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Rubric Capital Management LP: MGTX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Rubric Capital Management LP on MGTX, newest first. How the timeline and the estimate are built.

Rubric Capital Management LP held 9,100,000 MGTX 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 9,100,000 shares
    Change vs previous 13F +2,100,000 shares

    1.13% of the 13F portfolio, value $122,941,000.

    13F-HR 0001104659-26-097098 filed by Rubric Capital Management 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 7,000,000 shares
    Change vs previous 13F +824,669 shares

    0.74% of the 13F portfolio, value $60,620,000.

    13F-HR 0001104659-26-062466 filed by Rubric Capital Management 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 6,175,331 shares
    Change vs previous 13F +2,448,880 shares

    0.59% of the 13F portfolio, value $49,093,881.

    13F-HR 0001104659-26-015172 filed by Rubric Capital Management 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 3,726,451 shares
    Change vs previous 13F 0 shares

    0.41% of the 13F portfolio, value $30,668,692.

    13F-HR 0001104659-25-112706 filed by Rubric Capital Management 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 3,726,451 shares
    Change vs previous 13F +1,950,130 shares

    0.39% of the 13F portfolio, value $24,296,461.

    13F-HR 0001104659-25-078662 filed by Rubric Capital Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2025-03-31
    13F 1,776,321 shares
    Change vs previous 13F not available

    0.22% of the 13F portfolio, value $12,043,456.

    13F-HR 0001104659-25-048481 filed by Rubric Capital Management LP
    Filed (acceptance time not in the bulk data set), ingested

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