
    13F 2,047,727 shares
    Change vs previous 13F +255,886 shares

    0.88% of the 13F portfolio, value $153,763,820.

    13F-HR 0001104659-26-062547 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-12-31
    13F 1,791,841 shares
    Change vs previous 13F +1,225,043 shares

    0.83% of the 13F portfolio, value $141,752,542.

    13F-HR 0001104659-26-016374 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-09-30
    13F 566,798 shares
    Change vs previous 13F +566,798 shares

    0.27% of the 13F portfolio, value $37,079,925.

    13F-HR 0001104659-25-112595 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-06-30
    13F 0 shares
    Change vs previous 13F -357,915 shares

    13F-HR 0001104659-25-078573 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  6. period ended2025-03-31
    13F 357,915 shares
    Change vs previous 13F 0 shares

    0.12% of the 13F portfolio, value $10,798,296.

    13F-HR 0001104659-25-049518 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-12-31
    13F 357,915 shares
    Change vs previous 13F +134,445 shares

    0.13% of the 13F portfolio, value $12,512,708.

    13F-HR 0001104659-25-014085 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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

  8. period ended2024-09-30
    13F 223,470 shares
    Change vs previous 13F not available

    0.09% of the 13F portfolio, value $8,952,208.

    13F-HR 0001104659-24-118899 filed by BAKER BROS. ADVISORS LP
    Filed (acceptance time not in the bulk data set), ingested

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