For those interested in keeping tabs of SEC filings :
SEC database search for Livent :
https://research.secdatabase.com/CIK/1742924/Company-Name/LIVENT-CORP.
SEC database search for Arcadium :
https://research.secdatabase.com/CIK/1977303/Company-Name/ARCADIUM-LITHIUM-PLC
Use a service that keeps track of these changes to get informed of any new updates.
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