MARSHALL WACE, LLP IOBT — IO BIOTECH INC

Ownership history in MARSHALL WACE, LLP  ·  11 quarters on record

AI Ownership Summary

MARSHALL WACE, LLP reported IO BIOTECH INC (IOBT) in 11 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 0.01% in 2023 Q4. The latest visible filing shows IOBT 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 IOBT ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was MARSHALL WACE, LLP's position in IO BIOTECH 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

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

High-water mark
Peak Conviction
0.01% in 2023 Q4

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.

IOBT stock page MARSHALL WACE, LLP fund profile MARSHALL WACE, LLP full holdings
How MARSHALL WACE, LLP held IOBT — position size vs. price
% of Fund (quarterly)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED — — — 301,291 -128,047 -29.8% 0.00% $18K 2026-05-15 $0.00
2025 Q4 REDUCED — — — 429,338 -623,293 -59.2% 0.00% $262K 2026-02-13 $0.37
2025 Q3 REDUCED — — — 1,052,631 -1,052,631 -50.0% 0.00% $379K 2025-11-14 (Est.) $0.83
2025 Q2 UNCHANGED — — — 2,105,262 — 0% 0.00% $2.9M 2025-08-14 (Est.) $1.28
2025 Q1 UNCHANGED — — — 2,105,262 — 0% 0.00% $2.3M 2025-05-15 $1.02
2024 Q4 UNCHANGED — — — 2,105,262 — 0% 0.00% $1.9M 2025-02-13 $0.94
2024 Q3 UNCHANGED — — — 2,105,262 — 0% 0.00% $2.2M 2024-11-14 $0.89
2024 Q2 UNCHANGED — — — 2,105,262 — 0% 0.00% $2.5M 2024-08-14 $1.40
2024 Q1 UNCHANGED — — — 2,105,262 — 0% 0.01% $3.7M 2024-05-15 $1.43
2023 Q4 UNCHANGED — — — 2,105,262 — 0% 0.01% $4.0M 2024-02-14 $1.61
1 older quarter hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding IOBT

As of 2026 Q1 — sorted by position size

Ikarian Capital, LLC 3Y 0.01% Marex Group plc 0.0% GSA CAPITAL PARTNERS LLP 3Y 7Y 0.0% BOOTHBAY FUND MANAGEMENT, LLC 3Y 7Y 0.0% XTX Topco Ltd 3Y 0.0% Beacon Pointe Advisors, LLC 3Y 7Y 0.0% MILLENNIUM MANAGEMENT LLC 3Y 7Y 0.0% CITIGROUP INC 3Y 7Y 0.0% MORGAN STANLEY 3Y 7Y 0.0% JANE STREET GROUP, LLC 3Y 7Y 0.0%

FAQ About MARSHALL WACE, LLP and IOBT

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

How long has MARSHALL WACE, LLP reported owning IOBT?

MARSHALL WACE, LLP reported IOBT across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported IOBT position in MARSHALL WACE, LLP's portfolio?

The largest reported portfolio weight for IOBT was 0.01% in 2023 Q4.

What is the latest reported IOBT position on this page?

The most recent filing on this page is 2026 Q1, when MARSHALL WACE, LLP reported 301,291 shares, equal to 0.00% of portfolio, with an estimated market value of $18K.

What does the chart on this IOBT ownership page compare?

The chart compares MARSHALL WACE, LLP's quarterly IOBT 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 MARSHALL WACE, LLP time their IOBT position?

Based on 13F filing dates vs. subsequent IOBT price moves, MARSHALL WACE, LLP correctly timed 3 out of 3 reported position changes (100%). The annualised alpha on IOBT relative to SPY over the holding period was -91.5%.

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