Spero Therapeutics, Inc. Common Stock (SPRO)

Typically moves ±5.79% on earnings

EARNINGS ANALYTICS

event_upcoming Est. Next Earnings: 2026-08-07 ESTIMATED

Spero Therapeutics, Inc. Common Stock (SPRO) has reported earnings 20 times since Aug 05, 2021. The stock moves an average of ±5.79% the day after reporting, closing higher 30.0% of the time. Its largest post-earnings gain was +13.37% (May 13, 2026) and its largest decline was -18.67% (Mar 31, 2022). The next earnings report is predicted for 2026-08-07 (estimated).

Earnings reactions

How SPRO moved on each past earnings report.

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Earnings Impact

Total Earnings

Avg Abs. Movement

±5.79%

Positive %

30.0%

Negative %

70.0%

Historical Earnings Statistics

Date	Timing	Earnings move	SEC Filing
May 13, 2026	☽ POST	+13.37%	open_in_new
Mar 26, 2026	☽ POST	-1.69%	open_in_new
Nov 13, 2025	☽ POST	-2.04%	open_in_new
Aug 12, 2025	☽ POST	-18.05%	open_in_new
May 13, 2025	☽ POST	+1.82%	open_in_new
Mar 27, 2025	☽ POST	-13.96%	open_in_new
Nov 14, 2024	☽ POST	-5.24%	open_in_new
Aug 05, 2024	☽ POST	-3.73%	open_in_new
May 15, 2024	☽ POST	-2.76%	open_in_new
Mar 13, 2024	☽ POST	+4.82%	open_in_new
Nov 13, 2023	☽ POST	-2.7%	open_in_new
Aug 10, 2023	☽ POST	-3.1%	open_in_new
May 11, 2023	☽ POST	-2.88%	open_in_new
Mar 30, 2023	☽ POST	+1.74%	open_in_new
Nov 14, 2022	☽ POST	-5.53%	open_in_new
Aug 10, 2022	☽ POST	-8.18%	open_in_new
May 16, 2022	☽ POST	-3.24%	open_in_new
Mar 31, 2022	☽ POST	-18.67%	open_in_new
Nov 10, 2021	☽ POST	+0.75%	open_in_new
Aug 05, 2021	☽ POST	+1.58%	open_in_new

event

Earnings Count

Total earnings in dataset

trending_up

Avg Abs. Movement

±5.79%

Avg % price change on earnings

description

SEC Filings

View

Browse all SEC filings

account_balance

Institutional ownership

Holdings as of Mar 31, 2026 · SEC 13-F

View all 11 →

Funds holding

$30903699

Total value held

Buying

5 added · 1 reduced

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$21506018 NEW BUY

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$2082551 Held

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$1013693 -0.10%

State Street Corp

$502517 +2.19%

SEC Filing Types

Recent SEC Filings

10 most recent

Form	Date Filed	View on EDGAR
8-K	20260714	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
4	20260625	open_in_new SEC.gov
8-K	20260625	open_in_new SEC.gov
S-8	20260623	open_in_new SEC.gov

Frequently asked about SPRO earnings

When does Spero Therapeutics, Inc. Common Stock report earnings next? expand_more

Spero Therapeutics, Inc. Common Stock (SPRO)'s next earnings date is estimated for 2026-08-07. This is a prediction based on its historical quarterly reporting pattern, not a company-confirmed date.

How much does SPRO stock move after earnings? expand_more

Over 20 reports, SPRO has moved an average of ±5.79% the session after earnings, closing higher 30.0% of the time.

What was SPRO's biggest post-earnings move? expand_more

SPRO's largest post-earnings gain on record was +13.37% on May 13, 2026, and its largest decline was -18.67% on Mar 31, 2022.

Where can I find Spero Therapeutics, Inc. Common Stock's SEC filings? expand_more

All of Spero Therapeutics, Inc. Common Stock's SEC filings — 10-K, 10-Q, 8-K and more — are listed in the SEC filings section on this page, each linking to the original document on SEC.gov.