Ticker · CUSIP 01438T106
Holders (tracked)
11
Combined shares
4,218,776
Combined value
$21.85M
Last close
$1.80
Quarter
2025Q4
Price · 1Y$1.80-0.39 (-17.81%)H $5.89 · L $1.24 · Avg Vol 1.5M
Position opened
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
Price is -65.3% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
16 events
- Ken Griffin (Citadel Advisors) exited2026-02-17−152,254 shares · 2025Q4Position
- D.E. Shaw & Co. added2026-02-17+221,481 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+14,310 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−105,306 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+94,094 shares · 2025Q4Position
- +19,000 shares · 2025Q4Position
- Wellington Management trimmed2026-02-17−10,970 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−278,438 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+152,700 shares · 2025Q4Position
- AQR Capital Management added2025-11-14+31,548 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+129,759 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+217,315 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+15,579 shares · 2025Q3Position
- Wellington Management opened position2025-11-14+189,821 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+892,171 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+84,500 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ALDX…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| AQR Capital Management | 2018Q4 | $4.30 | -58.1% | $2.2M |
| D.E. Shaw & Co. | 2019Q2 | $4.77 | -62.3% | $2.9M |
| Renaissance Technologies | 2017Q1 | $4.91 | -63.4% | $630K |
| Ken Griffin (Citadel Advisors) | 2019Q1 | $5.18 | -65.2% | $416K |
| Ken Griffin (Citadel Advisors) | 2019Q1 | $5.18 | -65.2% | $416K |
| T. Rowe Price | 2021Q2 | $5.18 | -65.3% | $116K |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $5.23 | -65.6% | $79K |
| Steve Cohen (Point72) | 2019Q2 | $5.32 | -66.2% | $169K |
| Two Sigma Investments | 2018Q3 | $5.40 | -66.7% | $517K |
| Wellington Management | 2025Q1 | $5.55 | -67.6% | $322K |
| Paul Tudor Jones (Tudor Investment) | 2018Q3 | $11.52 | -84.4% | $34K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Steve Cohen (Point72)+94,094$487K
- Paul Tudor Jones (Tudor Investment)+19,000$98K
Added to3
- D.E. Shaw & Co.+221,481$1.1M
- Renaissance Technologies+152,700$791K
- Two Sigma Investments+14,310$74K
Trimmed3
- AQR Capital Management−278,438$1.4M
- Izzy Englander (Millennium Mgmt)−105,306$545K
- Wellington Management−10,970$57K
Exited1
- Ken Griffin (Citadel Advisors)−152,254$795K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 7 | $30.6M |
| 2022Q2 | 9 | $24.1M |
| 2022Q3 | 9 | $25.7M |
| 2022Q4 | 9 | $26.2M |
| 2023Q1 | 10 | $31.9M |
| 2023Q2 | 10 | $38.9M |
| 2023Q3 | 10 | $33.2M |
| 2023Q4 | 8 | $16.1M |
| 2024Q1 | 9 | $16.3M |
| 2024Q2 | 10 | $16.2M |
| 2024Q3 | 7 | $4.6M |
| 2024Q4 | 9 | $4.9M |
| 2025Q1 | 10 | $6.6M |
| 2025Q2 | 8 | $8.9M |
| 2025Q3 | 12 | $21.8M |
| 2025Q4 | 11 | $21.9M |
Who owns ALDX
11 super-investors · 2025Q4
Tracked stake
4.22M
shares
Combined value
$22M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added3Trim3Sold2Held1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | D.E. Shaw & Co. | 1.60M | $8M |
| 2 | AQR Capital Management | 1.23M | $6M |
| 3 | Renaissance Technologies | 350.0K | $2M |
| 4 | Two Sigma Investments | 287.4K | $1M |
| 5 | Ken Griffin Citadel Advisors | 231.2K | $1M |
| 6 | Wellington Management | 178.9K | $926K |
| 7 | Ken Griffin Citadel Advisors | 121.7K | $630K |
| 8 | Steve Cohen Point72 | 94.1K | $487K |
| 9 | T. Rowe Price | 64.3K | $333K |
| 10 | Izzy Englander Millennium Mgmt | 44.1K | $228K |
| 11 | Paul Tudor Jones Tudor Investment | 19.0K | $98K |
Recent moves
20 transactions
- +14,310 · 2025Q4
- −278,438 · 2025Q4
- −152,254 · 2025Q4
- +94,094 · 2025Q4
- +19,000 · 2025Q4
- −105,306 · 2025Q4
- +221,481 · 2025Q4
- −10,970 · 2025Q4
- +152,700 · 2025Q4
- +15,579 · 2025Q3
- +892,171 · 2025Q3
- +31,548 · 2025Q3
- +189,821 · 2025Q3
- +217,315 · 2025Q3
- +129,759 · 2025Q3
- +84,500 · 2025Q3
- +412 · 2025Q2
- +13,600 · 2025Q2
- −115,549 · 2025Q2
- +336,030 · 2025Q2
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