Is SPRO or SPRY more undervalued in 2026?

CirclFi compares Spero Therapeutics, Inc. (SPRO) and ARS Pharmaceuticals, Inc. (SPRY) using 13 institutional-grade valuation models. SPRO has a Quality of Company score of 7.5/10 while SPRY scores 4.7/10.

Which is a better buy — SPRO or SPRY?

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 SPRY valuations compare?

SPRO at $2.90 and SPRY at $9.40 are compared across Bayesian DCF, EPV, EROIC Spread, First Chicago, Markov DDM, and 8 additional models.

SPRO vs SPRY 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

SPRY

Biotechnology

ARS Pharmaceuticals, Inc.

Quality

4.7

out of 10

Value Trap

SAFE

Price

$9.40

Last close

Models

8/13

Active

Model-by-Model Comparison

Model	Type	SPRO Fair Value	SPRO Upside	SPRY Fair Value	SPRY Upside
Bayesian DCF	Intrinsic	$1.28	-55.9%	$2.27	-75.8%
First Chicago	Scenario	$•••.••	••.•%	$•••.••	••.•%
ML-RIV	Intrinsic	$0.03	-98.6%	$1.53	-83.7%
Dynamic NAV	Asset-Based	$1.96	-32.3%	—	—
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 SPRY — Which Stock Is More Undervalued?

SPRO scores higher with a 7.5/10 quality rating vs SPRY's 4.7/10. Both stocks are analyzed daily using SEC EDGAR filings across 13 independent models.

Comparing Spero Therapeutics, Inc. (SPRO) and ARS Pharmaceuticals, Inc. (SPRY) 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 SPRY trades at $9.40 with a QOC of 4.7/10.

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).