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Mainstream Capital Management LLC: IBKR position timeline

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

Mainstream Capital Management LLC held 21,923 IBKR shares at 2026-06-30 per its 13F-HR filed 2026-07-15.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 21,923 shares
    Change vs previous 13F +109 shares

    1.15% of the 13F portfolio, value $1,908,178.

    13F-HR 0002043084-26-000003 filed by Mainstream Capital Management LLC
    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 21,814 shares
    Change vs previous 13F +262 shares

    0.98% of the 13F portfolio, value $1,463,065.

    13F-HR 0002043084-26-000002 filed by Mainstream Capital Management LLC
    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 21,552 shares
    Change vs previous 13F +2,171 shares

    0.91% of the 13F portfolio, value $1,386,009.

    13F-HR 0002043084-26-000001 filed by Mainstream Capital Management LLC
    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 19,381 shares
    Change vs previous 13F +1,009 shares

    0.89% of the 13F portfolio, value $1,333,607.

    13F-HR 0002043084-25-000006 filed by Mainstream Capital Management LLC
    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 18,372 shares
    Change vs previous 13F +14,071 shares

    0.74% of the 13F portfolio, value $1,017,993.

    13F-HR 0002043084-25-000004 filed by Mainstream Capital Management LLC
    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 4,301 shares
    Change vs previous 13F not available

    0.56% of the 13F portfolio, value $712,203.

    13F-HR 0002043084-25-000002 filed by Mainstream Capital Management LLC
    Filed (acceptance time not in the bulk data set), ingested

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