Ticker · CUSIP 14843C105
Holders (tracked)
11
Combined shares
2,055,960
Combined value
$79.98M
Last close
$25.05
Quarter
2025Q4
Price · 1Y$25.05+3.54 (+16.46%)H $43.04 · L $14.65 · Avg Vol 434K
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is -35.6% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
19 events
- Ken Griffin (Citadel Advisors) added2026-02-17+115,441 shares · 2025Q4Position
- D.E. Shaw & Co. added2026-02-17+67,095 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+58,366 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−266,175 shares · 2025Q4Position
- Steve Cohen (Point72) trimmed2026-02-17−217,500 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+1,545 shares · 2025Q4Position
- Wellington Management opened position2026-02-17+218,560 shares · 2025Q4Position
- +167,178 shares · 2025Q4Position
- AQR Capital Management added2026-02-17+13,039 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−69,500 shares · 2025Q4Position
- −76,454 shares · 2025Q3Position
- Steve Cohen (Point72) opened position2025-11-14+336,958 shares · 2025Q3Position
- Two Sigma Investments trimmed2025-11-14−2,541 shares · 2025Q3Position
- D.E. Shaw & Co. trimmed2025-11-14−55,576 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+146,692 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+6,186 shares · 2025Q3Position
- Wellington Management exited2025-11-14−407,211 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+1,612 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−107,900 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of CSTL…
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 |
|---|---|---|---|---|
| Wellington Management | 2025Q1 | $20.02 | +25.1% | $5.5M |
| Izzy Englander (Millennium Mgmt) | 2019Q3 | $23.70 | +5.7% | $7.7M |
| Renaissance Technologies | 2020Q1 | $24.38 | +2.7% | $12.4M |
| AQR Capital Management | 2020Q4 | $25.45 | -1.6% | $1.6M |
| Steve Cohen (Point72) | 2020Q1 | $27.16 | -7.8% | $3.0M |
| D.E. Shaw & Co. | 2020Q2 | $30.34 | -17.4% | $4.0M |
| Paul Tudor Jones (Tudor Investment) | 2021Q1 | $31.30 | -20.0% | $4.2M |
| Two Sigma Investments | 2020Q2 | $33.47 | -25.2% | $2.1M |
| T. Rowe Price | 2020Q4 | $35.31 | -29.0% | $855K |
| Ken Griffin (Citadel Advisors) | 2019Q3 | $37.10 | -32.5% | $9.2M |
| Ken Griffin (Citadel Advisors) | 2019Q3 | $37.10 | -32.5% | $9.2M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Wellington Management+218,560$8.5M
- Paul Tudor Jones (Tudor Investment)+167,178$6.5M
Added to5
- Ken Griffin (Citadel Advisors)+115,441$4.5M
- D.E. Shaw & Co.+67,095$2.6M
- Two Sigma Investments+58,366$2.3M
- AQR Capital Management+13,039$507K
- T. Rowe Price+1,545$60
Trimmed3
- Izzy Englander (Millennium Mgmt)−266,175$10.4M
- Steve Cohen (Point72)−217,500$8.5M
- Renaissance Technologies−69,500$2.7M
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 9 | $184.2M |
| 2022Q2 | 9 | $82.8M |
| 2022Q3 | 13 | $109.2M |
| 2022Q4 | 14 | $97.9M |
| 2023Q1 | 11 | $91.8M |
| 2023Q2 | 9 | $47.5M |
| 2023Q3 | 10 | $59.1M |
| 2023Q4 | 9 | $75.5M |
| 2024Q1 | 9 | $84.4M |
| 2024Q2 | 11 | $101.7M |
| 2024Q3 | 9 | $54.3M |
| 2024Q4 | 10 | $76.5M |
| 2025Q1 | 12 | $59.2M |
| 2025Q2 | 9 | $55.6M |
| 2025Q3 | 10 | $44.7M |
| 2025Q4 | 11 | $80.0M |
Who owns CSTL
11 super-investors · 2025Q4
Tracked stake
2.06M
shares
Combined value
$80M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added6Trim3
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Renaissance Technologies | 493.1K | $19M |
| 2 | Ken Griffin Citadel Advisors | 366.4K | $14M |
| 3 | Izzy Englander Millennium Mgmt | 308.9K | $12M |
| 4 | Wellington Management | 218.6K | $9M |
| 5 | Paul Tudor Jones Tudor Investment | 167.2K | $7M |
| 6 | D.E. Shaw & Co. | 159.7K | $6M |
| 7 | Steve Cohen Point72 | 119.5K | $5M |
| 8 | Two Sigma Investments | 84.1K | $3M |
| 9 | AQR Capital Management | 63.9K | $2M |
| 10 | Ken Griffin Citadel Advisors | 40.6K | $2M |
| 11 | T. Rowe Price | 34.1K | $1M |
Recent moves
20 transactions
- +13,039 · 2025Q4
- +167,178 · 2025Q4
- +58,366 · 2025Q4
- +67,095 · 2025Q4
- −217,500 · 2025Q4
- +115,441 · 2025Q4
- +1,545 · 2025Q4
- +218,560 · 2025Q4
- −266,175 · 2025Q4
- −69,500 · 2025Q4
- −76,454 · 2025Q3
- TRIMD.E. Shaw & Co.−55,576 · 2025Q3
- +1,612 · 2025Q3
- +336,958 · 2025Q3
- −407,211 · 2025Q3
- −2,541 · 2025Q3
- +6,186 · 2025Q3
- +146,692 · 2025Q3
- −107,900 · 2025Q3
- −236,218 · 2025Q2
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