ALDX at a glance
The past year
Chart−87.7% $0.65, close Nov 13
- From the highest close
- −88.4%
- Vs the 200-day average
- −68.4%
Short interest
History3.2M shares
- Of shares outstanding
- 5.24%
- Since the last report
- −0.8%
- Days to cover
- 3.4 days
- Settled
- Oct 30, 2026
Insider buying, 7 days
Filings2 insiders bought
- Purchases
- 2
- On this week's list
- Yes
- Form 4s filed
- Nov 8 – Nov 14
Understand the Business
Why the Stock Moved
Period-matched expectations history is not yet available. Current metrics are not a substitute for a historical explanation.
ALDX price history
Loading recent earnings…
Investment thesis
What must happen next
Aldeyra’s R&D engine must produce clinically differentiated immune-mediated disease assets that regulators or partners view as approvable; otherwise the company remains a cash-burning option rather than a durable drug business.HoldingMateriality: High
Item 1 describes Aldeyra as a biotechnology company devoted to discovering innovative therapies for immune-mediated diseases. If this holds, each dollar of burn can create asymmetric drug-approval or partnership value; if it fails, the cash balance is simply consumed.
Watch: FDA feedback requiring additional large trials or rejecting the adequacy of existing clinical evidence for a lead program.
Supporting sources
Source notes are factual paraphrases; read the original disclosures below.
Item 1 describes Aldeyra as a biotechnology company devoted to discovering innovative therapies for immune-mediated diseases.
Open source ↗The balance sheet must carry Aldeyra through value-inflecting clinical, regulatory, or partnering milestones before the company is forced to finance from weakness.HoldingMateriality: High
FY2025 year-end cash was $70.0 million, up from $54.5 million at FY2024 year-end. Runway determines whether shareholders own the pipeline upside or surrender it through distressed dilution or unfavorable deal terms.
Watch: A regulator requiring an additional expensive pivotal trial before approval can be considered.
Supporting sources
Source notes are factual paraphrases; read the original disclosures below.
FY2025 year-end cash was $70.0 million, up from $54.5 million at FY2024 year-end.
Open source ↗Management has to concentrate spending on the highest-probability programs because every dollar of development and administrative burn competes directly with shareholder option value.StrengtheningMateriality: Medium
FY2025 annual GAAP operating cash flow was -$33.3 million, improved from -$43.2 million in FY2024. Disciplined burn extends the time available for value-creating events; uncontrolled burn increases the odds that dilution, not science, drives the outcome.
Watch: Management initiating multiple simultaneous late-stage trials without external funding.
Supporting sources
Source notes are factual paraphrases; read the original disclosures below.
FY2025 annual GAAP operating cash flow was -$33.3 million, improved from -$43.2 million in FY2024.
Open source ↗Aldeyra’s negotiating leverage with regulators, trial vendors, and potential partners depends on avoiding a debt-constrained balance sheet while it funds development.StrengtheningMateriality: Medium
FY2025 year-end liabilities were $27.8 million, down from $33.6 million at FY2024 year-end. A clean balance sheet preserves strategic optionality; rising obligations could force unfavorable financings, royalty deals, or partner economics.
Watch: New secured debt, royalty financing, or IP-backed borrowing becoming necessary to fund trials.
Supporting sources
Source notes are factual paraphrases; read the original disclosures below.
FY2025 year-end liabilities were $27.8 million, down from $33.6 million at FY2024 year-end.
Open source ↗
Full investment case & evidence
Loading the original research archive…
Original research
Aldeyra’s R&D engine must produce clinically differentiated immune-mediated disease assets that regulators or partners view as approvable; otherwise the company remains a cash-burning option rather than a durable drug business. If this holds, each dollar of burn can create asymmetric drug-approval or partnership value; if it fails, the cash balance is simply consumed.
The balance sheet must carry Aldeyra through value-inflecting clinical, regulatory, or partnering milestones before the company is forced to finance from weakness. Runway determines whether shareholders own the pipeline upside or surrender it through distressed dilution or unfavorable deal terms.
Management has to concentrate spending on the highest-probability programs because every dollar of development and administrative burn competes directly with shareholder option value. Disciplined burn extends the time available for value-creating events; uncontrolled burn increases the odds that dilution, not science, drives the outcome.
Aldeyra’s negotiating leverage with regulators, trial vendors, and potential partners depends on avoiding a debt-constrained balance sheet while it funds development. A clean balance sheet preserves strategic optionality; rising obligations could force unfavorable financings, royalty deals, or partner economics.
All standing thesis claims
Original report summary
its immune-mediated disease pipeline reaches regulatory or partnering validation before cash burn forces punitive financing.
Bull case and bear case
Bull case and bear case for Aldeyra Therapeutics
Where the evidence on Aldeyra Therapeutics stands: Holding on the latest evidence (Oct 14, 2026). Of its 4 thesis points, 2 strengthening and 2 holding.
Bull case: what the evidence supports
Aldeyra’s R&D engine must produce clinically differentiated immune-mediated disease assets that regulators or partners view as approvable; otherwise the company remains a cash-burning option rather than a durable drug business.
The balance sheet must carry Aldeyra through value-inflecting clinical, regulatory, or partnering milestones before the company is forced to finance from weakness.
Management has to concentrate spending on the highest-probability programs because every dollar of development and administrative burn competes directly with shareholder option value.
Aldeyra’s negotiating leverage with regulators, trial vendors, and potential partners depends on avoiding a debt-constrained balance sheet while it funds development.
Bear case: what would count against it
FDA feedback requiring additional large trials or rejecting the adequacy of existing clinical evidence for a lead program.
A regulator requiring an additional expensive pivotal trial before approval can be considered.
Management initiating multiple simultaneous late-stage trials without external funding.
Thesis-Break Engine
Thesis-break watch · Aldeyra Therapeutics
No break has crossed Aldeyra Therapeutics’s thesis. Its break conditions are checked against every new filing as it lands.
MARKET + FINANCIAL SNAPSHOT
The numbers behind the thesis
What Changed
- MixedRegulation FD disclosure.
Aldeyra Therapeutics filed an SEC 8-K on 2026-09-29: Regulation FD disclosure. It is a dated development that tests the current thesis.
- MixedEntered a material definitive agreement.
Aldeyra Therapeutics filed an SEC 8-K on 2026-07-30: Entered a material definitive agreement. It is a dated development that tests the current thesis.
- MixedOther material event.
Aldeyra Therapeutics filed an SEC 8-K on 2026-07-15: Other material event. It is a dated development that tests the current thesis.
Risks / falsifiers
What could break the thesis
- FDA feedback requiring additional large trials or rejecting the adequacy of existing clinical evidence for a lead program.
- A regulator requiring an additional expensive pivotal trial before approval can be considered.
- Management initiating multiple simultaneous late-stage trials without external funding.
- New secured debt, royalty financing, or IP-backed borrowing becoming necessary to fund trials.
ALDX news
Loading headlines…
Financial statements
ALDX income statement
Annual filed results · USD · Oldest to newest. Margins are calculated from the reported figures.
ALDX: quick answers
- What is ALDX's short interest?
- As of October 30, 2026, 3.2M ALDX shares were sold short, 5.24% of its shares outstanding, down 0.8% from the count before. At the stock's average daily volume that is 3.4 days to cover. FINRA publishes the count twice a month. ALDX short interest history

