Sector Investing Glossary
Sector Investing Glossary
The following definitions cover the essential vocabulary of sector investing, from the foundational GICS classification system through sector-specific metrics, ETF mechanics, and cycle-analysis concepts. Terms appear in alphabetical order.
AFFO (Adjusted Funds from Operations)
A REIT cash flow metric that subtracts maintenance capital expenditures from FFO to approximate true distributable income.
AFFO is considered more conservative than FFO because it accounts for the recurring spending required to maintain properties in their current condition. A REIT that reports strong FFO but weak AFFO may be deferring maintenance costs. Analysts use AFFO yield to compare REITs to other income investments: a REIT trading at 15x AFFO yields roughly 6.7%.
Allowed ROE
The return on equity a regulated utility is permitted to earn on its rate base, as set by the relevant public utility commission.
Allowed ROE typically ranges from 9–11% in the mid-2020s, though it varies by state and regulatory environment. A utility that earns exactly its allowed ROE is said to have "earned its allowed return." Utilities that consistently earn below allowed returns may face equity value impairment; those that engineer returns above the allowed level may attract regulatory scrutiny.
Beat-and-Raise
A quarterly earnings outcome in which a company reports results above analyst consensus and raises full-year guidance.
Beat-and-raise is the most positively received outcome in quarterly earnings season. For high-multiple technology and healthcare companies, beats without guidance increases often disappoint markets even when the absolute results look good. The "raise" is frequently more important than the "beat."
Blockbuster Drug
A pharmaceutical product generating more than $1 billion in annual sales.
Blockbuster drugs define the economics of large pharmaceutical companies. A single blockbuster can fund years of R&D and generate returns many times its development cost. The loss of patent protection on a blockbuster drug — the "patent cliff" — can cost a company billions in annual revenue, replaced only slowly by a new product pipeline.
Book Value (Tangible)
A bank or financial firm's assets minus liabilities minus intangible assets, representing the hard asset backing per share.
Price-to-tangible book value (P/TBV) is the primary valuation metric for commercial banks. Banks historically traded between 1.0x and 2.5x tangible book. A bank trading below 1.0x TBV signals that the market expects the bank to destroy value through future losses. The 2023 regional bank crisis triggered P/TBV compressions across the sector.
Cap Rate
The net operating income of a real estate property divided by its purchase price, expressed as a percentage.
A property generating $1 million in NOI and purchased for $15 million has a cap rate of 6.7%. Cap rates function inversely to real estate valuations: lower cap rates indicate higher prices relative to income, analogous to the P/E ratio for stocks. When interest rates rise, required cap rates typically rise as well, causing property values to fall.
Crack Spread
The difference between the market price of refined petroleum products (gasoline, diesel, jet fuel) and the cost of crude oil input.
Refiners earn the crack spread on every barrel they process. When crude oil prices fall faster than refined product prices, crack spreads widen and refiner margins surge. The 3-2-1 crack spread — three barrels of crude oil producing two barrels of gasoline and one barrel of heating oil — is the most commonly cited benchmark.
Cyclical Sector
A sector whose revenues and earnings expand rapidly during economic growth and contract sharply during recessions.
Consumer Discretionary, Industrials, Materials, Energy, and Financials are generally classified as cyclical sectors. Their operating leverage amplifies the economic cycle in both directions. Valuing cyclical companies requires estimating earnings at a mid-cycle rather than peak or trough level to avoid buying at apparent cheapness near cycle peaks.
Defensive Sector
A sector whose revenues and earnings are relatively stable across the economic cycle.
Consumer Staples, Healthcare, and Utilities are the canonical defensive sectors. Their products face inelastic demand — consumers need toothpaste, medications, and electricity regardless of economic conditions. Defensive sectors tend to underperform in bull markets but preserve capital in downturns, making them valuable for risk management.
EV/EBITDA
Enterprise value divided by earnings before interest, taxes, depreciation, and amortization.
EV/EBITDA is a capital-structure-neutral valuation multiple used across most sectors. It is particularly useful for capital-intensive businesses (utilities, telecoms, industrials) where depreciation and capital structure vary significantly between competitors. A utility trading at 12x EBITDA and a tech company at 25x EBITDA are both plausibly valued given their different growth and risk profiles.
