Ticker · CUSIP 374163103
Holders (tracked)
9
Combined shares
19,406,109
Combined value
$25.62M
Last close
$1.68
Quarter
2025Q4
Price · 1Y$1.68+0.41 (+32.28%)H $1.95 · L $1.07 · Avg Vol 11.4M
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is +27.3% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
15 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−5,779,282 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−6,764,113 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+949,450 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+23,189 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−373,510 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−1,627,114 shares · 2025Q4Position
- Ken Fisher (Fisher Asset Mgmt) exited2026-02-09−27,209 shares · 2025Q4Position
- Steve Cohen (Point72) exited2025-11-14−9,606,217 shares · 2025Q3Position
- Two Sigma Investments opened position2025-11-14+1,852,018 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+5,320,635 shares · 2025Q3Position
- Wellington Management exited2025-11-14−249,489 shares · 2025Q3Position
- T. Rowe Price trimmed2025-11-14−209,607 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+209,904 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−2,634,820 shares · 2025Q3Position
- +27,209 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of GERN…
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 |
|---|---|---|---|---|
| Ken Griffin (Citadel Advisors) | 2016Q1 | $1.32 | +27.1% | $511K |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $1.32 | +27.1% | $511K |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $1.32 | +27.1% | $511K |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $1.44 | +16.7% | $242K |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $1.44 | +16.7% | $242K |
| Two Sigma Investments | 2018Q4 | $1.57 | +6.8% | $4.7M |
| AQR Capital Management | 2016Q1 | $1.71 | -1.5% | $75K |
| Renaissance Technologies | 2016Q1 | $2.07 | -19.0% | $1.2M |
| T. Rowe Price | 2016Q1 | $3.53 | -52.4% | $524K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions0
—
Added to2
- Two Sigma Investments+949,450$1.3M
- T. Rowe Price+23,189$31
Trimmed4
- Izzy Englander (Millennium Mgmt)−6,764,113$8.9M
- Ken Griffin (Citadel Advisors)−5,779,282$7.6M
- Renaissance Technologies−1,627,114$2.1M
- AQR Capital Management−373,510$493K
Exited1
- Ken Fisher (Fisher Asset Mgmt)−27,209$37K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 9 | $38.5M |
| 2022Q2 | 10 | $47.7M |
| 2022Q3 | 11 | $77.5M |
| 2022Q4 | 13 | $84.7M |
| 2023Q1 | 12 | $131.1M |
| 2023Q2 | 10 | $204.7M |
| 2023Q3 | 7 | $114.9M |
| 2023Q4 | 8 | $123.1M |
| 2024Q1 | 7 | $208.6M |
| 2024Q2 | 13 | $359.0M |
| 2024Q3 | 8 | $132.7M |
| 2024Q4 | 9 | $68.0M |
| 2025Q1 | 10 | $54.8M |
| 2025Q2 | 10 | $48.6M |
| 2025Q3 | 9 | $44.7M |
| 2025Q4 | 9 | $25.6M |
Who owns GERN
9 super-investors · 2025Q4
Tracked stake
19.41M
shares
Combined value
$26M
% of shares outstanding
—
shares-out unknown
Quarter action mix
Added2Trim7
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 9.93M | $13M |
| 2 | Izzy Englander Millennium Mgmt | 4.60M | $6M |
| 3 | Two Sigma Investments | 2.80M | $4M |
| 4 | Renaissance Technologies | 737.2K | $973K |
| 5 | Ken Griffin Citadel Advisors | 532.8K | $703K |
| 6 | T. Rowe Price | 312.0K | $412K |
| 7 | Ken Griffin Citadel Advisors | 304.4K | $402K |
| 8 | Izzy Englander Millennium Mgmt | 144.2K | $190K |
| 9 | AQR Capital Management | 44.4K | $59K |
Recent moves
20 transactions
- −373,510 · 2025Q4
- −5,779,282 · 2025Q4
- +949,450 · 2025Q4
- +23,189 · 2025Q4
- −6,764,113 · 2025Q4
- −1,627,114 · 2025Q4
- −27,209 · 2025Q4
- +1,852,018 · 2025Q3
- +5,320,635 · 2025Q3
- −9,606,217 · 2025Q3
- −249,489 · 2025Q3
- +209,904 · 2025Q3
- TRIMT. Rowe Price−209,607 · 2025Q3
- −2,634,820 · 2025Q3
- +27,209 · 2025Q3
- +65,038 · 2025Q2
- +2,479,399 · 2025Q2
- −4,759,271 · 2025Q2
- −2,734,810 · 2025Q2
- +160,674 · 2025Q2
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