---
schema_version: "secwatch.filing_event.v1"
accession: "0001534969-23-000127"
form_type: "8-K"
ticker: "SERA"
cik: "0001534969"
company_name: "SERA PROGNOSTICS, INC."
filed_at: "2023-12-12T23:59:59+00:00"
generated_at: "2026-06-07T14:10:22.568239+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "medium"
source: SEC EDGAR
---

# Sera Prognostics amends Baker Bros. director nomination threshold to 19.9%

## Summary
- Amendment No. 2 to Side Letter with Baker Bros. Advisors LP executed Dec 6, 2023.
- Baker Bros. must now beneficially own at least 19.9% of total voting power to nominate a director.
- Previous threshold was lower; change raises bar for board appointment rights.
- Amendment will be filed as exhibit to 2023 Form 10-K.

## SEC filing metadata
- accession: 0001534969-23-000127
- form_type: 8-K
- ticker: SERA
- cik: 0001534969
- company_name: SERA PROGNOSTICS, INC.
- filed_at: 2023-12-12T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: medium
- sec_items: 1.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1534969/000153496923000127/0001534969-23-000127-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1534969/000153496923000127/sera-20231206.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001534969-23-000127
- JSON: https://secwatch.observer/filing/0001534969-23-000127.json
- Plain text: https://secwatch.observer/filing/0001534969-23-000127.txt

## Key facts
- Material Agreements
  SERA PROGNOSTICS, INC. amended Amendment No. 2 with Baker Bros. Advisors LP and certain affiliates (effective 2023-12-06).
  - Action: amendment
  - Counterparty: Baker Bros. Advisors LP and certain affiliates
  - Effective: 2023-12-06
  source text: On December 6, 2023, Sera Prognostics, Inc. (the “Company”) entered into the second amendment (“Amendment No. 2”) to that certain Side Letter, dated as of April 29, 2021 (the “Side Letter”), previously amended effective February 16, 2023, with Baker Bros. Advisors LP and certain affiliates of Baker Bros. Advisors LP (collectively, “Baker Bros. Investors”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1534969/000153496923000127/0001534969-23-000127-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.