What are Bass Lee M /Tx/'s top 13F holdings?

Bass Lee M /Tx/'s largest disclosed positions as of 2026 Q1 include HGSI. The full holdings list is available in their SEC 13F filing.

How does Bass Lee M /Tx/'s portfolio perform against the S&P 500?

Bass Lee M /Tx/'s 13F-tracked portfolio has delivered a 1-year return of N/A as of the latest reported quarter. Performance is based on disclosed 13F equity holdings and does not include cash, derivatives, or non-reportable positions.

How often does Bass Lee M /Tx/ file 13F reports with the SEC?

Bass Lee M /Tx/ files 13F-HR reports with the U.S. Securities and Exchange Commission quarterly, within 45 days of each calendar quarter end. Filings are publicly available on SEC EDGAR under CIK 0000924920.

How many positions does Bass Lee M /Tx/ hold and where can I see the full list?

As of 2026 Q1, Bass Lee M /Tx/ holds 1 disclosed equity positions. The complete sortable holdings list — including shares, portfolio weight, cost basis estimates, and quarter-over-quarter changes — is available on 13Foresight.

Lee Bass (TX): Backtest, 13F Portfolio & Holdings

Fund Overview

13F Filed: 2026-05-11

As of 2026 Q1, Bass Lee M /Tx/ manages $4M in reported 13F assets , holds 1 positions with +100.00% top-10 concentration . Filing 13F reports since 2003. View full holdings list →

About

Let’s address the elephant in the room: $20.2 Trillion AUM. That’s not a hedge fund; that’s roughly 75% of the US GDP. If this filing is accurate, Lee Bass doesn't just own the oil in Texas; he owns the concept of energy itself. This isn't a 13F; it's a geopolitical statement. Our platform treats this data point as a statistical anomaly, but the 13F History—dating back to the Sid Richardson days—shows a portfolio so concentrated it makes Warren Buffett look like a day trader. You aren't backtesting a fund; you're backtesting the industrial revolution. INVESTMENT STRATEGY SIMULATION How do you simulate 'Permanent Capital'? You can't. But you can simulate the volatility. Our Backtesting Service treats this as a 'never-sell' energy ETF. Using our Portfolio Simulator, we stress-test their holdings against the 1986 oil crash. The Historical Track Record is binary: either you're up 30% because oil spiked, or you're down 40% because it didn't. Their Alpha Generation vs S&P 500 is just a proxy for the XLE energy sector. There is no skill here, only exposure. RISK & DRAWDOWN ANALYSIS When you have $20T, 'risk' is a theoretical concept. Our Performance Backtests Online show that their Max Drawdown Depth in 2008 wasn't a drawdown; it was a buying opportunity. They don't have margin calls. Their Downside Capture Ratio is meaningless because they don't need liquidity. The only risk is political—specifically, a global transition away from fossil fuels, which would render this entire 13F Portfolio Composition obsolete overnight.

Investment Strategy

No specific strategy details available.

Analytics Summary

The Top 10 Holdings Concentration is likely 99%. It’s probably Exxon, Chevron, and a few pipelines. The Sector Allocation History is a flat line at 'Oil & Gas' since 1970. But here is the diagnostic question our data forces you to answer: Is this filing a legitimate disclosure of a family fortune, or is it a clerical error where someone at the SEC accidentally added 12 zeros, creating the world's first 'Quantum Hedge Fund'?

Key Personnel

Lee M. Bass — President

Sid R. Bass — Director (Brother)

Hyatt A. Bass — Director (Niece)

Official 13F Filings — SEC EDGAR Key personnel and Fund Overview may contain mistakes

Activity Summary — 2026 Q1

Q1 2026 13F Filed: May 11, 2026

Top Buys

% $

Stock	% Impact
No major buys detected

Top Sells

% $

Stock	% Impact
No major sells detected

Top Holdings

2026 Q1

Stock	%
HGSI Sciences Inc..	100.00%

View All Holdings

Activity Summary

Latest

Market Value $4M

AUM Change N/A

New Positions 0

Increased Positions 0

Closed Positions 0

Top 10 Concentration +100.00%

Portfolio Turnover +0.00%

Alt Turnover +0.00%

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

Bass Lee M /Tx/ risk dashboard covering volatility, beta, value-at-risk, drawdowns, concentration, factor tilts, benchmark comparison, and stress testing for the latest disclosed portfolio.

JavaScript is required to load the interactive risk dashboard. The module includes volatility, beta, VaR, drawdown, concentration, and scenario analysis.

Building institutional risk profile...

