Guaranty Bancorp in Denver filed an amendment to a 2010 registration statement that lets certain investors sell stock over time.

The $2.1 billion-asset company's original prospectus allowed Patriot Financial Partners and Castle Creek Capital Partners to reduce their holdings over time. While the filing allow investors to sell shares, they may choose not to sell any of their holdings.

Guaranty, after amending its 2012 annual report, "was temporarily not eligible to utilize Form S-3," the company said in its recent filing. The amended prospectus was filed “to update the documents incorporated by reference into the prior registration statement and certain other information.” No additional shares were included in the new filing.

Patriot and Castle Creek, which led a $59 million recapitalization of Guaranty in May 2009, would be allowed to collectively sell nearly 5.3 million shares of common stock.

The original prospectus registered roughly 3.5 shares tied to two Patriot funds and 2.4 million shares held by a Castle Creek fund. That filing also registered more than 3.5 million shares held by a pair of funds affiliated with Relational Investors.

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Corrected March 31, 2015 at 4:40PM: The original version of this article erroneously implied that Guaranty Bancorp had filed a new registration statement. The company actually filed an amendment to a 2010 registration statement.