MRSN β€” MERSANA THERAPEUTICS INC

Ownership history in RENAISSANCE TECHNOLOGIES LLC  Β·  23 quarters on record

AI Ownership Summary

RENAISSANCE TECHNOLOGIES LLC reported MERSANA THERAPEUTICS INC (MRSN) in 23 quarterly 13F filings from 2023 Q3 through 2025 Q3. Peak portfolio weight reached 0.01% in 2024 Q1. The latest visible filing shows MRSN at 0.00% 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 MRSN ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was RENAISSANCE TECHNOLOGIES LLC's position in MERSANA 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
2025 Q3

MRSN was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.01% 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 Q3 to 2025 Q3

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.

MRSN stock page RENAISSANCE TECHNOLOGIES LLC fund profile RENAISSANCE TECHNOLOGIES LLC full holdings
How RENAISSANCE TECHNOLOGIES LLC held MRSN β€” position size vs. price
% of Fund (quarterly)
πŸ“‹ Quarterly Holdings History 9 quarters  β–Ύ
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q3 REDUCED 88,465 -2,761,729 -96.9% 0.00% $686K 2025-11-13 β€”
2025 Q2 ADDED 2,850,194 +2,010,275 +239.3% 0.00% $844K 2025-08-13 β€”
2025 Q1 ADDED 839,919 +233,634 +38.5% 0.00% $289K 2025-05-14 β€”
2024 Q4 ADDED 606,285 +113,566 +23.0% 0.00% $867K 2025-02-13 β€”
2024 Q3 REDUCED 492,719 -955,500 -66.0% 0.00% $931K 2024-11-13 β€”
2024 Q2 ADDED 1,448,219 +20,400 +1.4% 0.00% $2.9M 2024-08-09 β€”
2024 Q1 ADDED 1,427,819 +562,088 +64.9% 0.01% $6.4M 2024-05-13 β€”
2023 Q4 REDUCED 865,731 -60,188 -6.5% 0.00% $2.0M 2024-02-13 β€”
2023 Q3 REDUCED 925,919 -122,000 -11.6% 0.00% $1.2M 2023-11-14 β€”
14 older quarters hidden  β€”  Sign in free or upgrade to Premium to see full history

🏒 Other funds also holding MRSN

As of 2025 Q4 β€” sorted by position size

Alamea Verwaltungs GmbH 2.25% Rangeley Capital, LLC 1.37% Nextech Invest, Ltd. 1.35% Bain Capital Life Sciences Investors, LLC 3Y 7Y 0.77% Yakira Capital Management, Inc. 3Y 7Y 0.32% EQUITEC PROPRIETARY MARKETS, LLC 3Y 7Y 0.25% Rock Springs Capital Management LP 3Y 7Y 0.23% Knott David M Jr 3Y 0.2% Affinity Asset Advisors, LLC 3Y 0.16% EQUITEC PROPRIETARY MARKETS, LLC 3Y 7Y 0.09%

FAQ About RENAISSANCE TECHNOLOGIES LLC and MRSN

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

How long has RENAISSANCE TECHNOLOGIES LLC reported owning MRSN?

RENAISSANCE TECHNOLOGIES LLC reported MRSN across 9 quarterly 13F filings, from 2023 Q3 through 2025 Q3.

What was the largest reported MRSN position in RENAISSANCE TECHNOLOGIES LLC's portfolio?

The largest reported portfolio weight for MRSN was 0.01% in 2024 Q1.

What is the latest reported MRSN position on this page?

The most recent filing on this page is 2025 Q3, when RENAISSANCE TECHNOLOGIES LLC reported 88,465 shares, equal to 0.00% of portfolio, with an estimated market value of $686K.

What does the chart on this MRSN ownership page compare?

The chart compares RENAISSANCE TECHNOLOGIES LLC's quarterly MRSN 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.

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