ACADIAN ASSET MANAGEMENT LLC STRO — SUTRO BIOPHARMA INC

Ownership history in ACADIAN ASSET MANAGEMENT LLC  ·  29 quarters on record

AI Ownership Summary

ACADIAN ASSET MANAGEMENT LLC reported SUTRO BIOPHARMA INC (STRO) in 29 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 0.02% in 2024 Q1. The latest visible filing shows STRO at 0.01% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.

What this STRO ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was ACADIAN ASSET MANAGEMENT LLC's position in SUTRO BIOPHARMA INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

STRO was reported at 0.01% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.02% in 2024 Q1

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q4 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

STRO stock page ACADIAN ASSET MANAGEMENT LLC fund profile ACADIAN ASSET MANAGEMENT LLC full holdings
How ACADIAN ASSET MANAGEMENT LLC held STRO — position size vs. price
% of Fund (quarterly)    STRO price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED — — — 335,813 -2,140 -0.6% 0.01% $8K 2026-05-13 $39.60
2025 Q4 REDUCED 90.0% +115.3% ❌ 337,953 -3,051,369 -90.0% 0.01% $3.9M 2026-02-10 $15.64
2025 Q3 ADDED — — — 3,389,322 +347,084 +11.4% 0.01% $2.9M 2025-11-14 (Est.) $9.00
2025 Q2 REDUCED — — — 3,042,238 -92,348 -2.9% 0.00% $2.2M 2025-08-14 (Est.) $7.80
2025 Q1 ADDED — — — 3,134,586 +1,382,661 +78.9% 0.01% $2.0M 2025-05-21 $8.40
2024 Q4 ADDED — — — 1,751,925 +142,051 +8.8% 0.01% $3.2M 2025-02-11 $16.30
2024 Q3 ADDED — — — 1,609,874 +34,916 +2.2% 0.02% $5.6M 2024-11-12 $40.80
2024 Q2 ADDED — — — 1,574,958 +370,705 +30.8% 0.01% $4.6M 2024-08-06 $32.80
2024 Q1 ADDED — — — 1,204,253 +281,224 +30.5% 0.02% $6.8M 2024-05-10 $41.50
2023 Q4 ADDED — — — 923,029 +149,162 +19.3% 0.02% $4.0M 2024-02-13 $45.30
19 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding STRO

As of 2026 Q1 — sorted by position size

Velan Capital Investment Management LP 3Y 7.99% ACUTA CAPITAL PARTNERS, LLC 3Y 7Y 4.73% KVP Capital Advisors, LP 4.22% Samsara BioCapital, LLC 3Y 7Y 2.57% Merck & Co., Inc. 1.94% AJU IB Investment Co., Ltd. 3Y 1.43% Affinity Asset Advisors, LLC 3Y 1.38% Kynam Capital Management, LP 3Y 1.34% BVF INC/IL 3Y 7Y 0.99% Opaleye Management Inc. 3Y 7Y 0.63%

FAQ About ACADIAN ASSET MANAGEMENT LLC and STRO

These are the practical questions this page is built to answer before you even open the full history table.

How long has ACADIAN ASSET MANAGEMENT LLC reported owning STRO?

ACADIAN ASSET MANAGEMENT LLC reported STRO across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported STRO position in ACADIAN ASSET MANAGEMENT LLC's portfolio?

The largest reported portfolio weight for STRO was 0.02% in 2024 Q1.

What is the latest reported STRO position on this page?

The most recent filing on this page is 2026 Q1, when ACADIAN ASSET MANAGEMENT LLC reported 335,813 shares, equal to 0.01% of portfolio, with an estimated market value of $8K.

What does the chart on this STRO ownership page compare?

The chart compares ACADIAN ASSET MANAGEMENT LLC's quarterly STRO portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did ACADIAN ASSET MANAGEMENT LLC time their STRO position?

Based on 13F filing dates vs. subsequent STRO price moves, ACADIAN ASSET MANAGEMENT LLC correctly timed 15 out of 28 reported position changes (54%). The annualised alpha on STRO relative to SPY over the holding period was -24.9%.

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