---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-131802"
form_type: "8-K"
ticker: "SEER"
cik: "0001726445"
company_name: "Seer, Inc."
filed_at: "2026-03-30T23:59:59+00:00"
generated_at: "2026-05-15T08:24:27.617028+00:00"
event_type: "litigation"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# PTAB upholds 23 claims of Seer's particle proteomics patent in Bruker challenge

## Summary
- PTAB Final Written Decision on March 23, 2026, upholds five challenged and 18 unchallenged claims of U.S. Patent No. 11,435,360.
- Patent covers protein enrichment using engineered nano- and microparticles, core to Seer's Proteograph platform.
- Petitioners PreOmics GmbH and Biognosys AG (Bruker subsidiaries) failed to show unpatentability of claims 2,3,7,23,24.
- Six claims (1,4,6,22,24,25) were found unpatentable; appeal deadline is May 25, 2026.
- '360 patent is owned by Brigham and Women's Hospital and exclusively licensed to Seer; CEO vows continued IP defense.

## SEC filing metadata
- accession: 0001193125-26-131802
- form_type: 8-K
- ticker: SEER
- cik: 0001726445
- company_name: Seer, Inc.
- filed_at: 2026-03-30T23:59:59+00:00
- event_type: litigation
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1726445/000119312526131802/0001193125-26-131802-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1726445/000119312526131802/ck0001726445-20260323.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-131802
- JSON: https://secwatch.observer/filing/0001193125-26-131802.json
- Plain text: https://secwatch.observer/filing/0001193125-26-131802.txt

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