Stock Analysis
Data Source: SEC EDGAR 13F
Updated Hourly

Castle Biosciences Inc (CSTL)

174 + Investors. Track Smart Money conviction in CSTL. See who's accumulating, reducing, or initiating positions.

Current Price
-- USD
Analyst Target
-- (0 analysts)
Upside
0.00%
Net Flow Q/Q
↓ -10
Streak
2Q ▼
Buyers last Q
54%

Smart Money Signals — CSTL

Based on 176 hedge funds · latest filing: 2026 Q2 · updated quarterly

📉

Selling streak — 2 quarters in a row

last 6Q
For 2 consecutive quarters, more hedge funds reduced or closed their CSTL positions than added to them. Sustained institutional selling is a meaningful warning sign — these are professionals with deep research teams collectively deciding to exit.
📊

High ownership — 90% of 3.0Y peak

90% of all-time peak
176 funds currently hold this stock — 90% of the 3.0-year high of 196 funds (reached 2024 Q4). Ownership is elevated but not yet at maximum concentration. Room to grow, but watch if the trend reverses.
📶

Steady growth — +15% more funds vs a year ago

fund count last 6Q
+23 new funds entered over the past year (+15% YoY). Gradual, steady growth in institutional ownership is generally a healthy signal — not a speculative rush, but consistent conviction.
🟡

Slight buying edge — 54% buying

105 buying91 selling
Last quarter: 105 funds bought or added vs 91 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.
➡️

Steady new buyers — ~26 new funds per quarter

new funds entering per quarter
Funds opening this position for the first time: 34 → 43 → 27 → 26. A stable flow of new institutional buyers suggests ongoing interest without signs of either acceleration or slowdown.
🔒

57% of holders stayed for 2+ years

■ 57% conviction (2yr+) ■ 25% medium ■ 18% new
101 out of 176 hedge funds have held CSTL for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.
📊

Peak discovery — momentum slowing

17 → 34 → 43 → 27 → 26 new funds/Q
New funds entering each quarter: 34 → 43 → 27 → 26. CSTL is well-known in the hedge fund world, but fresh entries are gradually declining. The explosive phase of institutional discovery is likely behind us.
🏛️

Veteran-anchored — 60% veterans vs 20% newcomers

■ 60% veterans ■ 19% 1-2yr ■ 20% new
Entry-cohort mix of 176 holders: 106 (60%) are 2+ year veterans, 34 entered 1–2 years ago, and 36 (20%) joined within the past year. A veteran-weighted cap table skews toward institutional memory over fresh momentum.
🏆

Elite ownership — 45% AUM from top-100 funds

45% from top-100 AUM funds
45 of 176 holders are among the 100 largest funds by AUM, controlling 45% of total institutional value in CSTL. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.
3.0
out of 10
Low Exit Risk
Exit risk score 3.0/10 — low institutional crowding. Ownership is below peak levels, holder base is relatively sticky, and buying momentum is positive.

Methodology note: these Smart Money cards use consecutive 13F disclosure snapshots, not trade-by-trade execution data. "Buying", "selling", "new holders", and "trimmed" refer to quarter-over-quarter changes in reported holders, aggregate shares, or disclosed position values between filings. They are useful for ownership regime analysis and crowding, but they do not imply exact trade timing on the filing date.

Institutional Sentiment Summary — CSTL

In 2026 Q2, 105 hedge funds were net buyers of CSTL (26 opened a new position, 79 added to an existing one), while 91 reduced or exited (55 trimmed, 36 sold completely) — a 54% buyer ratio, indicating a slight buying edge. Net selling has persisted for two consecutive quarters. 45% of total institutional value in CSTL is held by top-100 AUM funds, reflecting elite-tier ownership quality. Net fund flow last quarter: -10 funds (more exits than new entries). Total institutional holders: 176.

Hedge Fund Ownership: CSTL

How many hedge funds hold CSTL — quarterly history vs. share price
Quarterly hedge fund ownership of CSTL vs. share price

Market Analysis: CSTL

Analyst Price Targets

Avg. Price Target
--

Analyst Recommendations

Stock Performance

Real-time

Company Profile: CSTL

-- --

Institutional ownership data sourced from SEC EDGAR Form 13F-HR filings.

Loading signal freshness…
Smart Money Signal ?
Limited Smart Money Interest

No strong consensus or elite conviction detected among institutional holders.

10 top-rated funds 0 high-conviction
Consensus
4.5
/ 10
breadth
×
Elite
0.3
/ 10
conviction
Hedge Fund Positioning: CSTL
174 + Investors

Track Smart Money conviction in CSTL. See who's accumulating, reducing, or initiating positions.

