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Fund Overview
13F Filed: 2026-05-15As of 2026 Q1, Ion Fund Management Ltd manages $707M in reported 13F assets , holds 62 positions with +67.45% top-10 concentration . Filing 13F reports since 2025. View full holdings list →
About
Investment Strategy
Official 13F Filings — SEC EDGAR
Key personnel and Fund Overview may contain mistakes
Activity Summary — 2026 Q1
Q1 2026 13F Filed:
May 15, 2026
Top Buys
%
$
| Stock | % Impact |
|---|---|
| +3.08% | |
| +2.40% | |
| +2.22% | |
| +2.05% | |
| +1.98% | |
| +1.76% |
Top Sells
%
$
| Stock | % Impact |
|---|---|
| -5.29% | |
| -4.67% | |
| -4.61% | |
| -4.39% | |
| -3.47% | |
| -3.33% |
Top Holdings
2026 Q1
Top 6 mgr. wt. · 2025 Q4+1.58%
| Stock | % |
|---|---|
| 16.45% | |
| 8.74% | |
| 7.97% | |
| 6.81% | |
| 6.07% | |
| 4.94% |
Activity Summary
Market Value
$707M
AUM Change
-17.58%
New Positions
14
Increased Positions
12
Closed Positions
16
Top 10 Concentration
+67.45%
Portfolio Turnover
+27.40%
Alt Turnover
+38.29%
Sector Allocation Trends
Free View: Last 10 Quarters. Subscribe to see full
history
Holdings Analysis
Size: % of Portfolio
Color: Last Full-Quarter Return
No data
Free: 10 quarters
Positions Dynamics
Visualizing Top 20 holdings weight history over the last 10 quarters.
Portfolio Analytics — Latest
ION Fund Management Ltd risk dashboard covering volatility, beta, value-at-risk, drawdowns, concentration, factor tilts, benchmark comparison, and stress testing for the latest disclosed portfolio.
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Real-time Analytics
High-Conviction Alpha
AAPL
92.4
NVDA
88.1
MSFT
74.3
Strategy Guardian
Style Drift
0.12
Sector Rotation
0.38
Tracking institutional benchmark deviation
Scenario Lab
2008 GFC
-32.4%
Covid-19
-18.1%
2022 Bear
-24.7%
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holding ·
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Live Scenario Lab stress tests
Best Strategy vs. Benchmarks
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Returns
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Latest Quarter
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1-Year Return
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Ann. Return
Risk
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Std Deviation
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Max Drawdown
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Beta vs SPY
Quality
--
Sharpe
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Sortino
--
Win Rate
--
Payoff Ratio
Edge Metrics
Last 10 quarters only
--
Alpha annualized
--
Up Capture
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Down Capture
Strategy Backtester: ION Fund Management Ltd
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Underperformance Analysis — Top 10 Holdings vs SPY
Backtesting ION Fund Management Ltd's top 10 holdings against SPY identified 1 underperformance period. Worst drawdown: 2026-03 – 2026-04 (-7.3% vs SPY, 2 quarters). Currently underperforming.
Avg. lag: -7.3% vs SPY
•
Avg. duration: 2.0 quarters
Backtest Snapshot — Top 10 Holdings (Mn-Weighted)
The ticker-level breakdown shows how each of ION Fund Management Ltd's top holdings contributed to portfolio returns quarter by quarter. Strongest recent contributors inside the last 5 years of the quarterly Top 10 backtest window: DK (2025 Q4 – 2025 Q4, +3.3 pts), ILMN (2025 Q4 – 2025 Q4, +2.3 pts), DAC (2025 Q4 – 2025 Q4, +1.9 pts), TEAM (2025 Q4 – 2025 Q4, +0.5 pts), PHIN (2025 Q4 – 2025 Q4, +0.1 pts) .
Strategy ann.: 21.1%
•
SPY ann.: 27.0%
•
Period:
2026–2026
Best Recent Contributors — Last 5Y
All 5 recent top contributors beat SPY,
which means this fund's strongest recent return drivers also outperformed the index over the same window.
■ Stock return (green = beat SPY)
■ Stock return (red = lagged SPY)
■ SPY same period
■ Cumulative contribution during the last 5 years of the quarterly Mn-weighted Top 10 strategy
Frequently Asked Questions
What does Ion Fund Management Ltd invest in?
Ion Fund Management Ltd is a hedge fund that files quarterly 13F reports with the SEC disclosing its publicly traded equity holdings.
What is Ion Fund Management Ltd's AUM?
Ion Fund Management Ltd reported $707M in 13F assets as of 2026 Q1. Note: 13F AUM reflects only long equity positions reported to the SEC and may differ from total assets under management.
How concentrated is Ion Fund Management Ltd's portfolio?
Ion Fund Management Ltd holds 62 disclosed positions. The top 10 holdings represent +67.45% of the reported portfolio, indicating a highly concentrated investment approach.
How to track Ion Fund Management Ltd 13F filings?
Track Ion Fund Management Ltd's quarterly filings on SEC EDGAR or on this page — data is updated within days of each filing deadline. Subscribe to 13Foresight for position-change alerts.
Disclaimer: 13Foresight is not a registered investment adviser, broker-dealer, or financial planner. All information on this site is provided solely for informational and educational purposes and does not constitute investment advice, a solicitation, or a recommendation to buy or sell any security. Portfolio backtests shown on this page are hypothetical and simulated — they do not represent actual trading results and were constructed with the benefit of hindsight. Actual results would differ materially. 13F filings disclose only long equity positions valued above $10,000, submitted up to 45 days after quarter-end; they do not capture short positions, options, bonds, cash, private investments, or non-U.S. securities. A fund's backtest performance may not reflect its actual returns, as managers frequently generate alpha through strategies not visible in 13F data. Past performance is not indicative of future results. All data sourced from public SEC EDGAR filings. Use at your own risk. Full Terms of Use.