---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-048997"
form_type: "8-K"
ticker: "TWST"
cik: "0001581280"
company_name: "Twist Bioscience Corp"
filed_at: "2022-04-22T23:59:59+00:00"
generated_at: "2026-06-26T05:21:28.733344+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Twist Bioscience COO Patrick Weiss steps down; internal promotions announced

## Summary
- Patrick Weiss resigns as COO effective April 21, 2022, for personal reasons; will stay as strategic advisor.
- Tracey Mullen promoted to SVP of Operations; she joined via the Abveris acquisition in November 2021.
- Nimisha Srivastava promoted to SVP of R&D; she has been with Twist since 2014, leading engineering.
- Company initiates formal search for a new COO.

## SEC filing metadata
- accession: 0001104659-22-048997
- form_type: 8-K
- ticker: TWST
- cik: 0001581280
- company_name: Twist Bioscience Corp
- filed_at: 2022-04-22T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1581280/000110465922048997/0001104659-22-048997-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1581280/000110465922048997/tm2213223d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-048997
- JSON: https://secwatch.observer/filing/0001104659-22-048997.json
- Plain text: https://secwatch.observer/filing/0001104659-22-048997.txt

## Key facts
- Executive change
  Patrick Weiss departed as Chief Operating Officer at Twist Bioscience Corp.
  - Action: stepping down
  - Role: Chief Operating Officer
  source text: On April 20, 2022, Patrick Weiss notified Twist Bioscience Corporation (the “Company”) that he is stepping down as the Company’s Chief Operating Officer effective April 21, 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1581280/000110465922048997/0001104659-22-048997-index.htm

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