Ticker · CUSIP 039697107
Holders (tracked)
13
Combined shares
23,303,529
Combined value
$135.86M
Last close
$6.45
Quarter
2025Q4
Price · 1Y$6.45+1.63 (+33.96%)H $7.99 · L $3.28 · Avg Vol 4.2M
Tracked holders · last 8 quarters
+2 vs previous quarter over the last 8.
Price is +10.6% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
17 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−201,079 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+383,121 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−1,901,783 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+4,267,524 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+958,690 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+7,146 shares · 2025Q4Position
- +123,410 shares · 2025Q4Position
- Wellington Management trimmed2026-02-17−2,479 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−119,041 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+104,700 shares · 2025Q4Position
- Wellington Management added2025-11-14+4,967 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−4,021,242 shares · 2025Q3Position
- AQR Capital Management trimmed2025-11-14−168,239 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+469,385 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+854,384 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+20,069 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+388,900 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ARDX…
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 |
|---|---|---|---|---|
| Steve Cohen (Point72) | 2020Q3 | $0.74 | +777.4% | $6.2M |
| Renaissance Technologies | 2016Q3 | $4.78 | +35.0% | $11.6M |
| D.E. Shaw & Co. | 2016Q1 | $4.96 | +29.9% | $9.1M |
| AQR Capital Management | 2018Q2 | $5.05 | +27.8% | $13.1M |
| Two Sigma Investments | 2018Q1 | $5.29 | +22.0% | $18.5M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $5.75 | +12.2% | $1.5M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $5.75 | +12.2% | $1.5M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $5.75 | +12.2% | $1.5M |
| Izzy Englander (Millennium Mgmt) | 2016Q3 | $5.83 | +10.7% | $76.8M |
| Izzy Englander (Millennium Mgmt) | 2016Q3 | $5.83 | +10.7% | $76.8M |
| Wellington Management | 2018Q2 | $6.17 | +4.6% | $646K |
| Paul Tudor Jones (Tudor Investment) | 2017Q2 | $6.33 | +2.0% | $796K |
| T. Rowe Price | 2016Q1 | $6.46 | -0.2% | $1.5M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Steve Cohen (Point72)+958,690$5.6M
- Paul Tudor Jones (Tudor Investment)+123,410$719K
Added to4
- Izzy Englander (Millennium Mgmt)+4,267,524$24.9M
- Two Sigma Investments+383,121$2.2M
- Renaissance Technologies+104,700$610K
- T. Rowe Price+7,146$42
Trimmed4
- D.E. Shaw & Co.−1,901,783$11.1M
- Ken Griffin (Citadel Advisors)−201,079$1.2M
- AQR Capital Management−119,041$694K
- Wellington Management−2,479$14K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 6 | $9.3M |
| 2022Q2 | 9 | $5.4M |
| 2022Q3 | 7 | $6.0M |
| 2022Q4 | 9 | $55.0M |
| 2023Q1 | 10 | $116.1M |
| 2023Q2 | 9 | $88.5M |
| 2023Q3 | 9 | $88.4M |
| 2023Q4 | 7 | $126.7M |
| 2024Q1 | 10 | $192.4M |
| 2024Q2 | 10 | $192.5M |
| 2024Q3 | 9 | $67.9M |
| 2024Q4 | 10 | $55.8M |
| 2025Q1 | 11 | $81.2M |
| 2025Q2 | 11 | $90.1M |
| 2025Q3 | 11 | $108.8M |
| 2025Q4 | 13 | $135.9M |
Who owns ARDX
13 super-investors · 2025Q4
Tracked stake
23.30M
shares
Combined value
$136M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added5Trim6
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Izzy Englander Millennium Mgmt | 11.91M | $69M |
| 2 | Two Sigma Investments | 2.87M | $17M |
| 3 | AQR Capital Management | 2.03M | $12M |
| 4 | Renaissance Technologies | 1.79M | $10M |
| 5 | D.E. Shaw & Co. | 1.41M | $8M |
| 6 | Ken Griffin Citadel Advisors | 1.33M | $8M |
| 7 | Steve Cohen Point72 | 958.7K | $6M |
| 8 | T. Rowe Price | 234.5K | $1M |
| 9 | Ken Griffin Citadel Advisors | 231.8K | $1M |
| 10 | Ken Griffin Citadel Advisors | 220.1K | $1M |
| 11 | Paul Tudor Jones Tudor Investment | 123.4K | $719K |
| 12 | Wellington Management | 100.1K | $584K |
| 13 | Izzy Englander Millennium Mgmt | 92.9K | $542K |
Recent moves
20 transactions
- −2,479 · 2025Q4
- −119,041 · 2025Q4
- +958,690 · 2025Q4
- −201,079 · 2025Q4
- +383,121 · 2025Q4
- +4,267,524 · 2025Q4
- +123,410 · 2025Q4
- +7,146 · 2025Q4
- TRIMD.E. Shaw & Co.−1,901,783 · 2025Q4
- +104,700 · 2025Q4
- +20,069 · 2025Q3
- +854,384 · 2025Q3
- −168,239 · 2025Q3
- +469,385 · 2025Q3
- +4,967 · 2025Q3
- −4,021,242 · 2025Q3
- +388,900 · 2025Q3
- +24,457 · 2025Q2
- +5,197,967 · 2025Q2
- +1,011,325 · 2025Q2
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