Aldeyra Therapeutics, Inc.
US ˙ NasdaqCM ˙ US01438T1060

SecurityALDX / Aldeyra Therapeutics, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership624,170 shares
Latest Disclosed Value $ 1,054,812
Dimensional Fund Advisors Lp reports 1.95% increase in ownership of ALDX / Aldeyra Therapeutics, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 624,170 shares of Aldeyra Therapeutics, Inc. (US:ALDX) valued at $1,054,847 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 612,258 shares of Aldeyra Therapeutics, Inc.. This represents a change in shares of 1.95% during the quarter. The current value of the position is $1,160,956 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 624,170 11,912 1.95 1,055 -66.76 0.0000
2026-02-12 2025-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 612,258 -36,113 -5.57 3,171 -6.29 0.0007
2025-11-12 2025-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 648,371 -70,342 -9.79 3,384 22.97 0.0007
2025-08-12 2025-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 718,713 48,863 7.29 2,753 -28.59 0.0006
2025-05-13 2025-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 669,850 -65,913 -8.96 3,855 4.99 0.0010
2025-02-13 2024-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 735,763 131,722 21.81 3,672 12.75 0.0009
2024-11-07 2024-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 604,041 -68,016 -10.12 3,256 46.40 0.0008
2024-08-09 2024-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 672,057 -210,153 -23.82 2,225 -22.88 0.0006
2024-05-10 2024-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 882,210 -156,442 -15.06 2,885 -20.90 0.0008
2024-02-07 2023-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 1,038,652 -166,372 -13.81 3,646 -54.70 0.0011
2023-11-09 2023-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 1,205,024 79,379 7.05 8,048 -14.76 0.0026
2023-08-09 2023-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 1,125,645 2,737 0.24 9,442 -15.30 0.0030
2023-05-12 2023-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 1,122,908 232,676 26.14 11,149 185,700.00 0.0038
2023-02-09 2022-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 890,232 210,219 30.91 6 -99.83 0.0018
2022-11-10 2022-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 680,013 597,093 720.08 3,632 997.28 0.0014
2022-08-12 2022-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 82,920 -84,699 -50.53 331 -55.57 0.0001
2022-05-13 2022-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 167,619 -91,999 -35.44 745 -28.23 0.0002
2022-02-09 2021-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 259,618 -11,766 -4.34 1,038 -56.44 0.0003
2021-11-12 2021-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 271,384 0 0.00 2,383 -22.50 0.0008
2021-08-12 2021-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 271,384 -3,451 -1.26 3,075 -5.82 0.0010
2021-05-14 2021-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 274,835 6,803 2.54 3,265 77.54 0.0011
2021-03-08 2020-12-31 13F/A-2 ALDEYRA THERAPEUTICS COM 01438T106 268,032 40,190 17.64 1,839 8.95 0.0007
2021-02-11 2020-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 268,032 40,190 1,839 664.1491
2020-11-12 2020-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 227,842 18,265 8.72 1,688 93.14 0.0007
2020-08-13 2020-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 209,577 14,650 7.52 874 81.70 0.0004
2020-05-14 2020-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 194,927 -45,196 -18.82 481 -65.52 0.0003
2020-02-14 2019-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 240,123 41,739 21.04 1,395 33.49 0.0005
2019-11-12 2019-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 198,384 27,847 16.33 1,045 2.15 0.0004
2019-08-13 2019-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 170,537 170,537 1,023 0.0004
2019-08-12 2019-03-31 13F/A-2 ALDEYRA THERAPEUTICS COM 01438T106 0 -40,875 -100.00 0 -100.00
2019-02-26 2018-12-31 13F/A-1 ALDEYRA THERAPEUTICS COM 01438T106 40,875 -49,036 -54.54 339 -72.68 0.0002
2019-02-13 2018-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 40,875 -49,036 339
2018-11-13 2018-09-30 13F ALDEYRA THERAPEUTICS COM 01438T106 89,911 27,482 44.02 1,241 150.20 0.0005
2018-08-10 2018-06-30 13F ALDEYRA THERAPEUTICS COM 01438T106 62,429 0 0.00 496 5.98 0.0002
2018-05-11 2018-03-31 13F ALDEYRA THERAPEUTICS COM 01438T106 62,429 11,506 22.59 468 35.26 0.0002
2018-02-12 2017-12-31 13F ALDEYRA THERAPEUTICS COM 01438T106 50,923 50,923 346 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.