Hedge Fund / Asset Manager

SPHERA FUNDS MANAGEMENT LTD. — 13F Portfolio

SEC Filing Investment Manager (Non-US Domiciled) Institutional CIK: 0001496201
13F Score ?
18
3Y · Top 10 · Mgr Wt
13F Score ?
34
7Y · Top 10 · Mgr Wt
S&P 500 ?
80
Benchmark
$630M
AUM
+0.00%
2026 Q1
+64.46%
1-Year Return
+36.68%
Top 10 Concentration
+17.58%
Turnover
+21.73%
AUM Change
Since 2013
First Filing
96
# of Holdings

Fund Overview

13F Filed: 2026-05-15

As of 2026 Q1, Sphera Funds Management Ltd. manages $630M in reported 13F assets , holds 96 positions with +36.68% top-10 concentration , and delivered a 1-year return of +64.46% on its disclosed equity portfolio. Filing 13F reports since 2013. View full holdings list →

About

Investment Strategy

Analytics Summary

Key Personnel

Rami Sagi — Founder & Chief Executive Officer
Uri Belenky — Chief Investment Officer
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
+3.18%
PUT Option
+2.70%
+1.96%
CALL Option
+1.79%
+1.78%
+1.58%

Top Sells

% $
Stock % Impact
Sold All 😨 Was: 2.40% -1.97%
CALL Option
Sold All 😨 Was: 2.28%
-1.87%
Sold All 😨 Was: 1.28% -1.05%
NICE NICE LTD..
-0.90%
-0.76%
Sold All 😨 Was: 0.90% -0.74%

Top Holdings

2026 Q1 Top 6 mgr. wt. · 2026 Q1+0.00%
Stock %
5.76%
5.44%
4.06%
PUT Option
4.06%
3.68%
2.89%
View All Holdings

Activity Summary

Latest
Market Value $630M
AUM Change +21.73%
New Positions 20
Increased Positions 32
Closed Positions 23
Top 10 Concentration +36.68%
Portfolio Turnover +17.58%
Alt Turnover +26.85%

Sector Allocation Trends

Quarterly History
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

SPHERA FUNDS MANAGEMENT LTD. risk dashboard covering volatility, beta, value-at-risk, drawdowns, concentration, factor tilts, benchmark comparison, and stress testing for the latest disclosed portfolio.

Risk access
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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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Real conviction scores for every holding  ·  Strategy Guardian alerts  ·  Live Scenario Lab stress tests
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Best Strategy vs. Benchmarks

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Returns
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Risk
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Std Deviation
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Max Drawdown
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Beta vs SPY
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Payoff Ratio
Edge Metrics Last 10 quarters only
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Alpha annualized
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Up Capture
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Down Capture

Strategy Backtester: SPHERA FUNDS MANAGEMENT LTD.

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Find the best N! Test multiple portfolio sizes at once to discover the optimal configuration.

Risk insights! Identify periods when the fund lagged the benchmark – critical for timing entries.

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Underperformance Analysis — Top 10 Holdings vs SPY

Backtesting SPHERA FUNDS MANAGEMENT LTD.'s top 10 holdings against SPY identified 33 underperformance periods. Worst drawdown: 2020-10 – 2021-05 (-31.8% vs SPY, 8 quarters). Currently underperforming.

Avg. lag: -7.9% vs SPY Avg. duration: 2.5 quarters
Backtest Snapshot — Top 10 Holdings (Mn-Weighted)

The ticker-level breakdown shows how each of SPHERA FUNDS 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: TSEM (2023 Q3 – 2025 Q4, +26.5 pts), TEVA (2023 Q1 – 2025 Q4, +24.4 pts), NVMI (2023 Q4 – 2025 Q4, +13.9 pts), XENE (2021 Q2 – 2021 Q2, +9.8 pts), AZN (2021 Q2 – 2025 Q4, +9.7 pts) .

