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Amesbury-based The Provident Bank faces a big day Wednesday, when its long-planned effort to go fully public will culminate in a stock offering.

The bank will be offering 10.21 million shares at an initial price of $10 per share, according to SEC filings. The subscription and community offerings are being managed by Sandler O’Neill & Partners L.P. The bank must sell at least 9.77 million shares between 10 a.m. and 4 p.m. tomorrow.

The offering comes more than four years after Provident issued a partial IPO in 2015 when it offered 4.2 million shares of common stock for sale at $10 per share, representing 45 percent of its outstanding shares of common stock. The offering was originally unveiled in a regulatory filing this summer, one of the few mutual conversions expected among Massachusetts banks in the near future.

Since that time, the bank has grown from about $663 million in assets to $1 billion and managed to grow its return on assets to 1.01 percent in the second quarter of this year. In recent years, Provident Bank has also shifted its business model to focus more on international small business lending, and as a result, has grown its commercial and industrial loan portfolio.

The second-step conversion by Provident is the second by a Massachusetts bank this year, following HarborOne in March.

The bank is also one of the few nationally to wade into the waters of cryptocurrency, having announced in July that it planned to offer deposit services to cryptocurrency-related clients.