Sutro Biopharma, Inc.
Sutro Biopharma, Inc. (STRO) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · STRO · as of Jun 9, 2026
Activity summary
Buy transactions
5
P-Purchase only
Sell transactions
0
12 Months
Buy/Sell ratio
∞
Buy/Sell (by trades)
Overall sentiment
Sutro Biopharma, Inc. insiders have been net buyers of shares over the past 12 Months, which may signal confidence in the company's outlook.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 9, 2026
STRO insider buying and selling by quarter
STRO insider selling · STRO insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 9, 2026
Active insiders
Most active in past 12 months · STRO ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
STRO executive sell shares · STRO board member insider trading · STRO insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Jun 2, 2026 | Chow Gregory K. CFO | Option | 2,500 | — | Form 4 |
| Mar 4, 2026 | Pauling David Chief Admin. Ofcr. & GC | Option | 675 | — | Form 4 |
| Mar 4, 2026 | Pauling David Chief Admin. Ofcr. & GC | Other | 277 | $6K | Form 4 |
| Mar 4, 2026 | Chung Jane CEO · Director | Option | 788 | — | Form 4 |
| Mar 4, 2026 | Chung Jane CEO · Director | Other | 282 | $6K | Form 4 |
| Mar 2, 2026 | Pauling David Chief Admin. Ofcr. & GC | Option | 2,356 | — | Form 4 |
| Mar 2, 2026 | Pauling David Chief Admin. Ofcr. & GC | Other | 970 | $20K | Form 4 |
| Mar 1, 2026 | Pauling David Chief Admin. Ofcr. & GC | Option | 842 | — | Form 4 |
| Mar 1, 2026 | Pauling David Chief Admin. Ofcr. & GC | Other | 551 | $11K | Form 4 |
| Mar 1, 2026 | Pauling David Chief Admin. Ofcr. & GC | Option | 500 | — | Form 4 |
| Mar 2, 2026 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Option | 2,843 | — | Form 4 |
| Mar 2, 2026 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Other | 1,170 | $24K | Form 4 |
| Mar 1, 2026 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Option | 1,125 | — | Form 4 |
| Mar 1, 2026 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Other | 463 | $9K | Form 4 |
| Mar 2, 2026 | Chung Jane CEO · Director | Option | 7,750 | — | Form 4 |
| Mar 2, 2026 | Chung Jane CEO · Director | Other | 2,779 | $57K | Form 4 |
| Mar 1, 2026 | Chung Jane CEO · Director | Option | 2,500 | — | Form 4 |
| Mar 1, 2026 | Chung Jane CEO · Director | Other | 1,271 | $26K | Form 4 |
| Mar 1, 2026 | Chung Jane CEO · Director | Option | 688 | — | Form 4 |
| Dec 12, 2025 | Chung Jane CEO · Director | Option | 2,500 | — | Form 4 |
| Dec 12, 2025 | Chung Jane CEO · Director | Other | 894 | $7K | Form 4 |
| Oct 15, 2025 | Gerber Hans-Peter CHIEF SCIENTIFIC OFFICER | Purchase | 17,000 | $14K | Form 4 |
| Oct 15, 2025 | Chow Gregory K. CFO | Purchase | 19,750 | $16K | Form 4 |
| Oct 15, 2025 | Chung Jane CEO · Director | Purchase | 12,500 | $10K | Form 4 |
| Oct 15, 2025 | MATSUI CONNIE Director | Purchase | 50,000 | $40K | Form 4 |
Pauling David
Chief Admin. Ofcr. & GC
Date
Mar 4
Shares
277
Price
$21.31
Value
$6K
Pauling David
Chief Admin. Ofcr. & GC
Date
Mar 2
Shares
970
Price
$20.55
Value
$20K
Pauling David
Chief Admin. Ofcr. & GC
Date
Mar 1
Shares
551
Price
$20.47
Value
$11K
Gerber Hans-Peter
CHIEF SCIENTIFIC OFFICER
Date
Mar 2
Shares
2,843
Price
—
Value
—
Gerber Hans-Peter
CHIEF SCIENTIFIC OFFICER
Date
Mar 2
Shares
1,170
Price
$20.55
Value
$24K
Gerber Hans-Peter
CHIEF SCIENTIFIC OFFICER
Date
Mar 1
Shares
1,125
Price
—
Value
—
Gerber Hans-Peter
CHIEF SCIENTIFIC OFFICER
Date
Mar 1
Shares
463
Price
$20.47
Value
$9K
Gerber Hans-Peter
CHIEF SCIENTIFIC OFFICER
Date
Oct 15
Shares
17,000
Price
$0.80
Value
$14K
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About STRO insider trading
STRO insider trades
Sutro Biopharma, Inc. (STRO) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Chung Jane (CEO · Director), Pauling David (Chief Admin. Ofcr. & GC), Gerber Hans-Peter (CHIEF SCIENTIFIC OFFICER). Over the past 12 months, 5 insiders have filed transactions with the SEC. STRO insiders have been primarily buying, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Sutro Biopharma, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
STRO insider trading · 5 questionsThe insiders of Sutro Biopharma, Inc. (STRO) include executives and directors such as Chung Jane (CEO · Director), Pauling David (Chief Admin. Ofcr. & GC), Gerber Hans-Peter (CHIEF SCIENTIFIC OFFICER), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026