Stonebrook Private Inc. CMPX — COMPASS THERAPEUTICS INC

Ownership history in Stonebrook Private Inc.  ·  6 quarters on record

AI Ownership Summary

Stonebrook Private Inc. reported COMPASS THERAPEUTICS INC (CMPX) in 6 quarterly 13F filings from 2024 Q4 through 2026 Q1. Peak portfolio weight reached 0.01% in 2026 Q1. The latest visible filing shows CMPX 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.

What this CMPX ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Stonebrook Private Inc.'s position in COMPASS THERAPEUTICS 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

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

High-water mark
Peak Conviction
0.01% in 2026 Q1

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

Time in book
Holding Window
2024 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.

CMPX stock page Stonebrook Private Inc. fund profile Stonebrook Private Inc. full holdings
How Stonebrook Private Inc. held CMPX — position size vs. price
% of Fund (quarterly)    CMPX price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 10,365 +135 +1.3% 0.01% $55K 2026-05-11 $1.83
2025 Q4 UNCHANGED — — — 10,230 — 0% 0.01% $55K 2026-02-11 $6.44
2025 Q3 REDUCED — — — 10,230 -366 -3.5% 0.01% $36K 2025-11-10 $4.28
2025 Q2 REDUCED 13.8% +46.9% ❌ 10,596 -1,698 -13.8% 0.01% $28K 2025-08-11 $3.34
2025 Q1 ADDED — — — 12,294 +1,006 +8.9% 0.01% $23K 2025-04-30 $1.86
2024 Q4 INITIATED — — — 11,288 — — 0.00% $16K 2025-02-14 $3.38

🏢 Other funds also holding CMPX

As of 2026 Q1 — sorted by position size

Atle Fund Management AB 3Y 7Y 0.99% Optimize Financial Inc 0.21% Persistent Asset Partners Ltd 0.14% PSP Research LLC 0.11% ROYCE & ASSOCIATES LP 3Y 7Y 0.08% Y-Intercept (Hong Kong) Ltd 3Y 0.08% SmartHarvest Portfolios, LLC 0.08% TEMA ETFS LLC 0.05% Cygnus Capital Advisors, LLC 0.04% PROFUND ADVISORS LLC 3Y 7Y 0.02%

FAQ About Stonebrook Private Inc. and CMPX

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

How long has Stonebrook Private Inc. reported owning CMPX?

Stonebrook Private Inc. reported CMPX across 6 quarterly 13F filings, from 2024 Q4 through 2026 Q1.

What was the largest reported CMPX position in Stonebrook Private Inc.'s portfolio?

The largest reported portfolio weight for CMPX was 0.01% in 2026 Q1.

What is the latest reported CMPX position on this page?

The most recent filing on this page is 2026 Q1, when Stonebrook Private Inc. reported 10,365 shares, equal to 0.01% of portfolio, with an estimated market value of $55K.

What does the chart on this CMPX ownership page compare?

The chart compares Stonebrook Private Inc.'s quarterly CMPX 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 Stonebrook Private Inc. time their CMPX position?

Based on 13F filing dates vs. subsequent CMPX price moves, Stonebrook Private Inc. correctly timed 1 out of 4 reported position changes (25%). The annualised alpha on CMPX relative to SPY over the holding period was -48.6%.

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