Subject: File No. SR-NYSEArca-2021-90
From: William M. Mahlburg
Affiliation:

May. 08, 2022

Greetings, 
I am writing in support of converting Grayscale Bitcoin Trust to an ETF format. This change should result in more realistic tracking of GBTC value to Bitcoin. This change is warranted as Bitcoin matures as a currency and investment. 


Thank you for your consideration of this comment. 


William M Mahlburg