Weiss Asset Management LP HOLX — HOLOGIC INC

Ownership history in Weiss Asset Management LP  ·  5 quarters on record

AI Ownership Summary

Weiss Asset Management LP reported HOLOGIC INC (HOLX) in 5 quarterly 13F filings from 2024 Q3 through 2026 Q1. Peak portfolio weight reached 1.57% in 2026 Q1. The latest visible filing shows HOLX at 1.57% 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 HOLX ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Weiss Asset Management LP's position in HOLOGIC 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

HOLX was reported at 1.57% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.57% 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 Q3 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.

HOLX stock page Weiss Asset Management LP fund profile Weiss Asset Management LP full holdings
How Weiss Asset Management LP held HOLX — position size vs. price
% of Fund (quarterly)    HOLX price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 2 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 1,230,436 +1,042,721 +555.5% 1.57% $93.0M 2026-05-15 $76.01
2024 Q3 ADDED — — — 187,715 +134,714 +254.2% 0.35% $15.3M 2024-11-14 $77.54
3 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding HOLX

As of 2026 Q1 — sorted by position size

O'Connor Alternative Investments LLC 20.19% EQUITEC PROPRIETARY MARKETS, LLC 3Y 7Y 18.46% SYQUANT CAPITAL SAS 3Y 17.98% T3 Companies, LLC 14.69% PSquared Asset Management AG 3Y 7Y 10.68% Absolute Gestao de Investimentos Ltda. 10.4% Taconic Capital Advisors LP 3Y 7Y 8.86% EQUITEC PROPRIETARY MARKETS, LLC 3Y 7Y 8.79% FOURSIXTHREE CAPITAL LP 3Y 8.73% FOURSIXTHREE CAPITAL LP 3Y 8.73%

FAQ About Weiss Asset Management LP and HOLX

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

How long has Weiss Asset Management LP reported owning HOLX?

Weiss Asset Management LP reported HOLX across 2 quarterly 13F filings, from 2024 Q3 through 2026 Q1.

What was the largest reported HOLX position in Weiss Asset Management LP's portfolio?

The largest reported portfolio weight for HOLX was 1.57% in 2026 Q1.

What is the latest reported HOLX position on this page?

The most recent filing on this page is 2026 Q1, when Weiss Asset Management LP reported 1,230,436 shares, equal to 1.57% of portfolio, with an estimated market value of $93.0M.

What does the chart on this HOLX ownership page compare?

The chart compares Weiss Asset Management LP's quarterly HOLX 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 Weiss Asset Management LP time their HOLX position?

Based on 13F filing dates vs. subsequent HOLX price moves, Weiss Asset Management LP correctly timed 3 out of 4 reported position changes (75%).

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