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Disclosery

DF DENT & CO INC: ALRM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of DF DENT & CO INC on ALRM, newest first. How the timeline and the estimate are built.

DF DENT & CO INC held 187,384 ALRM 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 187,384 shares
    Change vs previous 13F -112,593 shares

    0.17% of the 13F portfolio, value $8,754,575.

    13F-HR 0000934999-26-000003 filed by DF DENT & CO INC
    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 299,977 shares
    Change vs previous 13F -110,254 shares

    0.25% of the 13F portfolio, value $12,956,020.

    13F-HR 0000934999-26-000002 filed by DF DENT & CO INC
    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 410,231 shares
    Change vs previous 13F -21,646 shares

    0.3% of the 13F portfolio, value $20,929,991.

    13F-HR 0000934999-26-000001 filed by DF DENT & CO INC
    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 431,877 shares
    Change vs previous 13F +75,898 shares

    0.3% of the 13F portfolio, value $22,924,049.

    13F-HR 0000934999-25-000008 filed by DF DENT & CO INC
    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 355,979 shares
    Change vs previous 13F +4,919 shares

    0.26% of the 13F portfolio, value $20,137,743.

    13F-HR 0000934999-25-000005 filed by DF DENT & CO INC
    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 351,060 shares
    Change vs previous 13F -6,260 shares

    0.26% of the 13F portfolio, value $19,536,467.

    13F-HR 0000934999-25-000004 filed by DF DENT & CO INC
    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 357,320 shares
    Change vs previous 13F -2,079 shares

    0.28% of the 13F portfolio, value $21,725,060.

    13F-HR 0000934999-25-000002 filed by DF DENT & CO INC
    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 359,399 shares
    Change vs previous 13F not available

    0.24% of the 13F portfolio, value $19,648,366.

    13F-HR 0000934999-24-000013 filed by DF DENT & CO INC
    Filed (acceptance time not in the bulk data set), ingested

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