Metric All 13F Filers (2026 Q2) Prior (2026 Q1) Change
Funds Holding 174 186 -6.45%
13F Shares 27M 28M -1.35%
Total Value $626M $658M -4.78%
New Positions 26 27 -1
Increased Positions 77 73 +4
Closed Positions 38 36 +2
Reduced Positions 56 59 -3
Total Calls 0 3 -100.0%
Total Puts 0 1 -100.0%
PUT/CALL Ratio 0.0 0.33 Bullish

Statistics: CSTL

View More

Valuation Measures Data as of: --

Market Cap --
Enterprise Value --
Trailing P/E --
Forward P/E --
PEG Ratio (5yr expected) --
Price/Sales (ttm) --
Price/Book (mrq) --
Enterprise Value/Revenue --
Enterprise Value/EBITDA --
Beta (5Y Monthly) --
Short Ratio (Days to Cover) --
Short % of Float --

Financial Highlights

Profitability
Profit Margin --
Return on Assets (ttm) --
Return on Equity (ttm) --
Income Statement & Cash Flow
Revenue (ttm) --
Net Income Avi to Common (ttm) --
Diluted EPS (ttm) --
Total Cash (mrq) --
Total Debt/Equity (mrq) --
Levered Free Cash Flow (ttm) --

Institutional Holders (2026 Q2)

174 + investors

Explore institutional interest and hedge fund ownership dynamics. Analyze portfolio weights, new positions, and conviction trends in CSTL. Verified SEC 13F-HR filings.

QUARTER:
Top 25 CSTL holders by conviction (% of portfolio weight) — 2026 Q2 · Source: SEC Form 13F
# Investor % of Portfolio Shares Mkt Value
1 AIGH Capital Management LLC 0.82% 545,101 $13.0M
2 Rtw Investments, LP 0.57% 2,778,335 $66.3M
3 Parkman Healthcare Partners LLC 0.35% 144,791 $3.5M
4 Summit Partners Public Asset Management, LLC 0.35% 824,872 $19.7M
5 Portolan Capital Management, LLC 0.29% 328,818 $7.8M
6 Perkins Capital Management Inc 0.29% 16,140 $385K
7 Palisade Capital Management, LP 0.24% 231,931 $5.5M
8 Green Alpha Advisors, LLC 0.16% 9,941 $237K
9 Kennedy Capital Management LLC 0.15% 348,371 $8.3M
10 Birchview Capital, LP 0.14% 12,984 $310K
11 Kornitzer Capital Management Inc /Ks 0.13% 264,235 $6.3M
12 Jefferies Financial Group Inc. 0.10% 647,391 $15.4M
13 Bridgeway Capital Management, LLC 0.09% 221,338 $5.3M
14 First Bank & Trust 0.07% 18,591 $443K
15 Advisors Capital Management, LLC 0.06% 238,204 $5.7M
16 SummitTX Capital, L.P. 0.05% 79,018 $1.9M
17 Wasatch Advisors LP 0.04% 279,349 $6.7M
18 Silvercrest Asset Management Group LLC 0.04% 256,095 $6.1M
19 Counterpoint Mutual Funds LLC 0.04% 16,510 $394K
20 Oak Harvest Investment Services 0.03% 13,485 $322K
21 Trexquant Investment LP 0.03% 206,111 $4.9M
22 Inspire Investing, LLC 0.03% 29,047 $693K
23 Panagora Asset Management Inc 0.02% 301,040 $7.2M
24 TritonPoint Partners, LLC 0.02% 10,796 $257K
25 Campbell & CO Investment Adviser LLC 0.02% 16,476 $393K
Investor Ownership
History 		% of Portfolio Prev % Rank Conviction Avg Buy Price 13F Score™ 3Y / 7Y Sell Timing Shares Mkt Value Change Change % Source Quarter Filed

Frequently Asked Questions — Castle Biosciences Inc (CSTL)

What does the Smart Money Trend signal show for CSTL?

Selling streak — 2 quarters in a row: For 2 consecutive quarters, more hedge funds reduced or closed their CSTL positions than added to them. Sustained institutional selling is a meaningful warning sign — these are professionals with deep research teams collectively deciding to exit.

What is the institutional breadth score for CSTL?

Slight buying edge — 54% buying: Last quarter: 105 funds bought or added vs 91 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.

What is the fund quality score for CSTL holders?

Elite ownership — 45% AUM from top-100 funds: 45 of 176 holders are among the 100 largest funds by AUM, controlling 45% of total institutional value in CSTL. When the biggest players dominate the cap table, it signifies deep institutional support — since mega-funds deploy the most rigorous due diligence and capital.

How long have hedge funds held CSTL?

57% of holders stayed for 2+ years: 101 out of 176 hedge funds have held CSTL for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.

Where does this institutional ownership data come from?

All holdings data is sourced from SEC Form 13F filings, which institutional investment managers with over $100 million in assets are required to submit quarterly. Data is parsed directly from SEC EDGAR.

Disclaimer: The information on this page is for informational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any security. Institutional holdings data is sourced from SEC Form 13F filings and reflects positions as of the filing date. Past performance of any fund or portfolio is not indicative of future results. 13Foresight is not a registered investment adviser. Always conduct your own due diligence before making investment decisions.

Full history →