Ticker · CUSIP 15687V109
Holders (tracked)
9
Combined shares
6,616,972
Combined value
$57.37M
Last close
$6.16
Quarter
2025Q4
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
Price is -29.0% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
19 events
- T. Rowe Price added2026-02-17+15,722 shares · 2025Q413F
- Ken Griffin (Citadel Advisors) added2026-02-17+2,035,801 shares · 2025Q413F
- D.E. Shaw & Co. added2026-02-17+78,669 shares · 2025Q413F
- AQR Capital Management trimmed2026-02-17−56,026 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−220,394 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−262,625 shares · 2025Q413F
- −19,122 shares · 2025Q413F
- Renaissance Technologies trimmed2026-02-12−93,020 shares · 2025Q413F
- Mario Gabelli (GAMCO) opened position2026-02-05+10,200 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) added2025-11-14+1,903,026 shares · 2025Q313F
- Two Sigma Investments added2025-11-14+61,734 shares · 2025Q313F
- D.E. Shaw & Co. added2025-11-14+22,450 shares · 2025Q313F
- T. Rowe Price added2025-11-14+7,205 shares · 2025Q313F
- AQR Capital Management added2025-11-14+30,678 shares · 2025Q313F
- +19,122 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−174,180 shares · 2025Q313F
- Norges Bank (Norway SWF) exited2025-11-13−36,303 shares · 2025Q313F
- Norges Bank (Norway SWF) trimmed2025-11-12−24,049 shares · 2024Q313F
- Mario Gabelli (GAMCO) exited2025-11-12−12,000 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of CERT…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Ken Griffin (Citadel Advisors) | 2020Q4 | $8.84 | -30.3% | $19.7M |
| Ken Griffin (Citadel Advisors) | 2020Q4 | $8.84 | -30.3% | $19.7M |
| Izzy Englander (Millennium Mgmt) | 2020Q4 | $8.99 | -31.5% | $16.3M |
| Renaissance Technologies | 2021Q2 | $9.51 | -35.2% | $182K |
| D.E. Shaw & Co. | 2021Q1 | $10.85 | -43.2% | $902K |
| Two Sigma Investments | 2021Q3 | $11.77 | -47.6% | $1.4M |
| AQR Capital Management | 2021Q4 | $11.91 | -48.3% | $1.5M |
| Mario Gabelli (GAMCO) | 2023Q3 | $14.45 | -57.4% | $63K |
| T. Rowe Price | 2020Q4 | $16.39 | -62.4% | $647K |
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions1
- Mario Gabelli (GAMCO)+10,200$90K
Added to3
- Ken Griffin (Citadel Advisors)+2,035,801$17.9M
- D.E. Shaw & Co.+78,669$693K
- T. Rowe Price+15,722$139
Trimmed4
- Izzy Englander (Millennium Mgmt)−262,625$2.3M
- Two Sigma Investments−220,394$1.9M
- Renaissance Technologies−93,020$820K
- AQR Capital Management−56,026$493K
Exited1
- Ray Dalio (Bridgewater Associates)−19,122$234K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 11 | $17.58B |
| 2022Q2 | 10 | $16.29B |
| 2022Q3 | 13 | $13.4M |
| 2022Q4 | 12 | $281.2M |
| 2023Q1 | 13 | $632.8M |
| 2023Q2 | 11 | $487.0M |
| 2023Q3 | 13 | $379.5M |
| 2023Q4 | 13 | $443.6M |
| 2024Q1 | 12 | $438.7M |
| 2024Q2 | 12 | $314.4M |
| 2024Q3 | 11 | $30.0M |
| 2024Q4 | 12 | $40.9M |
| 2025Q1 | 10 | $17.8M |
| 2025Q2 | 11 | $32.0M |
| 2025Q3 | 10 | $63.4M |
| 2025Q4 | 9 | $57.4M |
Who owns CERT
9 super-investors · 2025Q4
Tracked stake
6.62M
shares
Combined value
$57M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added4Trim4
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 3.19M | $28M |
| 2 | Izzy Englander Millennium Mgmt | 2.65M | $23M |
| 3 | AQR Capital Management | 236.6K | $2M |
| 4 | Two Sigma Investments | 220.6K | $2M |
| 5 | D.E. Shaw & Co. | 146.4K | $1M |
| 6 | Renaissance Technologies | 29.6K | $261K |
| 7 | Ken Griffin Citadel Advisors | 24.8K | $218K |
| 8 | Mario Gabelli GAMCO | 10.2K | $90K |
| 9 | T. Rowe Price | 105.1K | $926 |
Recent moves
20 transactions
- +78,669 · 2025Q4
- +2,035,801 · 2025Q4
- +15,722 · 2025Q4
- −220,394 · 2025Q4
- −56,026 · 2025Q4
- −262,625 · 2025Q4
- −19,122 · 2025Q4
- −93,020 · 2025Q4
- +10,200 · 2025Q4
- +30,678 · 2025Q3
- +7,205 · 2025Q3
- +22,450 · 2025Q3
- +1,903,026 · 2025Q3
- +61,734 · 2025Q3
- −36,303 · 2025Q3
- −174,180 · 2025Q3
- +19,122 · 2025Q3
- −12,000 · 2025Q3
- −24,049 · 2024Q3
- +309,813 · 2025Q2
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