ALDX — ALDEYRA THERAPEUTICS INC

Ownership history in ARDSLEY ADVISORY PARTNERS LP  ·  23 quarters on record

AI Ownership Summary

ARDSLEY ADVISORY PARTNERS LP reported ALDEYRA THERAPEUTICS INC (ALDX) in 23 quarterly 13F filings from 2024 Q3 through 2025 Q4. Peak portfolio weight reached 1.89% in 2025 Q1. The latest visible filing shows ALDX at 0.03% 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 ALDX ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was ARDSLEY ADVISORY PARTNERS LP's position in ALDEYRA 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 Q4

ALDX was reported at 0.03% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.89% in 2025 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 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.

ALDX stock page ARDSLEY ADVISORY PARTNERS LP fund profile ARDSLEY ADVISORY PARTNERS LP full holdings
How ARDSLEY ADVISORY PARTNERS LP held ALDX — position size vs. price
% of Fund (quarterly)    ALDX price (quarter-end, indexed to 100)
📋 Quarterly Holdings History 9 quarters  ▾
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 50,000 -1,400,000 -96.6% 0.03% $259K 2026-02-14 (Est.) $5.28
2025 Q4 REDUCED 1,450,000 -450,000 -23.7% 0.82% $7.5M 2026-02-14 (Est.) $5.28
2025 Q3 REDUCED 1,900,000 -150,000 -7.3% 1.23% $9.9M 2025-11-14 $5.05
2025 Q2 ADDED 2,050,000 +1,650,000 +412.5% 1.03% $7.9M 2025-08-14 $5.30
2025 Q1 REDUCED 400,000 -1,350,000 -77.1% 0.44% $2.3M 2025-05-15 $2.16
2025 Q1 ADDED 1,750,000 +1,150,000 +191.7% 1.89% $9.9M 2025-05-15 $2.16
2024 Q4 REDUCED 600,000 -550,000 -47.8% 0.47% $3.0M 2025-02-14 $6.49
2024 Q4 ADDED 1,150,000 +650,000 +130.0% 0.91% $5.7M 2025-02-14 $6.49
2024 Q3 ADDED 500,000 +437,900 +705.2% 0.44% $2.7M 2024-11-14 $4.27
14 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding ALDX

As of 2025 Q4 — sorted by position size

Knoll Capital Management, LLC 3Y 7Y 13.01% KINGDON CAPITAL MANAGEMENT, L.L.C. 3Y 7Y 1.14% 1492 Capital Management LLC 3Y 7Y 0.44% PERCEPTIVE ADVISORS LLC 3Y 7Y 0.39% 683 Capital Management, LLC 3Y 7Y 0.34% AlphaCentric Advisors LLC 3Y 0.18% ACT CAPITAL MANAGEMENT, LLC 0.17% Palo Alto Investors LP 3Y 7Y 0.16% KENNEDY CAPITAL MANAGEMENT LLC 3Y 7Y 0.14% WOODSTOCK CORP 3Y 7Y 0.12%

FAQ About ARDSLEY ADVISORY PARTNERS LP and ALDX

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

How long has ARDSLEY ADVISORY PARTNERS LP reported owning ALDX?

ARDSLEY ADVISORY PARTNERS LP reported ALDX across 9 quarterly 13F filings, from 2024 Q3 through 2025 Q4.

What was the largest reported ALDX position in ARDSLEY ADVISORY PARTNERS LP's portfolio?

The largest reported portfolio weight for ALDX was 1.89% in 2025 Q1.

What is the latest reported ALDX position on this page?

The most recent filing on this page is 2025 Q4, when ARDSLEY ADVISORY PARTNERS LP reported 50,000 shares, equal to 0.03% of portfolio, with an estimated market value of $259K.

What does the chart on this ALDX ownership page compare?

The chart compares ARDSLEY ADVISORY PARTNERS LP's quarterly ALDX 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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