Strategy ann.: 9.8% SPY ann.: 14.1% Period: 2014–2026
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.
2023 Q3 – 2025 Q4 • 5Q in Top 10 Beat SPY
TSEM
+681%
SPY
+37%
Contrib
+26.5%
2023 Q1 – 2025 Q4 • 9Q in Top 10 Beat SPY
TEVA
+239%
SPY
+52%
Contrib
+24.4%
2023 Q4 – 2025 Q4 • 6Q in Top 10 Beat SPY
NVMI
+168%
SPY
+31%
Contrib
+13.9%
2021 Q2 – 2021 Q2 • 1Q in Top 10 Beat SPY
XENE
+87%
SPY
+6%
Contrib
+9.8%
2021 Q2 – 2025 Q4 • 17Q in Top 10 Beat SPY
AZN
+135%
SPY
+62%
Contrib
+9.7%
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 Sphera Funds Management Ltd. invest in?
Sphera Funds Management employs a fundamentally driven, research-intensive investment approach with a pronounced emphasis on the healthcare and life sciences value chain. The firm's core competency lies in evaluating pharmaceutical pipelines, clinical trial data, FDA regulatory pathways, and the commercial potential of therapeutic assets across oncology, rare diseases, immunology, and medical devices. This specialized knowledge enables the team — led by CIO Uri Belenky — to identify asymmetric risk-reward opportunities that generalist managers may overlook or misjudge. The investment style blends elements of growth and growth-at-a-reasonable-price (GARP) investing with event-driven catalysts. Sphera frequently positions around binary clinical events, regulatory milestones, and M&A activity within the biotech and pharma space. The firm also maintains selective exposure to technology and broader sectors where the team identifies compelling fundamental setups, though healthcare remains the dominant allocation pillar. Portfolio construction reflects a willingness to hold concentrated positions in high-conviction names while maintaining diversification across therapeutic areas and market capitalizations. The **13F Portfolio Composition** reveals a mix of large-cap pharmaceutical holdings — providing portfolio stability and liquidity — alongside mid-cap and small-cap biotech names where the greatest upside potential and idiosyncratic alpha typically reside. Turnover tends to be moderate to high, consistent with an event-driven overlay that responds to clinical readouts, regulatory decisions, and shifting competitive dynamics within therapeutic categories. The **Sector Allocation History** observable across quarterly filings underscores Sphera's persistent healthcare overweight, though the precise sub-sector tilts — between pharmaceuticals, biotechnology, medical devices, and healthcare services — shift meaningfully over time in response to the team's assessment of where the most attractive opportunities lie. INVESTMENT RISK PROFILE The risk profile of Sphera Funds Management is shaped fundamentally by its sector concentration in healthcare and life sciences — an industry segment characterized by both idiosyncratic catalysts and systematic exposure to regulatory, political, and scientific risk. Biotech-heavy portfolios are inherently subject to elevated volatility, particularly around binary events such as Phase III clinical trial results, FDA advisory committee meetings, and drug pricing policy developments. The **Max Drawdown Depth** for a portfolio with Sphera's characteristics can be significant during periods of sector-wide dislocation. Notable stress episodes for healthcare-focused managers have included the 2015-2016 drug pricing controversy, the broader biotech correction of late 2021 into 2022, and intermittent periods of risk-off sentiment that disproportionately affect smaller-capitalization biotech equities. The firm's inclusion of large-cap pharma names likely provides a partial buffer during such episodes, though concentration risk remains an inherent feature of the strategy. From a **Volatility Profile** perspective, Sphera's disclosed portfolio would be expected to exhibit higher standard deviation than a broad-market benchmark, given the beta characteristics of biotech and pharmaceutical equities. However, the firm's hedging capabilities — consistent with its hedge fund structure — may mitigate realized portfolio volatility beyond what is visible in the long-only 13F disclosure. Allocators should recognize that 13F filings capture only the U.S. long equity book and do not reflect short positions, options overlays, non-U.S. holdings, or other risk management instruments that Sphera may employ. Liquidity risk is another relevant consideration. Smaller-capitalization biotech names can experience thin trading volumes, particularly in periods of market stress, which may amplify drawdowns and complicate position management. The mix of large-cap and small-cap holdings visible in filings suggests Sphera manages this risk through deliberate position sizing across the liquidity spectrum. The platform's backtesting service and portfolio simulator tools can help approximate the historical risk-adjusted outcomes of Sphera's disclosed long positions, though users should account for the inherent limitations of 13F-only analysis.
What is Sphera Funds Management Ltd.'s AUM?
Sphera Funds Management Ltd. reported $630M 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 Sphera Funds Management Ltd.'s portfolio?
Sphera Funds Management Ltd. holds 96 disclosed positions. The top 10 holdings represent +36.68% of the reported portfolio, indicating a diversified investment approach.
How to track Sphera Funds Management Ltd. 13F filings?
Track Sphera Funds 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.
Who manages Sphera Funds Management Ltd.?
Sphera Funds Management Ltd. is managed by Rami Sagi (Founder & Chief Executive Officer), Uri Belenky (Chief Investment Officer).

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.

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