Drawdown - Parallax API

Drawdown measures how much your portfolio fell from its highest point to its lowest point before recovering. It shows the worst loss you would have experienced and the psychological pain of staying invested.

Beginner

What It Means

Drawdown is the decline from a peak to a trough. Maximum drawdown is the largest such decline over your investment period - the worst-case scenario you’d have lived through.

Portfolio Example

Your portfolio hits an all-time high of $100,000. Over the next 6 months, it falls to $75,000 before starting to recover. Maximum Drawdown = 25% ($25,000 loss / $100,000 peak)

Recovery Reality

The math of recovery is brutal - you need bigger gains to recover from losses:

Drawdown	Gain Needed to Recover
10%	11%
20%	25%
30%	43%
50%	100%
75%	300%

Why It Matters

Drawdown tells you the psychological and financial pain you’ll need to endure during rough patches. Many investors abandon strategies at the bottom of drawdowns, locking in losses. Understanding potential drawdowns helps you stay the course.

Advanced

Mathematical Definition

Drawdown (DD) = (Trough Value - Peak Value) / Peak Value × 100%

Maximum Drawdown (MDD) = max{DDi} for all i

Recovery Time = Time from trough back to peak value

Calmar Ratio = Annual Return / |Maximum Drawdown|

Historical Context

While drawdown analysis has long been part of investment practice, Ed Seykota and other commodity trading advisors in the 1970s-80s popularized maximum drawdown as a key risk metric. The Calmar Ratio (developed by Terry W. Young in 1991) formalized using MDD for risk-adjusted performance.

What Makes It Useful

Practical Risk Measure: Directly represents largest loss an investor would have experienced
Psychological Relevance: Captures the emotional difficulty of staying invested
Capital Preservation: Shows capital at risk during worst periods
Recovery Analysis: Time-to-recovery provides insight into strategy resilience
Downside Focus: Unlike standard deviation, only measures harmful outcomes

Detailed Example

Portfolio values over time:
Month 0:  $100,000 (peak)
Month 1:  $95,000   (5% drawdown)
Month 2:  $88,000   (12% drawdown)
Month 3:  $75,000   (25% maximum drawdown - trough)
Month 4:  $82,000   (still in drawdown: 18% from peak)
Month 5:  $93,000   (still in drawdown: 7% from peak)
Month 6:  $103,000  (recovery complete, new peak)

Key Metrics:
- Maximum Drawdown: -25%
- Drawdown Duration: 3 months (peak to trough)
- Recovery Time: 3 months (trough to new peak)
- Total Drawdown Period: 6 months (peak to full recovery)

Data Requirements

Requirement	Duration	Notes
Minimum	5 years	Capture at least one significant correction
Preferred	10+ years	Include a full market cycle
Ideal	15-20 years	See 2-3 complete market cycles

Short periods (less than 5 years) likely miss the strategy’s true worst-case drawdown. You need to see how it performs through a real bear market.

Relationship to Volatility

The relationship between volatility and maximum drawdown is non-linear and strategy-dependent: Empirical Reality:

Equity strategies with 15% annual volatility have experienced maximum drawdowns of 40-60% over multi-decade periods
S&P 500: 2000-2002 MDD ≈ 50%, 2008-2009 MDD ≈ 55%

General Relationships:

Higher Sharpe Ratio → Lower maximum drawdown (generally)
Lower correlation → Lower portfolio drawdown vs. individual assets

Limitations

Endpoint Sensitivity: MDD depends heavily on start/end dates of measurement period
Ignores Frequency: Single severe drawdown vs. multiple moderate drawdowns treated differently
Backward-Looking: Historical MDD doesn’t predict future maximum loss
Path Dependency: Same average return and volatility can have very different drawdown profiles

Alternatives

Alternative	Description
CDaR	Conditional Drawdown at Risk - average of worst X% of drawdowns
Ulcer Index	Measures depth and duration of drawdowns, not just maximum
Pain Ratio	Return divided by Ulcer Index
Recovery Factor	Net profit divided by maximum drawdown

Path Dependency Insight

Two portfolios with identical statistics can have very different drawdown profiles:

Both portfolios: Mean 10%, Volatility 15%, Sharpe 0.53

Portfolio A: Gradual decline, quick recovery
- MDD: 22%, Duration: 8 months

Portfolio B: Sharp crash, slow grind recovery
- MDD: 45%, Duration: 36 months

Volatility alone cannot predict drawdown profile - path matters

Practical Guidelines:

Strategy type drives drawdown: Momentum has sharp crashes, value has grinding drawdowns
2× leverage → 2× MDD (linear), but recovery time increases non-linearly
Expect recovery time ≈ 1.5× drawdown duration as empirical rule

Standard Deviation

Related but different risk measure

Sharpe Ratio

Higher Sharpe = lower drawdowns

Correlation

Spikes during drawdowns

​Beginner

​What It Means

​Portfolio Example

​Recovery Reality

​Why It Matters

​Advanced

​Mathematical Definition

​Historical Context

​What Makes It Useful

​Detailed Example

​Data Requirements

​Relationship to Volatility

​Limitations

​Alternatives

​Path Dependency Insight

​Related Terms

Standard Deviation

Sharpe Ratio

Correlation

Beginner

What It Means

Portfolio Example

Recovery Reality

Why It Matters

Advanced

Mathematical Definition

Historical Context

What Makes It Useful

Detailed Example

Data Requirements

Relationship to Volatility

Limitations

Alternatives

Path Dependency Insight

Related Terms