Ticker · CUSIP 374689107
Holders (tracked)
10
Combined shares
796,389
Combined value
$39.37M
Last close
$39.40
Quarter
2025Q4
Price · 1Y$39.40-12.38 (-23.91%)H $74.58 · L $37.63 · Avg Vol 303K
Position opened
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
Price is -20.3% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
21 events
- AQR Capital Management trimmed2026-02-17−57,143 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−91,428 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−5,645 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+1,922 shares · 2025Q4Position
- Wellington Management exited2026-02-17−416,963 shares · 2025Q4Position
- Two Sigma Investments opened position2026-02-17+7,005 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+37,738 shares · 2025Q4Position
- Steve Cohen (Point72) added2026-02-17+22,263 shares · 2025Q4Position
- Ray Dalio (Bridgewater Associates) added2026-02-13+2,635 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−65,500 shares · 2025Q4Position
- Mario Gabelli (GAMCO) trimmed2026-02-05−200 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−93,006 shares · 2025Q3Position
- Steve Cohen (Point72) trimmed2025-11-14−22,724 shares · 2025Q3Position
- D.E. Shaw & Co. trimmed2025-11-14−33,007 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+956 shares · 2025Q3Position
- Wellington Management trimmed2025-11-14−112,691 shares · 2025Q3Position
- AQR Capital Management trimmed2025-11-14−3,275 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−105,365 shares · 2025Q3Position
- +3,535 shares · 2025Q3Position
- Mario Gabelli (GAMCO) trimmed2025-11-12−1,100 shares · 2025Q3Position
- Norges Bank (Norway SWF) trimmed2025-11-12−31,347 shares · 2024Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ROCK…
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 | $47.73 | -17.4% | $3.6M |
| T. Rowe Price | 2016Q3 | $48.60 | -18.9% | $1.4M |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $50.55 | -22.1% | $3.7M |
| Renaissance Technologies | 2016Q1 | $51.95 | -24.2% | $1.5M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $52.54 | -25.0% | $1.9M |
| Ray Dalio (Bridgewater Associates) | 2025Q3 | $57.09 | -31.0% | $243K |
| D.E. Shaw & Co. | 2016Q1 | $58.08 | -32.2% | $12.6M |
| Steve Cohen (Point72) | 2019Q4 | $59.13 | -33.4% | $4.7M |
| AQR Capital Management | 2016Q1 | $61.49 | -35.9% | $1.5M |
| Two Sigma Investments | 2016Q1 | $70.18 | -43.9% | $276K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Two Sigma Investments+7,005$346K
Added to4
- Izzy Englander (Millennium Mgmt)+37,738$1.9M
- Steve Cohen (Point72)+22,263$1.1M
- Ray Dalio (Bridgewater Associates)+2,635$130K
- T. Rowe Price+1,922$95
Trimmed5
- Ken Griffin (Citadel Advisors)−91,428$4.5M
- Renaissance Technologies−65,500$3.2M
- AQR Capital Management−57,143$2.8M
- D.E. Shaw & Co.−5,645$279K
- Mario Gabelli (GAMCO)−200$10K
Exited1
- Wellington Management−416,963$26.2M
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 15 | $14.50B |
| 2022Q2 | 15 | $7.15B |
| 2022Q3 | 15 | $339.9M |
| 2022Q4 | 14 | $368.2M |
| 2023Q1 | 15 | $386.2M |
| 2023Q2 | 17 | $510.1M |
| 2023Q3 | 14 | $437.1M |
| 2023Q4 | 14 | $529.4M |
| 2024Q1 | 15 | $616.8M |
| 2024Q2 | 16 | $530.6M |
| 2024Q3 | 15 | $159.5M |
| 2024Q4 | 13 | $71.3M |
| 2025Q1 | 11 | $182.5M |
| 2025Q2 | 10 | $98.1M |
| 2025Q3 | 11 | $86.1M |
| 2025Q4 | 10 | $39.4M |
Who owns ROCK
10 super-investors · 2025Q4
Tracked stake
796.4K
shares
Combined value
$39M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added4Trim5
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | D.E. Shaw & Co. | 319.8K | $16M |
| 2 | Steve Cohen Point72 | 118.2K | $6M |
| 3 | Ken Griffin Citadel Advisors | 93.3K | $5M |
| 4 | Mario Gabelli GAMCO | 91.3K | $5M |
| 5 | Izzy Englander Millennium Mgmt | 49.4K | $2M |
| 6 | Renaissance Technologies | 39.1K | $2M |
| 7 | AQR Capital Management | 37.4K | $2M |
| 8 | T. Rowe Price | 34.6K | $2M |
| 9 | Two Sigma Investments | 7.0K | $346K |
| 10 | Ray Dalio Bridgewater Associates | 6.2K | $305K |
Recent moves
20 transactions
- −416,963 · 2025Q4
- −57,143 · 2025Q4
- +7,005 · 2025Q4
- +37,738 · 2025Q4
- TRIMD.E. Shaw & Co.−5,645 · 2025Q4
- +22,263 · 2025Q4
- −91,428 · 2025Q4
- +1,922 · 2025Q4
- +2,635 · 2025Q4
- −65,500 · 2025Q4
- −200 · 2025Q4
- −22,724 · 2025Q3
- −112,691 · 2025Q3
- +956 · 2025Q3
- −93,006 · 2025Q3
- −3,275 · 2025Q3
- TRIMD.E. Shaw & Co.−33,007 · 2025Q3
- +3,535 · 2025Q3
- −105,365 · 2025Q3
- −31,347 · 2024Q3
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