Deal Flow
Letter · prints on one page
Transaction tear sheetData as of Nov 7, 2026
M&A · Healthcare · Pharmaceutical Preparations

GlaxoSmithKline PLC to acquire Sierra Oncology, Inc.

Announced Apr 13, 2022 · Closed Jul 1, 2022

Deal value$1.90BEV $1.80B
Premium39.0%To unaffected price
EV / Adj. EBITDA—
ConsiderationAll cash$55.00 per share

Transaction

Acquirer
GlaxoSmithKline PLC (GSK)
Target
Sierra Oncology, Inc.
Buyer type
Strategic
Offer price per share
$55.00
Enterprise value
$1.80B
Status
Closed Jul 1, 2022

Deal protections

Break fee (target pays)
$70.0M · 3.7%
Reverse fee (buyer pays)
—
Go-shop
No-shop
Financing
No financing condition

Advisors

To the acquirer
PJT Partners
To the target
Lazard
Lazard fee
$44.0M

Sector context · Healthcare

Comparable deals
40 in the prior 24 months
Premium
39.0% vs. 46.0% sector median
EV / Adj. EBITDA
Sector median 20.4x
Break fee
3.7% vs. 3.3% sector median

Timeline

  1. AnnouncedApr 13, 2022
  2. Proxy filedMay 2, 2022
  3. Definitive proxyMay 16, 2022
  4. Shareholder voteJun 29, 2022
  5. ClosedJul 1, 2022

Valuation · fairness opinions

Discounted cash flow$38.05$43.45
Trading comparables$27.05$37.65
Precedent transactions$27.05$44.75
Trading comparables$59.05$80.90
Trading comparables$53.20$74.60
Offer $55.00

Implied value per Sierra Oncology, Inc. share by analysis, from Lazard · DCF discount rate 10%–12%.

Sources
  • 8-K (EX-99) · Apr 13, 2022
  • 8-K · Apr 13, 2022

Adj. EBITDA is operating income + D&A + impairment, restructuring, deal costs and stock compensation, less any large gain on a sale, last twelve months, from the target's filings. Calculated by Castle, so it can differ from a bank's adjusted figure.

Prepared with Castle from public SEC EDGAR filings. Figures are extracted automatically; verify against the source documents. Not investment advice.