COMPANY DOSSIER

Is Sutro Biopharma laying off workers?

Not according to official filings. There is no WARN layoff notice from Sutro Biopharma in the last 12 months. The most recent was filed Sep 29, 2025 for 45 jobs in South San Francisco, California. WARN covers larger layoffs only, so smaller cuts may not appear.

119 roles affected across 5 filings.

Canary status: SingingEVIDENCE-BASED · NOT A PREDICTION
No WARN filing or SEC event in the recent window — quiet on the wire right now.
CanaryWhistle's own assessment, computed from the public filings listed on this page. It is a read of hiring and workforce activity, not a statement about Sutro Biopharma's solvency or creditworthiness. Not a credit rating and not financial advice. See our sources and method.

Filing history

Sutro Biopharma has filed 5 WARN notices in 2025, cutting 119 jobs in total. No new filings in the last 12 months. The most recent was Sep 29, 2025.

119
2025
Corporate signalsSEC · PBGC · PRIMARY SOURCES

Material corporate events on record for Sutro Biopharma, beyond the WARN notice, that fill in the wider story of a company under pressure. Each links to its official source. No other layoff tracker connects these.

Sep 29, 2025RestructuringSEC Form 8-K, Item 2.05, filed 2025-09-29 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →
Jun 2, 2025Executive ChangeSEC Form 8-K, Item 5.02, filed 2025-06-02 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →
Apr 14, 2025Executive ChangeSEC Form 8-K, Item 5.02, filed 2025-04-14 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →
Mar 13, 2025RestructuringSEC Form 8-K, Item 2.05, filed 2025-03-13 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →
Mar 13, 2025Executive ChangeSEC Form 8-K, Item 5.02, filed 2025-03-13 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →
Aug 12, 2024Executive ChangeSEC Form 8-K, Item 5.02, filed 2024-08-12 by SUTRO BIOPHARMA, INC. (STRO).SEC filing →

Every filing

South San Francisco, California
Filed Sep 29, 2025 (1y ago) · Effective Sep 30, 2025 · official filing →
45
Layoff
San Carlos, California
Filed Sep 29, 2025 (1y ago) · Effective Sep 30, 2025 · official filing →
8
Layoff
Filed Sep 29, 2025 (1y ago) · Effective Sep 30, 2025 · official filing →
1
Layoff
REMOTE · SLIVER
South San Francisco, California
Filed Mar 13, 2025 (1y ago) · Effective Aug 1, 2025 · official filing →
3
Layoff
REMOTE · SLIVER
San Carlos, California
Filed Mar 13, 2025 (1y ago) · Effective Aug 1, 2025 · official filing →
62
Layoff

Questions

Is Sutro Biopharma laying off employees?

Not according to official filings. There is no WARN layoff notice from Sutro Biopharma in the last 12 months. The most recent was filed Sep 29, 2025 for 45 jobs in South San Francisco, California. WARN covers larger layoffs only, so smaller cuts may not appear.

How many jobs is Sutro Biopharma cutting?

119 jobs across all 5 official WARN filings on record since 2025.

When do the Sutro Biopharma layoffs take effect?

The most recent filing lists an effective date of Sep 30, 2025. The WARN Act requires roughly 60 days' advance notice, so the filing date precedes the job losses.

Is Sutro Biopharma on a list you care about?

Paste your suppliers, customers or holdings at /monitor and see which of them have filed a layoff that has not happened yet. A WARN notice is filed about 60 days before the jobs go, so those are still ahead of you. Free to check, no account, and we do not store your list.

Watching Sutro Biopharma?

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