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Disclosery

Michael J. Porro & Co. Financial Advisors, Inc.: GLW position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Michael J. Porro & Co. Financial Advisors, Inc. on GLW, newest first. How the timeline and the estimate are built.

Michael J. Porro & Co. Financial Advisors, Inc. held 20,987 GLW shares at 2026-03-31 per its 13F-HR filed 2026-10-15.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 20,987 shares
    Change vs previous 13F +500 shares

    2.24% of the 13F portfolio, value $2,853,602.

    13F-HR 0001754960-26-000885 filed by Michael J. Porro & Co. Financial Advisors, Inc.
    Accepted , ingested

  2. period ended2025-12-31
    13F 20,487 shares
    Change vs previous 13F not available

    1.5% of the 13F portfolio, value $1,793,842.

    13F-HR 0001754960-26-000818 filed by Michael J. Porro & Co. Financial Advisors, Inc.
    Accepted , ingested