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FRONTIER CAPITAL MANAGEMENT CO LLC: SON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of FRONTIER CAPITAL MANAGEMENT CO LLC on SON, newest first. How the timeline and the estimate are built.

FRONTIER CAPITAL MANAGEMENT CO LLC held 650,305 SON 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 650,305 shares
    Change vs previous 13F -21,293 shares

    0.34% of the 13F portfolio, value $36,644,687.

    13F-HR 0001172661-26-003509 filed by FRONTIER CAPITAL MANAGEMENT CO 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 671,598 shares
    Change vs previous 13F +27,972 shares

    0.37% of the 13F portfolio, value $36,326,736.

    13F-HR 0001172661-26-002082 filed by FRONTIER CAPITAL MANAGEMENT CO 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 643,626 shares
    Change vs previous 13F +236,349 shares

    0.3% of the 13F portfolio, value $28,087,839.

    13F-HR 0001172661-26-000845 filed by FRONTIER CAPITAL MANAGEMENT CO 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 407,277 shares
    Change vs previous 13F not available

    0.16% of the 13F portfolio, value $17,549,566.

    13F-HR 0001172661-25-004908 filed by FRONTIER CAPITAL MANAGEMENT CO LLC
    Filed (acceptance time not in the bulk data set), ingested

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