- Quarter end
- 31 Dec 2025
- the date the book describes
- Filed
- 19 Feb 2026
- latest of these filings; the earliest 10 Feb 2026
- Managers listing it
- 24
- at least, of 95 tracked, among listed positions
- Comparable managers
- 92
- filed both Q3 2025 and Q4 2025; 1 listed it in both
- Shares listed
- 2,956,895
- combined, among listed positions
- Reported value
- $115m
- combined, at the quarter end
Among the 92 comparable managers: 18 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +186,138.
Managers listing CSTL in Q4 2025
24 of 24 holders
Largest increases and reductions, by shares
Increases
- Wellington Management Group LLPnew position · 218,560 shares now+218,560
- Jane Street Group LLCexisting position · 168,646 shares now+145,762
- Citadel Advisors LLCexisting position · 366,356 shares now+115,441
- Tudor Investment Corpexisting position · 167,178 shares now+81,743
- Invesco Ltdexisting position · 135,461 shares now+79,621
Reductions
- Millennium Management LLCexisting position · 308,914 shares now-266,175
- Point72 Asset Management LPexisting position · 119,458 shares now-217,500
- Renaissance Technologies LLCexisting position · 493,100 shares now-69,500
- Schonfeld Strategic Advisors LLCexisting position · 21,476 shares now-66,215
- Acadian Asset Management LLCexisting position · 390,406 shares now-61,246
New positions and exits
New (6)
Exited (2)
- Susquehanna International Group LLPwas $552k
- Brevan Howard Capital Management LPwas $436k
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q3 2019 | 1 | $3.0m | n.a. | n.a. |
| Q4 2019 | 1 | $7.1m | n.a. | n.a. |
| Q1 2020 | 1 | $6.6m | n.a. | n.a. |
| Q2 2020 | 1 | $18m | n.a. | n.a. |
| Q3 2020 | 2 | $27m | n.a. | n.a. |
| Q4 2020 | 1 | $139m | n.a. | n.a. |
| Q1 2021 | 2 | $179m | n.a. | n.a. |
| Q2 2021 | 3 | $187m | n.a. | n.a. |
| Q3 2021 | 3 | $138m | n.a. | n.a. |
| Q4 2021 | 3 | $73m | n.a. | n.a. |
| Q1 2022 | 3 | $80m | n.a. | n.a. |
| Q2 2022 | 2 | $5k | n.a. | n.a. |
| Q3 2022 | 1 | $6k | n.a. | n.a. |
| Q4 2022 | 1 | $5k | n.a. | n.a. |
| Q1 2023 | 1 | $5k | n.a. | n.a. |
| Q1 2024 | 1 | $4.7m | 1 | 0 |
| Q2 2024 | 1 | $6.1m | 1 | 0 |
| Q3 2024 | 3 | $12m | 3 | 0 |
| Q4 2024 | 1 | $11m | 1 | 1 |
| Q1 2025 | 1 | $14m | 1 | 0 |
| Q2 2025 | 1 | $11m | 0 | 1 |
| Q3 2025 | 1 | $10m | 0 | 1 |
| Q4 2025 | 2 | $16m | 18 | 8 |
| Q1 2026 | 1 | $12m | 16 | 8 |
| Q2 2026 | 1 | $22m | 11 | 11 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
CSTL and UNH →CSTL and ELV →CSTL and CI →Choose a stock to compare with CSTL →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own CSTL, latest filings →Back to the 13F Explorer →