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Exhibit 21

SUBSIDIARIES OF OLIN CORPORATION1

(As of December 31, 2024)

Company			Jurisdiction
Blue Cube Holding LLC			DE
Blue Cube Intermediate Holding 2 LLC			DE
Blue Cube International Holdings LLC			DE
Blue Cube IP LLC			DE
Blue Cube Operations LLC			DE
Blue Cube Spinco LLC			DE
Blue Water Alliance JV, LLC			DE
Henderson Groundwater LLC			NV
HPCM LLC			DE
Hunt Trading Co.			MO
Imperial West Chemical Co.			NV
K. A. Steel Chemicals Inc.			DE
K. A. Steel International Inc.			DE
KAS Muscatine LLC			IA
KNA California, Inc.(see footnote 2)			DE
KWT, Inc.			DE
Monarch Brass & Copper Corp.			NY
Monarch Brass & Copper of New England Corp.			RI
New Haven Copper Company			CT
Niloco BCN Holdings, LLC			DE
Niloco Global Holdings LLC			DE
Niloco Hydrogen Holdings LLC			DE
Olin Benefits Management, Inc.			CA
Olin Business Holdings			DE
Olin Chlor Alkali Logistics Inc.			DE
Olin Chlorine 7, LLC			DE
Olin Engineered Systems, Inc.			DE
Olin Far East, Limited			DE
Olin Finance Company, LLC			DE
Olin Financial Services Inc.			DE
Olin Funding Company LLC			DE
Olin North American Holdings, Inc.			DE
Olin Russellville Cell Technologies LLC			DE
Olin Winchester, LLC			DE
Pioneer Americas LLC			DE
Pioneer Companies, LLC			DE
Pioneer (East), Inc.			DE
Pioneer Licensing, Inc.			DE
Pioneer Transportation LLC			DE
Pioneer Water Technologies, Inc.			DE
Ravenna Arsenal, Inc.			OH
TriOlin, LLC			DE
Waterbury Rolling Mills, Inc.			CT
Winchester Ammunition, Inc.			DE
Winchester Defense, LLC			DE

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INTERNATIONAL
3229897 Nova Scotia Co.			Nova Scotia, Canada
BC Switzerland GmbH			Switzerland
Blue Cube Netherlands Holding C.V.			Netherlands
Blue Cube Brasil Comércio de Produtos Químicos Ltda. (See footnote 3 for Subordinates)			Brazil
Blue Cube Chemicals Hong Kong Limited			Hong Kong
Blue Cube Chemicals India Private Limited			India
Blue Cube Chemicals Italy S.r.l.			Italy
Blue Cube Chemical Korea Ltd.			Korea
Blue Cube Chemicals Singapore Pte. Ltd.			Singapore
Blue Cube Chemicals Singapore Pte. Ltd. Taiwan Branch			Taiwan
Blue Cube Chemicals South Africa Pty Ltd			South Africa
Blue Cube Chemicals (UK) Limited			United Kingdom
Blue Cube Chemicals (Zhangjiagang) Co., Ltd.			China
Blue Cube Chemicals (Zhangjiagang) Co., Ltd. Shanghai Branch			China
Blue Cube Denmark ApS			Denmark
Blue Cube Germany Assets GmbH & Co. KG			Germany
Blue Cube Germany Assets Management GmbH			Germany
Blue Cube Japan LLC			Japan
Blue Cube Mexico, S. de R.L. de C.V.			Mexico
Blue Cube Netherlands B.V.			Netherlands
Blue Cube Rasha OOO			Russia
Blue Cube (Thailand) Company Limited			Thailand
Blue Cube Turkey Kimyasal Ǜrűnler Limited Șirketi			Turkey
Blue Water Alliance Europe B.V.			Netherlands
Blue Water Alliance JV LLP			United Kingdom
BWA Japan Godo Kaisha			Japan
CANSO Chemicals Limited			Nova Scotia, Canada
Nedastra Holding B.V.			Netherlands
Niloco Cyprus Limited			Cyprus
Olin Canada ULC			Nova Scotia, Canada
Olin Cyprus Holdings Ltd.			Cyprus
Olin Germany AP LTP GmbH			Germany
Olin Germany Upstream GmbH & Co KG			Germany
Olin International Holdings Limited			United Kingdom
Olin Malta Holdings Limited			Malta
Winchester Australia Limited			Australia

Footnotes:

1 Omitted from the following list are the names of certain subsidiaries which, if considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary

2 In California only this entity conducts business under the name of Kemwater KNA California, Inc.

3 Subordinates of Blue Cube Brasil Comércio de Produtos Químicos Ltda.:

•Sāo Paulo Branch of Blue Cube Brasil Comércio de Produtos Químicos Ltda.

•Bahia Branch of Blue Cube Brasil Comércio de Produtos Químicos Ltda. (Caustic Soda)

•Paraná Branch of Blue Cube Brasil Comércio de Produtos Químicos Ltda. (Caustic Soda)