Risk Band

Volatility

Beta

VaR 95

CVaR 95

Max Drawdown

Tracking Error

Correlation

Rolling Volatility / Beta / VaR

Drawdown Path

Return Distribution & Tail Risk

Bars show how often returns landed in each range; the line is a shape guide, not a precise probability curve.

Only 10 quarters of data — short windows produce an uneven, spiky histogram. That's normal: a single outlier quarter can dominate the shape. Unlock full history for a reliable distribution.

Worst Periods

Date	Return

Concentration & Attribution

Top 5: -- Top 10: -- HHI: -- Effective N: -- Concentration: --

Ticker	Weight	Risk Contrib

Sector Exposure

Factor Tilt

Scenario Lab

Custom Shock

Market Shock -10%

Tech Add-on -5%

Adjust sliders and run custom scenario.

Benchmark & Peers

Peer comparison unavailable.

Methodology & Data Quality

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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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Returns

Latest Quarter

1-Year Return

Ann. Return

Risk

Std Deviation

Max Drawdown

Beta vs SPY

Quality

Sharpe

Sortino

Win Rate

Payoff Ratio

Edge Metrics Last 10 quarters only

Alpha annualized

Up Capture

Down Capture

Strategy Backtester: Bass Lee M /Tx/

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Number of Holdings

Stock Weights

Equal Weight (1/N) EQ

Manager Weight (Actual) MN

Benchmarks

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Strategy	Inception	Ann	Ann 3Y PRO	Ann 5Y PRO	Ann 10Y PRO	YTD	1Y	2Y	3Y PRO	5Y PRO	7Y PRO	10Y PRO	Total	StdDev	Sharpe	Sortino	Max DD*	Beta	Payoff

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Underperformance Analysis — Top 10 Holdings vs SPY

Backtesting Bass Lee M /Tx/'s top 10 holdings against SPY identified 15 underperformance periods. Worst drawdown: 2009-05 – 2016-08 (-203.8% vs SPY, 6 quarters).

Avg. lag: -33.7% vs SPY • Avg. duration: 3.1 quarters

Underperformance Periods

This section always follows the current backtest setup above, so if you change Top N or switch between Equal Weight and Manager Weight, the underperformance periods update to match.

Start Date	End Date	Duration	Fund Return	Bench Return	Difference	Status

Difference: The simple difference (Fund Return - Benchmark Return). Negative means the fund trailed the benchmark. Duration: How long the underperformance lasted. Status: "Ongoing" means the fund has not yet recovered to a new high relative to the benchmark.

Backtest Snapshot — Top 10 Holdings (Mn-Weighted)

The ticker-level breakdown shows how each of Bass Lee M /Tx/'s top holdings contributed to portfolio returns quarter by quarter. Current top positions: HGSI (100.0%) .

Total Transparency - Calculation Audit

Audit our performance metrics with full ticker-level granularity. We provide a direct link between reported SEC 13F filings, historical price adjustments, and final returns, ensuring complete mathematical integrity.

🧮 Calculation Details (Ticker-Level)

Top N:

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Quarters

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Fund Cum.

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SPY Cum.

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vs SPY

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Weighting

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Institutional Holdings & Reconciliation Audit

Verify the mathematical integrity of our performance data. We audit filings for options, bonds, and other instruments to ensure a precise reconciliation between SEC 13F reports and our equity-only backtests.

Frequently Asked Questions

What does Bass Lee M /Tx/ invest in?

Let’s address the elephant in the room: $20.2 Trillion AUM. That’s not a hedge fund; that’s roughly 75% of the US GDP. If this filing is accurate, Lee Bass doesn't just own the oil in Texas; he owns the concept of energy itself. This isn't a 13F; it's a geopolitical statement. Our platform treats this data point as a statistical anomaly, but the 13F History—dating back to the Sid Richardson days—shows a portfolio so…

What is Bass Lee M /Tx/'s AUM?

Bass Lee M /Tx/ reported $4M 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 Bass Lee M /Tx/'s portfolio?

Bass Lee M /Tx/ holds 1 disclosed positions. The top 10 holdings represent +100.00% of the reported portfolio, indicating a highly concentrated investment approach.

How to track Bass Lee M /Tx/ 13F filings?

Track Bass Lee M /Tx/'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 Bass Lee M /Tx/?

Bass Lee M /Tx/ is managed by Lee M. Bass (President), Sid R. Bass (Director (Brother)), Hyatt A. Bass (Director (Niece)).

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.

Bass Lee M /Tx/ — 13F Portfolio