13F Pro

SEC Form 4 reporting owner

Tananbaum James B.

Tananbaum James B. has filed 12 Form 4 transactions reported between January 8, 2026 and August 10, 2026, as a reporting owner of Latigo Biotherapeutics, Inc. and Director of ALUMIS INC..

Name as filed: Tananbaum James B.

Open-market buys, 24 mo
$9.5M
3 lines
Open-market sales, 24 mo
None
reported
Companies
2
with Form 4 filings
Latest transaction
Aug 10, 2026
transaction date

Roles and reported holdings

  • LTGOLatigo Biotherapeutics, Inc.
    Aug 10, 2026

    Reporting owner

    Held indirectly (latest line)2,008,024 sh as of Aug 10, 2026 · Form 4

    24 months: $2.5M bought

  • ALMSALUMIS INC.
    Jan 8, 2026 – Apr 1, 2026

    Director

    Held indirectly (latest line)2,908,332 sh as of Jan 8, 2026 · Form 4

    24 months: $7.0M bought

Transaction history

All 12 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Aug 10, 2026LTGOConversion of derivativeCode C · indirect296,880—Form 4
Aug 10, 2026LTGOConversion of derivativeCode C · indirect195,776—Form 4
Aug 10, 2026LTGOOpen-market purchaseCode P · indirectAlso reported by Foresite Capital Management V, LLC140,000$2.5M@ $18.00Form 4
Aug 10, 2026LTGOConversion of derivativeCode C · indirect742,201—Form 4
Aug 10, 2026LTGOConversion of derivativeCode C · indirect1,125,823—Form 4
Aug 10, 2026LTGOConversion of derivativeCode C · indirect445,320—Form 4
Aug 10, 2026LTGOConversion of derivativeCode C · indirect3,117,664—Form 4
Apr 1, 2026ALMSDirectorOther acquisition or dispositionCode J · indirect680,486—Form 4
Apr 1, 2026ALMSDirectorOther acquisition or dispositionCode J · indirect1,123,337—Form 4
Apr 1, 2026ALMSDirectorOther acquisition or dispositionCode J · indirect1,176,470—Form 4
Jan 8, 2026ALMSDirectorOpen-market purchaseCode P · indirectAlso reported by Foresite Labs, LLC, Foresite Capital Management VI LLC294,117$5.0M@ $17.00Form 4
Jan 8, 2026ALMSDirectorOpen-market purchaseCode P · indirectAlso reported by Foresite Labs, LLC, Foresite Capital Management VI LLC117,647$2.0M@ $17.00Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.