CSTL — CASTLE BIOSCIENCES INC

Ownership history in CITADEL ADVISORS LLC  ·  55 quarters on record

AI Ownership Summary

CITADEL ADVISORS LLC reported CASTLE BIOSCIENCES INC (CSTL) in 55 quarterly 13F filings from 2023 Q3 through 2025 Q4. The latest visible filing shows CSTL at 0.00% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.

What this CSTL ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was CITADEL ADVISORS LLC's position in CASTLE BIOSCIENCES INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

CSTL was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.0% in 2024 Q4

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q3 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

CSTL stock page CITADEL ADVISORS LLC fund profile CITADEL ADVISORS LLC full holdings
How CITADEL ADVISORS LLC held CSTL — position size vs. price
% of Fund (quarterly)    CSTL price (quarter-end, indexed to 100)
📋 Quarterly Holdings History 26 quarters  ▾
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 ADDED 366,356 +325,756 +802.4% 0.00% $14.3M 2026-02-14 (Est.) $33.15
2025 Q4 REDUCED 40,600 -210,315 -83.8% 0.00% $1.6M 2026-02-14 (Est.) $33.15
2025 Q3 ADDED 250,915 +226,615 +932.6% 0.00% $5.7M 2025-11-14 $33.45
2025 Q3 ADDED 24,300 +15,000 +161.3% 0.00% $553K 2025-11-14 $33.45
2025 Q3 REDUCED 9,300 -879,215 -99.0% 0.00% $212K 2025-11-14 $33.45
2025 Q2 ADDED 888,515 +883,515 +17670.3% 0.00% $18.1M 2025-08-14 $19.82
2025 Q1 REDUCED 5,000 -4,500 -47.4% 0.00% $100K 2025-05-15 $16.48
2025 Q1 REDUCED 9,500 -248,882 -96.3% 0.00% $190K 2025-05-15 $16.48
2025 Q1 REDUCED 258,382 -576,130 -69.0% 0.00% $5.2M 2025-05-15 $16.48
2024 Q4 ADDED 834,512 +793,312 +1925.5% 0.00% $22.2M 2025-02-14 $27.32
2024 Q4 ADDED 41,200 +32,900 +396.4% 0.00% $1.1M 2025-02-14 $27.32
2024 Q4 REDUCED 8,300 -624,716 -98.7% 0.00% $221K 2025-02-14 $27.32
2024 Q3 ADDED 633,016 +627,116 +10629.1% 0.00% $18.1M 2024-11-14 $30.83
2024 Q3 REDUCED 5,900 -50,100 -89.5% 0.00% $168K 2024-11-14 $30.83
2024 Q3 ADDED 56,000 +43,600 +351.6% 0.00% $1.6M 2024-11-14 $30.83
2024 Q2 ADDED 12,400 +12,300 +12300.0% 0.00% $270K 2024-08-14 $26.97
2024 Q2 REDUCED 100 -693,285 -100.0% 0.00% $2K 2024-08-14 $26.97
2024 Q2 ADDED 693,385 +37,619 +5.7% 0.00% $15.1M 2024-08-14 $26.97
2024 Q1 ADDED 655,766 +619,466 +1706.5% 0.00% $14.5M 2024-05-15 $24.36
2024 Q1 REDUCED 36,300 -292,449 -89.0% 0.00% $804K 2024-05-15 $24.36
2023 Q4 ADDED 328,749 +322,149 +4881.0% 0.00% $7.1M 2024-02-14 $23.50
2023 Q4 ADDED 6,600 +3,100 +88.6% 0.00% $142K 2024-02-14 $23.50
2023 Q4 REDUCED 3,500 -3,200 -47.8% 0.00% $76K 2024-02-14 $23.50
2023 Q3 REDUCED 6,700 -43,000 -86.5% 0.00% $113K 2023-11-14 $19.14
2023 Q3 REDUCED 49,700 -468,358 -90.4% 0.00% $839K 2023-11-14 $19.14
2023 Q3 ADDED 518,058 +510,158 +6457.7% 0.00% $8.7M 2023-11-14 $19.14
29 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding CSTL

As of 2025 Q4 — sorted by position size

AIGH Capital Management LLC 3Y 5.88% Portolan Capital Management, LLC 3Y 7Y 3.6% Birchview Capital, LP 3Y 7Y 1.84% PERKINS CAPITAL MANAGEMENT INC 3Y 7Y 0.87% SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 3Y 7Y 0.86% RTW INVESTMENTS, LP 3Y 7Y 0.82% PALISADE CAPITAL MANAGEMENT, LP 3Y 7Y 0.65% Parkman Healthcare Partners LLC 3Y 0.56% Green Alpha Advisors, LLC 3Y 0.36% Informed Momentum Co LLC 3Y 7Y 0.32%

FAQ About CITADEL ADVISORS LLC and CSTL

These are the practical questions this page is built to answer before you even open the full history table.

How long has CITADEL ADVISORS LLC reported owning CSTL?

CITADEL ADVISORS LLC reported CSTL across 26 quarterly 13F filings, from 2023 Q3 through 2025 Q4.

What was the largest reported CSTL position in CITADEL ADVISORS LLC's portfolio?

The largest reported portfolio weight for CSTL was 0.00% in 2024 Q4.

What is the latest reported CSTL position on this page?

The most recent filing on this page is 2025 Q4, when CITADEL ADVISORS LLC reported 366,356 shares, equal to 0.00% of portfolio, with an estimated market value of $14.3M.

What does the chart on this CSTL ownership page compare?

The chart compares CITADEL ADVISORS LLC's quarterly CSTL portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

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