20. Loss Per Share

Basic and diluted loss per share were calculated as follows (shares in thousands):

			December 28, 2019			December 29, 2018			December 30, 2017
Basic Loss Per Share
Numerator for basic loss per share
	Loss attributable to SunOpta Inc.		$	(758	)	$	(109,205	)	$	(135,320	)
	Less: dividends and accretion on Series A Preferred Stock			(8,022	)		(7,909	)		(7,809	)
	Loss attributable to common shareholders		$	(8,780	)	$	(117,114	)	$	(143,129	)

Denominator for basic loss per share
	Basic weighted-average number of shares outstanding			87,787			87,082			86,355

Basic loss per share			$	(0.10	)	$	(1.34	)	$	(1.66	)

Diluted Loss Per Share
Numerator for diluted loss per share
	Loss attributable to SunOpta Inc.		$	(758	)	$	(109,205	)	$	(135,320	)
	Less: dividends and accretion on Series A Preferred Stock⁽¹⁾			(8,022	)		(7,909	)		(7,809	)
	Loss attributable to common shareholders		$	(8,780	)	$	(117,114	)	$	(143,129	)

Denominator for diluted loss per share
	Basic weighted-average number of shares outstanding			87,787			87,082			86,355
	Dilutive effect of the following:
		Series A Preferred Stock⁽¹⁾		—			—			—
		Stock options and restricted stock units⁽²⁾		—			—			—
	Diluted weighted-average number of shares outstanding			87,787			87,082			86,355

Diluted loss per share			$	(0.10	)	$	(1.34	)	$	(1.66	)

(1) For the years ended December 28, 2019, December 29, 2018 and December 30, 2017, it was more dilutive to assume the Preferred Stock was not converted into Common Shares, and, therefore, the numerator of the diluted loss per share calculation was not adjusted to add back the dividends and accretion on the Preferred Stock and the denominator was not adjusted to include 11,333,333 Common Shares issuable on an if-converted basis.

(2) For the years ended December 28, 2019, December 29, 2018 and December 30, 2017, stock options and RSUs to purchase or receive 370,670, 452,316 and 815,952 Common Shares, respectively, were excluded from the calculation of diluted loss per share due to their anti-dilutive effect of reducing the loss per share. In addition, for the years ended December 28, 2019, December 29, 2018 and December 30, 2017, options to purchase 3,528,899, 2,384,249 and 2,540,189 Common Shares were anti-dilutive because the exercise prices of these options were greater than the average market price.