Seres Therapeutics effects 1-for-20 reverse stock split, effective April 21, 2025

Seres Therapeutics, Inc.

Reverse stock split at 1-for-20 ratio, effective 5:00 PM ET on April 21, 2025.
Common stock begins split-adjusted trading on Nasdaq on April 22, 2025 under symbol MCRB.
No fractional shares will be issued; holders receive cash in lieu of fractional shares.
Authorized shares and par value per share remain unchanged.
Stockholders approved split range of 1:5 to 1:50; Board fixed final ratio at 1:20.

item 5.03 item 9.01

Machine-readable event card

schema_version: secwatch.filing_event.v1
accession: 0001193125-25-089189
form_type: 8-K
ticker: MCRB
cik: 0001609809
company_name: Seres Therapeutics, Inc.
filed_at: 2025-04-22T23:59:59+00:00
discovered_at: 2026-05-14T18:02:49.009109+00:00
generated_at: 2026-05-23T09:19:10.906431+00:00
sec_items: ["5.03", "9.01"]
event_type: other_material
sentiment: neutral
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: high
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