The Supreme Liberty Life Insurance Company (an Illinois corporation) was liquidated by court order on September 23, 1932 during the Great Depression.
Its assets were transferred to a newly formed entity, the Supreme Liberty Life Insurance Company of America. The transfer agent for this transaction was the National Boulevard Bank of Chicago.
This was a regulatory rehabilitation/liquidation process, not a private acquisition. Policyholders' claims were assumed by the successor company under court supervision. The National Boulevard Bank (later part of Bank of America lineage) handled the financial transfer mechanics.
If you hold an old policy or stock certificate, it likely has no current value, but you could contact the Illinois Department of Insurance or the successor's modern equivalent (if traceable) for historical records.