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Disclosery

MAD RIVER INVESTORS: MIAX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of MAD RIVER INVESTORS on MIAX, newest first. How the timeline and the estimate are built.

MAD RIVER INVESTORS held 289,000 MIAX shares at 2026-06-30 per its 13F-HR filed 2026-08-03.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 289,000 shares
    Change vs previous 13F +207,750 shares

    4.02% of the 13F portfolio, value $10,739,240.

    13F-HR 0001384484-26-000006 filed by MAD RIVER INVESTORS
    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 81,250 shares
    Change vs previous 13F +6,200 shares

    1.14% of the 13F portfolio, value $3,162,250.

    13F-HR 0001384484-26-000004 filed by MAD RIVER INVESTORS
    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 75,050 shares
    Change vs previous 13F +450 shares

    1.52% of the 13F portfolio, value $3,330,719.

    13F-HR 0001384484-26-000002 filed by MAD RIVER INVESTORS
    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 74,600 shares
    Change vs previous 13F not available

    1.29% of the 13F portfolio, value $3,003,396.

    13F-HR 0001384484-25-000009 filed by MAD RIVER INVESTORS
    Filed (acceptance time not in the bulk data set), ingested

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