Sutro Biopharma Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGM:STRO Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
15 Oct 25	BuyUS$39,950	Connie Matsui	Individual	5,000	US$7.99
15 Oct 25	BuyUS$10,011	Jane Chung	Individual	1,250	US$8.01
15 Oct 25	BuyUS$15,998	Gregory Chow	Individual	1,975	US$8.10
15 Oct 25	BuyUS$13,607	Hans-Peter Gerber	Individual	1,700	US$8.00
15 Oct 25	BuyUS$9,993	David Pauling	Individual	1,250.4	US$7.99

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of STRO?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	144,194	1.69%
Hedge Funds	2,358,458	27.7%
General Public	2,641,859	31%
Institutions	3,374,880	39.6%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 65.41% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
8.78%	Affinity Asset Advisors, LLC	748,382	US$11.2m	894%	0.89%
7.62%	Suvretta Capital Management, LLC	648,832	US$9.7m	0%	0.27%
5.97%	Kynam Capital Management, LP	508,809	US$7.6m	0%	0.38%
5.31%	Millennium Management LLC	452,435	US$6.8m	-4.39%	no data
4.41%	The Vanguard Group, Inc.	375,786	US$5.6m	2.03%	no data
3.98%	Acadian Asset Management LLC	338,932	US$5.1m	11.4%	0.01%
3.66%	Velan Capital Partners LP	312,000	US$4.7m	1.96%	2.99%
3.32%	Tang Capital Management, LLC	282,871	US$4.2m	10.4%	0.13%
3.2%	MRL Ventures Fund LLC	272,350	US$4.1m	0%	2.07%
3.05%	Vestal Point Capital, LP	260,000	US$3.9m	0%	0.15%
2.69%	Eversept Partners, L.P.	229,131	US$3.4m	-0.04%	0.22%
2.58%	Samsara BioCapital LLC	219,681	US$3.3m	0%	0.3%
2.35%	Adage Capital Management, L.P.	200,000	US$3.0m	0%	no data
1.98%	BlackRock, Inc.	168,788	US$2.5m	-19.9%	no data
1.67%	Renaissance Technologies LLC	142,479	US$2.1m	56%	no data
0.96%	Geode Capital Management, LLC	82,094	US$1.2m	0.49%	no data
0.52%	Jacobs Levy Equity Management Inc	44,575	US$666.4k	0%	no data
0.51%	Dafna Capital Management, LLC	43,707	US$653.4k	0%	0.14%
0.48%	William Newell	40,906	US$611.5k	0%	no data
0.47%	Two Sigma Investments, LP	39,678	US$593.2k	245%	no data
0.41%	Fisher Asset Management, LLC	35,294	US$527.6k	0%	no data
0.41%	AQR Capital Management, LLC	34,767	US$519.8k	-65.1%	no data
0.4%	State Street Global Advisors, Inc.	34,265	US$512.3k	0%	no data
0.37%	Shay Capital LLC	31,205	US$466.5k	20.1%	0.08%
0.3%	RBC Dominion Securities Inc.	25,790	US$385.6k	16.7%	no data

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/02/02 09:10
End of Day Share Price	2026/01/30 00:00
Earnings	2025/09/30
Annual Earnings	2024/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Sutro Biopharma, Inc. is covered by 16 analysts. 10 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Zhiqiang Shu	Berenberg
Tazeen Ahmad	BofA Global Research
Thomas Shrader	BTIG