FFO (Funds from Operations)
A REIT earnings metric calculated as net income plus real estate depreciation and amortization, minus gains on property sales.
FFO is the standard REIT earnings measure because GAAP net income, which deducts large depreciation charges on real estate, understates the economic earnings of property companies whose assets typically appreciate rather than depreciate. FFO per share is used in the same way that EPS is used for industrial companies.
Float (Insurance)
The pool of premium payments received by an insurance company that has not yet been paid out as claims.
Insurance float is an interest-free loan from policyholders to the insurer. A well-run insurer invests this float conservatively and earns investment income while waiting to pay claims. Warren Buffett's Berkshire Hathaway famously built much of its wealth by deploying insurance float into equities and acquisitions.
GICS (Global Industry Classification Standard)
A four-level hierarchical system — sector, industry group, industry, sub-industry — that classifies every publicly traded company into one of 11 sectors.
GICS was developed jointly by MSCI and S&P Dow Jones Indices and launched in 1999. It is the dominant classification framework used by institutional investors globally. Every S&P 500 company belongs to exactly one GICS sub-industry, ensuring that sector indices are mutually exclusive and collectively exhaustive.
Hard Market (Insurance)
A period of rising insurance premiums, tightening coverage availability, and improving underwriting profitability.
Hard markets typically follow periods of significant losses — major hurricanes, catastrophic wildfires, or pandemic-related claims — that force insurers to reprice risk and reduce capacity. Hard markets benefit well-capitalized insurers that can selectively underwrite profitable business. They eventually attract new capital and competition, sowing the seeds of the subsequent soft market.
Henry Hub
The primary pricing benchmark for natural gas in North America, located at a pipeline interconnection in Erath, Louisiana.
Henry Hub spot and futures prices set the reference for most North American natural gas contracts. LNG exporters pricing their product at Henry Hub plus a liquefaction premium benefit when Henry Hub prices rise. Electricity generators, petrochemical producers, and home heating consumers are natural buyers exposed to Henry Hub price risk.
Medical Loss Ratio (MLR)
The percentage of health insurance premium revenue paid out in medical claims and quality improvement activities.
The ACA requires health insurers to maintain MLRs of at least 80% in individual/small group markets and 85% in large group markets; insurers below those thresholds must rebate premiums to policyholders. MLR is the single most important operating metric for managed care organizations — a rising MLR signals that claims are outpacing premium growth, compressing profit margins.
Net Interest Margin (NIM)
The difference between a bank's interest income on loans and its interest expense on deposits and borrowings, expressed as a percentage of earning assets.
NIM is the fundamental revenue metric for commercial banking. A bank with a 3% NIM on $100 billion in earning assets generates $3 billion in net interest income. NIMs widen when the yield curve steepens and narrow when it flattens or inverts. Rising short rates benefit banks by increasing loan rates faster than deposit rates if the bank has pricing power.
OPEC+
The Organization of the Petroleum Exporting Countries plus affiliated non-OPEC oil producers (most notably Russia) that coordinate production levels.
OPEC+ manages production quotas across 23 nations controlling a substantial share of global oil supply. Production cut decisions by the group directly affect global oil prices and therefore the revenue outlook for energy sector companies. Market participants monitor OPEC+ meeting outcomes closely as a primary input to oil price forecasting.
Operating Leverage
The degree to which a company's earnings increase proportionally more than revenues during periods of growth.
Companies with high fixed costs and low variable costs have high operating leverage. An industrial manufacturer with a large fixed cost base might see earnings rise 30% when revenues rise 10%. This amplification works symmetrically in downturns, making high-operating-leverage businesses particularly volatile through the cycle.
Patent Cliff
The multi-year period during which a pharmaceutical company loses exclusive patent protection on major branded drugs, exposing them to generic competition.
Generic entry typically causes branded drug prices to fall 70–90% within months of patent expiration, devastating revenue for the affected product. Companies facing patent cliffs must replenish their product pipeline through R&D or acquisitions to maintain revenue. Analysts track upcoming patent expirations as a primary risk factor for pharma company valuations.
PMI (Purchasing Managers' Index)
A monthly survey of purchasing managers assessing business conditions, with a reading above 50 indicating expansion and below 50 contraction.
