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Sutro Biopharma, Inc. (STRO)

Sutro Biopharma, Inc. (STRO) Insider Trading

Directors, officers and holders of more than 10% of STRO report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 185 transactions on file: 0 with code P, 0 with code S and 50 with other codes.

DateInsiderCodeShares
Sep 18, 2026Gerber Hans-PeterM Exercise3,750
Sep 18, 2026Gerber Hans-PeterM Exercise3,750
Sep 18, 2026Gerber Hans-PeterF Tax Payment1,345
Jun 5, 2026MATSUI CONNIEA Award10,000
Jun 5, 2026Lobacki Joseph MA Award10,000
Jun 5, 2026Petree Daniel HA Award10,000
Jun 5, 2026Hunter HeidiA Award10,000
Jun 5, 2026Wigginton Jon MarcA Award10,000
Jun 5, 2026Dybbs MichaelA Award10,000
Jun 5, 2026Jagpal SukhiA Award10,000
Jun 5, 2026PANEK JAMES PA Award10,000
Jun 2, 2026Chow Gregory K.M Exercise2,500
Jun 2, 2026Chow Gregory K.M Exercise2,500
Mar 4, 2026Chung JaneM Exercise788
Mar 4, 2026Chung JaneF Tax Payment282
Mar 4, 2026Pauling DavidM Exercise675
Mar 4, 2026Pauling DavidF Tax Payment277
Mar 4, 2026Chung JaneM Exercise788
Mar 4, 2026Pauling DavidM Exercise675
Mar 2, 2026Pauling DavidM Exercise2,356
Mar 2, 2026Chow Gregory K.A Award5,000
Mar 2, 2026Chung JaneA Award40,000
Mar 2, 2026Pauling DavidA Award4,200
Mar 2, 2026Chung JaneF Tax Payment2,779
Mar 2, 2026Chung JaneA Award175,000
Mar 2, 2026Pauling DavidA Award33,600
Mar 2, 2026Gerber Hans-PeterA Award40,000
Mar 2, 2026Pauling DavidF Tax Payment970
Mar 2, 2026Gerber Hans-PeterM Exercise2,843
Mar 2, 2026Chung JaneM Exercise7,750
Mar 2, 2026Chow Gregory K.A Award40,000
Mar 2, 2026Gerber Hans-PeterA Award5,000
Mar 2, 2026Gerber Hans-PeterF Tax Payment1,170
Mar 2, 2026Gerber Hans-PeterM Exercise2,843
Mar 2, 2026Pauling DavidM Exercise2,356
Mar 2, 2026Chung JaneM Exercise7,750
Mar 1, 2026Gerber Hans-PeterF Tax Payment463
Mar 1, 2026Gerber Hans-PeterM Exercise1,125
Mar 1, 2026Pauling DavidF Tax Payment551
Mar 1, 2026Pauling DavidM Exercise842
Mar 1, 2026Chung JaneM Exercise688
Mar 1, 2026Pauling DavidM Exercise500
Mar 1, 2026Pauling DavidM Exercise842
Mar 1, 2026Gerber Hans-PeterM Exercise1,125
Mar 1, 2026Chung JaneF Tax Payment1,271
Mar 1, 2026Pauling DavidM Exercise500
Mar 1, 2026Chung JaneM Exercise2,500
Mar 1, 2026Chung JaneM Exercise688
Mar 1, 2026Chung JaneM Exercise2,500
Dec 23, 2025Pauling DavidA Award7,200

The full Form 4 history is on the STRO company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.