Ticker · CUSIP 36246K103
Holders (tracked)
2
Combined shares
363,200
Combined value
$3.50M
Last close
$9.28
Quarter
2025Q4
Price · 1Y$9.28+0.53 (+6.09%)H $9.80 · L $8.51 · Avg Vol 32K
Position opened
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is -3.6% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
3 events
- +20,974 shares · 2025Q4Position
- Mario Gabelli (GAMCO) added2026-02-05+30,000 shares · 2025Q4Position
- Mario Gabelli (GAMCO) trimmed2025-11-12−30,000 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of GRX…
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 |
|---|---|---|---|---|
| Mario Gabelli (GAMCO) | 2016Q1 | $10.18 | -8.9% | $3.2M |
| Ken Griffin (Citadel Advisors) | 2021Q2 | $10.59 | -12.4% | $195K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Ken Griffin (Citadel Advisors)+20,974$202K
Added to1
- Mario Gabelli (GAMCO)+30,000$289K
Trimmed0
—
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 1 | $4.2M |
| 2022Q2 | 1 | $3.5M |
| 2022Q3 | 1 | $3.1M |
| 2022Q4 | 2 | $3.4M |
| 2023Q1 | 2 | $3.2M |
| 2023Q2 | 1 | $3.2M |
| 2023Q3 | 1 | $2.7M |
| 2023Q4 | 1 | $3.0M |
| 2024Q1 | 1 | $3.3M |
| 2024Q2 | 1 | $3.1M |
| 2024Q3 | 1 | $3.4M |
| 2024Q4 | 1 | $3.3M |
| 2025Q1 | 1 | $3.5M |
| 2025Q2 | 2 | $3.3M |
| 2025Q3 | 1 | $2.8M |
| 2025Q4 | 2 | $3.5M |
Who owns GRX
2 super-investors · 2025Q4
Tracked stake
363.2K
shares
Combined value
$3M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Mario Gabelli GAMCO | 342.2K | $3M |
| 2 | Ken Griffin Citadel Advisors | 21.0K | $202K |
Recent moves
20 transactions
- +20,974 · 2025Q4
- +30,000 · 2025Q4
- −30,000 · 2025Q3
- −7,883 · 2025Q2
- +7,883 · 2025Q1
- +33,000 · 2024Q4
- −11,980 · 2024Q3
- +1,285 · 2023Q4
- +15,695 · 2023Q2
- −23,428 · 2022Q4
- −78 · 2022Q3
- +428 · 2022Q2
- +690 · 2022Q1
- −11,268 · 2021Q3
- +7,117 · 2021Q4
- +11,268 · 2021Q2
- +6,760 · 2021Q2
- +14,976 · 2021Q1
- −24,786 · 2020Q4
- +7,947 · 2020Q4
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