Spinoff investing: buying parent and spinoff after corporate spin-off events

When a parent company spins off a subsidiary into a separate publicly-traded entity, both the parent and the spinoff often outperform the broader market in the months following the event. The pattern is well-documented in the academic literature and has been the basis of a documented investment strategy since the 1990s. The structural and behavioural drivers behind the outperformance suggest the effect should persist, but execution and identification challenges limit the realised premium.

What spinoff investing is

Spinoff investing is a systematic strategy that buys the shares of recently-spun-off subsidiaries (and, in some implementations, the parent companies that did the spinning) immediately after the corporate event, holding them for a defined period (typically 12–24 months). The strategy was popularised for retail investors by Joel Greenblatt's You Can Be a Stock Market Genius (1997), which documented the historical outperformance pattern and provided a framework for analysing individual spinoffs.

The structural drivers of the outperformance are several. Spinoffs are typically smaller than their parents and are less covered by sell-side analysts, leaving the price less efficiently set in the period immediately after the spin. Forced selling by index funds and institutional holders that cannot hold the spinoff (because of size, sector, or mandate restrictions) creates a temporary price discount. Management focus improves after the spin—both the parent and the spinoff have leadership teams now exclusively focused on their respective businesses.

The behavioural drivers are equally meaningful. Investors often dismiss spinoffs as irrelevant complications when the parent company executes them, undervaluing the new entity at issuance. Greenblatt's framework explicitly targets the gap between the price the market initially sets and the value the underlying business eventually proves to have.

How it works

The standard spinoff strategy has three components. First, identify the spinoff calendar: companies announcing or completing spin-offs, typically tracked through SEC filings, exchange announcements, and dedicated spinoff databases. Second, evaluate each spinoff individually: business quality, leverage, management quality, and any specific factors (insider buying, low analyst coverage, forced selling) that suggest the spinoff is mispriced. Third, build the portfolio: typically equal-weighted positions in the eligible spinoffs, held for 12–24 months and then sold or rotated into the next batch.

The implementation has both systematic and discretionary versions. Systematic spinoff funds and ETFs hold a broad basket of recent spinoffs, typically all eligible spinoffs above a size threshold. Discretionary implementations apply judgement to each spinoff, often producing more concentrated portfolios with higher conviction in fewer names.

The Bloomberg Spin-Off Index and the Invesco Beta Spin-Off ETF are widely-cited benchmarks for the strategy. Both have produced returns above the broader equity market over multi-decade samples, though with substantial dispersion year-to-year.

What the evidence shows

Cusatis, Miles, and Woolridge (1993) provided the foundational empirical study, documenting that spinoffs outperformed their industry benchmark by approximately 11 percentage points per year over 1965–1988 across US-listed spinoffs. Parent companies also outperformed, by approximately 6 percentage points per year over the same window. Subsequent work by McConnell and Ovtchinnikov (2004) extended the analysis through 2000 and found similar but smaller effects.

The pattern has continued in more recent samples, though with more variability. Bloomberg's Spin-Off Index has outperformed the S&P 500 by approximately 3–5 percentage points per year over 2002–2022, depending on the exact window. The annualised dispersion is high—in some years the strategy outperforms by 20+ percentage points, in others it underperforms—but the multi-decade average has been positive.

Several specific dynamics have driven recent performance. Larger spinoffs (above USD 1 billion in market capitalisation) have outperformed smaller ones, contrary to the original Cusatis-Miles-Woolridge finding that smaller spinoffs were more strongly mispriced. Tax-free spinoffs (the standard structure under US §355) have outperformed taxable equivalents. The underlying premium appears to be real but its magnitude has narrowed as the pattern has become more widely known.

Limitations and trade-offs

Spinoff investing requires active monitoring of the corporate calendar. Identifying and analysing each spinoff is time-intensive, and the small size of many spinoffs means the strategy is most efficient when implemented across a broad basket rather than by selecting individual names. Retail investors operating without dedicated research can capture the strategy's premium most efficiently through the relevant ETFs or funds.

The strategy is also sensitive to the corporate-action environment. Spinoff activity is highly cyclical—concentrated in periods when boards seek to unlock value and quiescent during periods of M&A consolidation. A spinoff strategy may have very few candidates in some years and many in others, producing uneven portfolio characteristics over time.

Tax considerations matter. The forced sale of either the parent or the spinoff creates a taxable event in many jurisdictions, and the resulting tax bill can erode the strategy's after-tax return. The strategy is most efficient in tax-deferred accounts, where the structural premium can be captured without the friction of immediate taxation.

Finally, the strategy's edge depends on continued mispricing of spinoffs at issuance. As the pattern becomes more widely known and more capital is deployed against it, the realised premium can compress. The post-2000 narrowing relative to the original Cusatis-Miles-Woolridge findings is consistent with this expectation.

Spinoff investing in pfolio

Individual spinoff stocks are tracked in pfolio's stock universe once they begin trading. The platform's analytics apply to spinoffs from their listing date forward; spinoff-specific strategies require external curation of the spinoff calendar.

Related articles

• Spin-offs and split-offs: corporate actions that create new listed entities
• The value factor: why underpriced assets have historically outperformed
• Mergers and acquisitions explained: how M&A events affect your portfolio
• The size factor: the small-cap premium and why it is harder to capture than it looks