DEFA14A ·Filed Apr 27, 2026

SPRO

Spero Therapeutics, Inc.
NEUTRAL
Impact 3/10
Horizonweeks Processed5mo ago SEC0001193125-26-182256
Proxy solicitation materials
Actionable Insight • Neutral

Monitor post-meeting filings for any share issuance or equity award grants under the new plan. The share authorization increase could precede a future capital raise.

DirectionNeutral
Confidencehigh
Horizonweeks
Final — all horizons settled through T+60d
SPRO ▼ -56.55% at T+60d
NEUTRAL call ✗ call lost -56.55% · α vs SPY -60.54% · entry $2.67 → $1.16
Entry anchored
Apr 27, 03:59 PM ET
via exchange tick
T+1d
-4.87%
call -4.87% · α -4.86%
$2.54
settled 5mo ago
T+5d
-6.37%
call -6.37% · α -8.06%
$2.50
settled 5mo ago
T+20d
+7.12%
call +7.12% · α +1.65%
$2.86
settled 4mo ago
T+60d
-56.55%
call -56.55% · α -60.54%
$1.16
settled 2mo ago

Price Chart

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Executive Summary

Spero Therapeutics filed additional proxy materials for its 2026 Annual Meeting, scheduled for June 23, 2026. Proposals include electing two Class III directors, ratifying the auditor, advisory vote on executive compensation, doubling authorized shares from 120M to 240M, and adopting a new stock incentive plan. The board recommends a 'For' vote on all items.

Key Facts

  • Annual meeting set for June 23, 2026
  • Proposal to increase authorized common shares from 120,000,000 to 240,000,000
  • Proposal to adopt the 2026 Spero Therapeutics, Inc. Stock Incentive Plan
  • All five proposals are recommended 'For' by the board
  • Market cap ~$159M with mixed analyst consensus

Financial Impact

Potential dilution from doubling authorized shares, but no immediate issuance announced.

dilution

Risk Factors

  • Future dilution from authorized share increase
  • Potential overhang if new equity issuance is announced

Market Snapshot

Exchange
Nasdaq
Sector
Pharmaceutical Preparations
Analyst Consensus
0% bullish (6 analysts)

Investment Themes

Biotech & Drug Discovery

Documents Analyzed

This report is based on 4 SEC documents filed with EDGAR.

DocumentAccession Number
DEFA14A Filing (Primary)0001193125-26-182256
Document: 0001193125-26-182256-index-headers.html0001193125-26-182256
Document: 0001193125-26-182256-index.html0001193125-26-182256
Document: 0001193125-26-182256.txt0001193125-26-182256
13 reports for SPRO
Performance horizon
63% Hit rate 5 of 8 directional calls best @ T+20▲ +14.59%Mar 26, 2026
Filters
Rows
Reports for SPRO — sortable, filterable
TypeNow
Sep 11, 2026
21d ago
EFFECT
BEARISH ★ 7/10
$1.13 $1.13· 0.00%▼ −0.34%$1.20 (−6.19%)
Aug 28, 2026
4w ago
8-K
BEARISH ★ 7/10
$1.22 $1.19▲ +2.46%▲ +2.32%$1.20 (+1.64%)
Aug 28, 2026
4w ago
S-3
BEARISH ★ 7/10
$1.22 $1.19▲ +2.46%▲ +2.32%$1.20 (+1.64%)
Aug 12, 2026
7w ago
Press Release
NEUTRAL ★ 4/10
$1.24 $1.22▼ −1.61%▲ +0.35%$1.20 (−3.23%)
Jul 14, 2026
11w ago
8-K
BULLISH ★ 8/10
$1.70 $1.44▼ −15.29%▼ −14.00%$1.20 (−29.41%)
Jul 14, 2026
11w ago
Press Release
BULLISH ★ 7/10
$1.70 $1.44▼ −15.29%▼ −14.00%$1.20 (−29.41%)
Jun 25, 2026
14w ago
8-K
NEUTRAL ★ 3/10
$2.26 $2.20▼ −2.65%▼ −4.82%$1.20 (−46.90%)
Jun 22, 2026
14w ago
8-K
BULLISH ★ 8/10
$2.15 $2.26▲ +5.12%▲ +4.10%$1.20 (−44.19%)
Jun 17, 2026
15w ago
Press Release
BULLISH ★ 8/10
$2.11 $2.10▼ −0.47%▲ +0.57%$1.20 (−43.13%)
May 13, 2026
20w ago
8-K
MIXED ★ 5/10
$2.76 $2.69▼ −2.54%▼ −1.82%$1.20 (−56.52%)
Showing 10 of 13

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