The ISM Manufacturing PMI and ISM Services PMI are the most widely followed PMI surveys in the United States. PMI readings are leading indicators that often signal turns in industrial production, capital goods orders, and employment several months before broader economic data confirm the trend. Industrial sector investors monitor PMI closely as a sector-timing tool.
Rate Base
The total value of assets on which a regulated utility is entitled to earn a regulated return.
Rate base is the denominator in the regulatory earnings formula: Rate Base × Allowed ROE = Allowed Earnings. Utilities grow earnings by expanding the rate base through capital investment, requesting rate case approval, and earning the allowed return on the larger asset base. Regulators may disallow certain costs from the rate base if they deem the spending imprudent.
Relative Strength
A measure of a security or sector's performance relative to a benchmark over a specified period.
Sector relative strength charts plot a sector's cumulative return divided by the benchmark's return, showing whether the sector is outperforming (rising line) or underperforming (falling line). Relative strength analysis is used to identify emerging sector leadership changes before they become widely recognized. Momentum strategies that overweight high-relative-strength sectors have demonstrated persistent performance in academic research.
Rule of 40
A software company valuation heuristic requiring that the sum of revenue growth rate plus operating margin (or free cash flow margin) equals or exceeds 40%.
A software company growing revenue 30% with 15% operating margins scores 45 on the Rule of 40, considered healthy. A company growing 15% with only 5% margins scores 20, suggesting it is neither growing fast enough nor profitable enough to justify premium valuation. The Rule of 40 helps investors compare companies at different growth/profitability trade-off points.
Same-Store Sales (SSS)
Revenue growth from retail or restaurant locations open for at least one year, excluding the impact of new store openings or closures.
SSS, also called comparable-store sales or "comps," measures the organic health of existing locations. Positive SSS indicates that existing stores are attracting more customers, higher spending per visit, or both. Negative SSS signals fundamental demand weakness. SSS is the most closely watched operational metric for retailers and restaurant chains.
Sector Rotation
The reallocation of portfolio assets from one sector to another in anticipation of or in response to changes in the economic cycle, interest rates, or inflation.
Sector rotation is both an investment strategy and a naturally occurring market phenomenon. As the economy moves through expansion, peak, contraction, and trough, capital flows toward the sectors best positioned for the current phase. Practitioners use economic indicators, technical analysis, and fund flow data to time rotations, though the evidence for consistent timing ability is mixed.
Sub-Industry
The fourth and most granular level of the GICS classification hierarchy, beneath sector, industry group, and industry.
There are more than 160 sub-industries in the GICS framework. Examples include "Semiconductor Equipment," "Application Software," "Managed Health Care," "Electric Utilities," and "Diversified Banks." Sub-industry classification determines which sector index a company belongs to and therefore which sector ETFs own it.
Take-or-Pay Contract
A pipeline or infrastructure contract requiring the counterparty to either take delivery of a specified quantity of product or pay a contractual fee regardless of actual volumes.
Take-or-pay contracts provide midstream energy companies with revenue certainty regardless of producer activity levels. They are a key reason midstream pipeline companies trade at lower valuation multiples and narrower yield spreads than upstream E&P companies: the revenue stream is more predictable and less exposed to commodity price risk.
Volatility Decay
The compounding erosion of returns in leveraged or inverse ETFs that rebalance daily, caused by the mathematical properties of sequential percentage changes.
A leveraged ETF that delivers 2x daily returns will not deliver 2x returns over a multi-day period if the underlying index moves up and down. For example, if an index falls 10% then rises 11.1%, it has returned to its starting level. The 2x leveraged ETF would fall 20%, then rise 22.2%, leaving it at 97.8% of its starting value — a 2.2% loss despite the index breaking even. This decay accelerates in volatile markets and makes leveraged sector ETFs unsuitable as long-term holdings.
Yield Curve
The relationship between interest rates (yields) and maturity dates for bonds of similar credit quality, typically US Treasury securities.
A normal yield curve slopes upward, with longer maturities offering higher yields. An inverted yield curve — short-term rates above long-term rates — has historically preceded recessions and is closely watched as a leading economic indicator. The shape of the yield curve directly affects bank net interest margins, REIT borrowing costs, utility financing rates, and the relative attractiveness of high-yield sectors.