15.03.2023 • News

Pfizer Takes Seagen for $43 Billion

Pfizer has agreed to acquire Seagen, a global biotech focused on developing cancer treatments, for $43 billion. The announcement comes just a couple of weeks after the Wall Street Journal reported that the two companies were in talks.

Both boards have approved the transaction, which is expected to close in late 2023 or early 2024. Pfizer said it plans to pay for the acquisition mostly through $31 billion of new, long-term debt.

Regarding itself as a pioneer in antibody-drug conjugates (ADCs), Seagen adds four commercial drugs to Pfizer’s cancer portfolio — Adcetris, Padcev, Tukysa and Tivdak — together with a robust pipeline of ADC candidates.

“The addition of Seagen’s world-leading ADC technology will position us at the forefront of innovative cancer care, and strongly complements our existing portfolio across both solid tumors and hematologic malignancies,” said Chris Boshoff, Pfizer’s chief development officer oncology and rare disease.

© Pfizer
© Pfizer

Pfizer’s oncology offering comprises 24 approved medicines that generated $12.1 billion of revenue last year. The pharma giant said it expects Seagen’s drugs, which had revenues in of $2 billion in 2022, to add annual revenues of $10 million by 2030.

During a conference call on Mar. 13 to announce the acquisition, Pfizer CEO Albert Bourla said: “We are not buying the golden eggs. We are acquiring the goose that is laying the golden eggs.”

The deal is reported to be the largest biopharma acquisition since June 2019, when AbbVie paid $63 billion for Allergan. And Pfizer has been particularly acquisitive in the past couple of years, taking cancer specialists Trillium Therapeutics in November 2021 for $2.2 billion, followed in March 2022 by Arena Pharmaceuticals for $6.7 billion.

Last October, Pfizer also closed its $11.6 billion takeover of Biohaven Pharmaceuticals, as well as its $5.4 billion buyout of Global Blood Therapeutics.

Author: Elaine Burridge, Freelance Journalist

Free Virtual Event

Batteries and Hydrogen: Competitors or Partners?
CHEManager Spotlight

Batteries and Hydrogen: Competitors or Partners?

17 September 2026 | Reserve your spot to learn where solid-state batteries and green hydrogen are headed—and how leading teams are turning them into scalable energy storage solutions.

Expert Insights

ADCs for Precision Cancer Therapy
Comprehensive Insights into Antibody–Drug Conjugates

ADCs for Precision Cancer Therapy

Explore how antibody-drug conjugates are reshaping precision cancer therapy and discover what it takes to successfully develop, manufacture, and scale these complex biologics.

most read

Photo

VCI Welcomes US-EU Customs Deal

The German Chemical Industry Association (VCI) welcomes the fact that Ursula von der Leyen, President of the European Commission, and US President Donald Trump have averted the danger of a trade war for the time being.