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Disclosery

Mainstream Capital Management LLC: GSST position timeline

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

Mainstream Capital Management LLC held 187,377 GSST 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 187,377 shares
    Change vs previous 13F +11,302 shares

    5.71% of the 13F portfolio, value $9,476,592.

    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 176,075 shares
    Change vs previous 13F +49,914 shares

    5.97% of the 13F portfolio, value $8,900,591.

    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 126,161 shares
    Change vs previous 13F +91,541 shares

    4.17% of the 13F portfolio, value $6,367,346.

    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 34,620 shares
    Change vs previous 13F not available

    1.17% of the 13F portfolio, value $1,755,234.

    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).