DIADEMA PARTNERS LP MREO — MEREO BIOPHARMA GROUP PLC

Ownership history in DIADEMA PARTNERS LP  ·  8 quarters on record

AI Ownership Summary

DIADEMA PARTNERS LP reported MEREO BIOPHARMA GROUP PLC (MREO) in 8 quarterly 13F filings from 2025 Q1 through 2025 Q4. Peak portfolio weight reached 1.09% in 2025 Q2. The latest visible filing shows MREO at 0.14% 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 MREO ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was DIADEMA PARTNERS LP's position in MEREO BIOPHARMA GROUP PLC, 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
2025 Q4

MREO was reported at 0.14% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.09% in 2025 Q2

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

Time in book
Holding Window
2025 Q1 to 2025 Q4

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.

MREO stock page DIADEMA PARTNERS LP fund profile DIADEMA PARTNERS LP full holdings
How DIADEMA PARTNERS LP held MREO — position size vs. price
% of Fund (quarterly)    MREO price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 8 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 ADDED — — — 1,999,500 +1,960,100 +4974.9% 0.14% $833K 2026-02-14 (Est.) $0.37
2025 Q3 REDUCED 97.4% -86.4% ✅ 39,400 -1,480,800 -97.4% 0.02% $81K 2025-11-14 $1.78
2025 Q3 ADDED — — — 1,520,200 +1,480,800 +3758.4% 0.80% $3.1M 2025-11-14 $1.78
2025 Q2 REDUCED 97.0% -27.7% ✅ 39,400 -1,278,200 -97.0% 0.03% $107K 2025-08-14 $1.71
2025 Q2 ADDED — — — 1,317,600 +1,278,200 +3244.2% 1.09% $3.6M 2025-08-14 $1.71
2025 Q1 REDUCED 92.0% +20.4% ❌ 39,400 -452,815 -92.0% 0.02% $89K 2025-05-15 $2.18
2025 Q1 REDUCED — — — 492,215 -22,985 -4.5% 0.04% $169K 2025-05-15 $2.18
2025 Q1 INITIATED — — — 515,200 — — 0.30% $1.2M 2025-05-15 $2.18

🏢 Other funds also holding MREO

As of 2026 Q1 — sorted by position size

Significant Wealth Partners LLC 0.01% SmartHarvest Portfolios, LLC 0.01% Three Magnolias Financial Advisors, LLC 0.0% Wealthspire Advisors, LLC 3Y 7Y 0.0% Astoria Portfolio Advisors LLC. 3Y 0.0% GAMMA Investing LLC 0.0% World Investment Advisors 3Y 7Y 0.0% New England Capital Financial Advisors LLC 3Y 0.0% Sound Income Strategies, LLC 3Y 7Y 0.0% SBI Securities Co., Ltd. 0.0%

FAQ About DIADEMA PARTNERS LP and MREO

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

How long has DIADEMA PARTNERS LP reported owning MREO?

DIADEMA PARTNERS LP reported MREO across 8 quarterly 13F filings, from 2025 Q1 through 2025 Q4.

What was the largest reported MREO position in DIADEMA PARTNERS LP's portfolio?

The largest reported portfolio weight for MREO was 1.09% in 2025 Q2.

What is the latest reported MREO position on this page?

The most recent filing on this page is 2025 Q4, when DIADEMA PARTNERS LP reported 1,999,500 shares, equal to 0.14% of portfolio, with an estimated market value of $833K.

What does the chart on this MREO ownership page compare?

The chart compares DIADEMA PARTNERS LP's quarterly MREO 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 DIADEMA PARTNERS LP time their MREO position?

Based on 13F filing dates vs. subsequent MREO price moves, DIADEMA PARTNERS LP correctly timed 3 out of 7 reported position changes (43%). The annualised alpha on MREO relative to SPY over the holding period was -92.3%.

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