Latest Period
Q1 2026
Security Snapshot
Sutro Biopharma, Inc. - Common Stock, $0.001 par value per share (STRO) Institutional Ownership
CUSIP: 869367102
13F Institutional Holders and Ownership History from Q3 2018 to Q1 2026
Institutions Reporting
7
Shares (Excl. Options)
290,038
Price
$24.91
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- Security type / class
- Equity / Common Stock, $0.001 par value per share
- Symbol
- STRO on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 290,038
- Total 13F value
- $7,224,847
- Portfolio coverage rank
- 0%
- Share change
- -1
- Value change
- +$29
- Number of holders
- 7
- Shares outstanding
- 16,607,375
- SEC-reported price per share
- $24.91
- Insider filing price
- $24.91
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- STRO - Sutro Biopharma, Inc. - Common Stock, $0.001 par value per share is tracked under CUSIP 869367102.
- 7 institutions reported positions in Q1 2026.
- 7 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 7 to 7 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $3,355,752 to $7,224,847.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 7 institutions filings for Q1 2026.
Security key
869367102
Latest holder period
Q1 2026
13F holders
7
13D/G owners
7
CIK / CUSIP context first
Open Q1 2026 holders
STRO full holder history
SUTRO BIOPHARMA, INC. SEC filings
SUTRO BIOPHARMA, INC. company facts
SUTRO BIOPHARMA, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 869367102:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
7
Security
STRO
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | 4.9% | $2,937,877 | 4,115,250 | The Vanguard Group | 30 Jun 2025 | |||
| BlackRock, Inc. | 2.5% | -69% | $1,493,679 | -$2,892,242 | 2,092,281 | -66% | BlackRock, Inc. | 30 Jun 2025 |
| Affinity Asset Advisors, LLC | 6.5% | -16% | $26,642,467 | -$137,363,902 | 1,069,519 | -84% | Affinity Asset Advisors, LLC | 31 Mar 2026 |
| Samsara BioCapital, L.P. | 6.4% | $26,476,886 | 1,062,872 | Srinivas Akkaraju | 11 Feb 2026 | |||
| Point72 Asset Management, L.P. | 5.7% | $23,590,623 | 946,829 | Point72 Asset Management, L.P. | 24 Apr 2026 | |||
| PERCEPTIVE ADVISORS LLC | 5.4% | $22,370,431 | 898,025 | Perceptive Advisors LLC | 14 Apr 2026 | |||
| MILLENNIUM MANAGEMENT LLC | 1.3% | -72% | $5,240,663 | -$112,268,464 | 210,378 | -96% | Millennium Management LLC | 31 Mar 2026 |
As of 31 Mar 2026, 7 institutional investors reported holding 290,038 shares of Sutro Biopharma, Inc. - Common Stock, $0.001 par value per share (STRO). This represents 1.7% of the company’s total 16,607,375 outstanding shares.
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
31
Latest
Q1 2026
Rows shown
1-25 of 31
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 290,038 | $7,224,847 | +$29 | $24.91 | 7 |
| 2025 Q4 | 290,039 | $3,355,752 | -$74,010,412 | $11.57 | 7 |
| 2025 Q3 | 53,354,083 | $46,329,126 | -$1,641,183 | $0.87 | 84 |
| 2025 Q2 | 55,585,121 | $39,680,994 | -$3,651,726 | $0.71 | 100 |
| 2025 Q1 | 61,457,334 | $39,985,859 | -$10,841,219 | $0.65 | 113 |
| 2024 Q4 | 63,895,959 | $117,565,386 | -$7,306,459 | $1.84 | 122 |
| 2024 Q3 | 62,516,525 | $216,373,636 | -$1,660,759 | $3.46 | 130 |
| 2024 Q2 | 63,167,394 | $185,075,042 | +$25,139,079 | $2.93 | 119 |
| 2024 Q1 | 53,412,221 | $301,719,025 | +$2,094,339 | $5.65 | 116 |
| 2023 Q4 | 55,648,249 | $238,729,642 | -$219,480 | $4.29 | 113 |
| 2023 Q3 | 55,996,442 | $194,308,615 | +$5,622,550 | $3.47 | 108 |
| 2023 Q2 | 54,105,078 | $251,585,717 | +$2,181,872 | $4.65 | 119 |
| 2023 Q1 | 53,720,779 | $247,499,715 | +$10,470,599 | $4.62 | 114 |
| 2022 Q4 | 49,984,035 | $403,859,817 | +$6,296,600 | $8.08 | 116 |
| 2022 Q3 | 50,396,383 | $279,697,401 | +$23,514,794 | $5.55 | 111 |
| 2022 Q2 | 46,245,672 | $240,931,373 | +$15,713,924 | $5.21 | 111 |
| 2022 Q1 | 41,606,389 | $341,990,813 | -$38,514,469 | $8.22 | 111 |
| 2021 Q4 | 39,677,298 | $590,411,817 | -$4,363,219 | $14.88 | 114 |
| 2021 Q3 | 39,817,120 | $752,214,523 | -$26,368,206 | $18.89 | 119 |
| 2021 Q2 | 41,241,047 | $766,657,023 | -$71,886,996 | $18.59 | 121 |
| 2021 Q1 | 44,209,991 | $1,005,487,689 | +$114,863,310 | $22.76 | 136 |
| 2020 Q4 | 39,392,744 | $855,224,796 | +$184,675,658 | $21.71 | 132 |
| 2020 Q3 | 31,151,440 | $313,088,624 | +$67,545,691 | $10.05 | 87 |
| 2020 Q2 | 23,997,579 | $186,238,799 | +$97,614,730 | $7.76 | 76 |
| 2020 Q1 | 11,868,607 | $116,270,683 | +$7,872,102 | $10.20 | 60 |