Insights

Why De-SPACs Underperform: The Evidence

Alphanume Team · March 22, 2026

The cohort returns behind the de-SPAC short.

The empirical pattern of de-SPAC underperformance is one of the more thoroughly documented anomalies in the post-2015 equity market. Multiple academic studies, practitioner analyses, and journalistic investigations have produced largely consistent findings: the cohort of companies that went public via SPAC merger over the last decade has, on average, substantially underperformed both broader market indices and traditional-IPO cohorts over comparable windows.

The headline numbers

From published studies of the 2019-2023 de-SPAC cohort:

Mean total return over the first 12 months post-merger: roughly -30% to -50%, depending on subsegment and time period.
Median total return often worse than mean (right-skewed distribution with occasional successful outliers).
Cohort underperformance vs Russell 2000 over 12 months: typically 30-50 percentage points.
Underperformance persists in 24- and 36-month windows for the majority of survivors.

The pattern is most pronounced in mergers that closed during the 2020-2021 SPAC boom — high valuations, weak target-company fundamentals, and overlapping cohort effects amplified the underlying structural issues.

The structural sources

Six structural factors explain most of the underperformance:

1. Sponsor promote dilution. Sponsors typically receive ~20% of post-IPO shares for nominal consideration. This is a substantial economic dilution that the target company carries into the merged entity.

2. High redemption rates. Public shareholders redeeming for trust cash reduce the merger's capital base, often leaving the combined entity materially under-capitalized vs the deal's original projections.

3. PIPE structure. PIPE investors price at $10 (the trust price) regardless of the post-merger market price. When the stock trades above $10 post-close, PIPE investors have immediate gains and incentive to monetize.

4. Lock-up cohort. Sponsor, target-insider, and PIPE lock-ups expire on dated schedules. Each expiration is a structural supply event.

5. Public warrant overhang. SPAC IPOs typically include public warrants at $11.50 strike. As the stock approaches strike, warrant exercises produce additional dilution.

6. Target-company quality selection. SPACs as a structure were used disproportionately by companies that either couldn't or chose not to access traditional IPO markets. Selection effects on target quality are real.

What conditioning improves the signal

The underperformance is not uniform across the cohort. Conditioning variables that improve the short-side signal:

Redemption rate. High-redemption mergers (50%+) underperform more than low-redemption mergers.
Initial post-merger float. Smaller float predicts more variability but also more downside as PIPE supply hits.
Target fundamentals. Pre-merger revenue and profitability characteristics correlate with post-merger outcomes.
Sector. EV-adjacent and high-growth tech segments had the highest concentration of distressed mergers.
Vintage. 2020-2021 vintage was structurally worse than 2018-2019 or 2023+.

What the studies disagree on

The aggregate underperformance pattern is well-established. Disagreements emerge in:

The magnitude attributable specifically to sponsor promote vs other structural factors.
Whether de-SPAC underperformance is converging toward traditional-IPO underperformance as the structure matures.
The extent to which the 2020-2021 vintage is representative of de-SPAC outcomes generally.
Whether selection bias (target-company quality) or structural-mechanic bias (promote/PIPE/redemption) dominates the explanation.

For trading purposes, the disagreements are less important than the robust headline finding: the cohort has underperformed substantially, and the underperformance has structural sources that persist beyond any single vintage.

What this enables systematically

The robust empirical finding supports systematic short-side positioning in:

Recently completed de-SPAC mergers with high redemption rates.
Post-merger names approaching major lock-up expirations.
Post-merger names with substantial public-warrant overhang at near-the-money strikes.
De-SPAC cohort members with deteriorating fundamentals post-merger.

Each subsegment can be screened from the structured merger and dilution data — see de-SPAC systematic short framework.