Who owns Cortrosyn?
Cortrosyn is owned by Amphastar (the United States, NASDAQ: AMPH).[1]
Evidence: Amphastar Pharmaceuticals, Inc. Annual Report on Form 10-K filed 2026-02-26, SEC EDGAR, 26 February 2026. Verified from filings; last checked .
Key facts
- Current owner
- Amphastar Pharmaceuticals, Inc. verified
- Owner HQ
- 🇺🇸 United States, Rancho Cucamonga
- Origin
- 🇺🇸 United States
- Category
- Healthcare & pharma › Drug makers › Pharmaceuticals
- Parent ticker
- NASDAQ: AMPH
- Last verified
- · 1 sources
About Cortrosyn
Cortrosyn is a lyophilized powder of cosyntropin for injection, indicated as a diagnostic agent in screening patients for adrenocortical insufficiency. Amphastar's 10-K names it as one of three products the company has acquired, with BAQSIMI and Primatene MIST, and lists it among its other marketed products without stating when or from whom the rights were bought.
Ownership timeline of Cortrosyn
Where Cortrosyn sits in Amphastar
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full Amphastar ownership tree →
See the full Amphastar brand portfolio (4) →
Other brands owned by Amphastar
Amphastar controls 4 brands on Brandtree, 4 of them in healthcare & pharma.
Also in healthcare & pharma
Other brands in pharmaceuticals, and who owns them
The 27 brands in pharmaceuticals on Brandtree belong to 10 owners. The largest is Teva, with 4; Amphastar has 4.
About the owner: Amphastar
Amphastar is a publicly listed company headquartered in Rancho Cucamonga, United States, founded in 1996. Brandtree records 4 brands under its control, and it is listed as NASDAQ: AMPH.
Amphastar Pharmaceuticals, Inc. is a biopharmaceutical company based in Rancho Cucamonga, California. It incorporated in California in 1996 and reincorporated in Delaware in 2004. Its 10-K for 2025 says it develops, makes and sells technically challenging generic and proprietary injectable, inhalation and intranasal products and active pharmaceutical ingredients, with net revenues of $719.9 million in 2025.
🇺🇸 Cortrosyn and other American brands
Brandtree records a controlling owner for 2,549 brands that began in the United States. 478 of them (19%) are now controlled by a company headquartered in another country; Cortrosyn is not one of them.
Frequently asked questions
Who is the parent company of Cortrosyn?
The parent company of Cortrosyn is Amphastar, a publicly listed company headquartered in the United States.
Is Cortrosyn American?
Yes. Cortrosyn originated in the United States and its owner, Amphastar, is also headquartered in the United States.
Is Cortrosyn still owned by Amphastar?
Yes. As of 18 October 2026, Cortrosyn is still owned by Amphastar. The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] Amphastar Pharmaceuticals, Inc. Annual Report on Form 10-K filed 2026-02-26 — SEC EDGAR, SEC Form 10-K, published 26 February 2026; retrieved 18 October 2026.
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