Is SPRO or SRZN more undervalued in 2026?

CirclFi compares Spero Therapeutics, Inc. (SPRO) and Surrozen, Inc. (SRZN) using 13 institutional-grade valuation models. SPRO has a Quality of Company score of 7.5/10 while SRZN scores 4.1/10.

Which is a better buy — SPRO or SRZN?

Compare intrinsic values from 13 independent models against current market prices. CirclFi also calculates Value Trap scores. This is not financial advice — conduct your own analysis.

How do SPRO and SRZN valuations compare?

SPRO at $2.90 and SRZN at $26.16 are compared across Bayesian DCF, EPV, EROIC Spread, First Chicago, Markov DDM, and 8 additional models.

SPRO vs SRZN Valuation Comparison 2026 — Intrinsic Value Analysis

SPRO

Biotechnology

Spero Therapeutics, Inc.

Quality

7.5

out of 10

Value Trap

WARN

Price

$2.90

Last close

Models

10/13

Active

SRZN

Biotechnology

Surrozen, Inc.

Quality

4.1

out of 10

Value Trap

LOW

Price

$26.16

Last close

Models

8/13

Active

Model-by-Model Comparison

Model	Type	SPRO Fair Value	SPRO Upside	SRZN Fair Value	SRZN Upside
Bayesian DCF	Intrinsic	$1.28	-55.9%	$11.85	-54.7%
First Chicago	Scenario	$•••.••	••.•%	$•••.••	••.•%
ML-RIV	Intrinsic	$•••.••	••.•%	$•••.••	••.•%
Dynamic NAV	Asset-Based	$1.96	-32.3%	$0.88	-97.3%
PWERM	Option-Based	$•••.••	••.•%	$•••.••	••.•%
Regime Cross-Sectional	Relative	$•••.••	••.•%	$•••.••	••.•%
Sentiment SOTP	Hybrid	$•••.••	••.•%	$•••.••	••.•%
CUCE Ensemble	Ensemble	$•••.••	••.•%	$•••.••	••.•%
FTNN Topology	Relative	$•••.••	••.•%	$•••.••	••.•%
RCMH-DCF	Intrinsic	$•••.••	••.•%	$•••.••	••.•%

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SPRO vs SRZN — Which Stock Is More Undervalued?

SPRO scores higher with a 7.5/10 quality rating vs SRZN's 4.1/10. Both stocks are analyzed daily using SEC EDGAR filings across 13 independent models.

Comparing Spero Therapeutics, Inc. (SPRO) and Surrozen, Inc. (SRZN) across 13 institutional-grade valuation models reveals how each company's intrinsic value stacks up against its market price. CirclFi's engine processes SEC EDGAR 10-K and 10-Q filings, FRED macroeconomic data, and GDELT news sentiment to generate independent fair value estimates daily.

SPRO currently trades at $2.90 with a QOC of 7.5/10, while SRZN trades at $26.16 with a QOC of 4.1/10.

Both companies are analyzed with models spanning intrinsic (Bayesian DCF, EPV), scenario-based (First Chicago), regime-switching (Markov DDM, RCMH-DCF), machine learning (ML-RIV, FTNN Topology), and ensemble methods (CUCE).