11. Loss Per Share

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

		Quarter ended						Three quarters ended
		September 26, 2020			September 28, 2019			September 26, 2020			September 28, 2019
Basic Loss Per Share
Numerator for basic earnings (loss) per share
Earnings (loss) attributable to SunOpta Inc.		$89			$(11,749)			$4,457			$4,845
Less: dividends and accretion on Series A Preferred Stock		(2,110)			(2,009)			(6,201)			(6,005)
Less: dividends and accretion on Series B Preferred Stock		(734)			—			(1,272)			—
Loss attributable to common shareholders		$(2,755)			$(13,758)			$(3,016)			$(1,160)

Denominator for basic earnings (loss) per share
Basic weighted-average number of shares outstanding		89,635			87,928			88,962			87,695

Basic loss per share		$(0.03)			$(0.16)			$(0.03)			$(0.01)

Diluted Loss Per Share
Numerator for diluted earnings (loss) per share
Earnings (loss) attributable to SunOpta Inc.	$	89		$	(11,749	)	$	4,457		$	4,845
Less: dividends and accretion on Series A Preferred Stock		(2,110	)		(2,009	)		(6,201	)		(6,005	)
Less: dividends and accretion on Series B Preferred Stock		(734	)		—			(1,272	)		—
Loss attributable to common shareholders	$	(2,755	)	$	(13,758	)	$	(3,016	)	$	(1,160	)

Denominator for diluted loss per share
Basic weighted-average number of shares outstanding		89,635			87,928			88,962			87,695
Dilutive effect of the following:
Stock options and restricted stock units⁽¹⁾		—			—			—			—
Series B Preferred Stock⁽²⁾		—			—			—			—
Series A Preferred Stock⁽³⁾		—			—			—			—
Diluted weighted-average number of shares outstanding		89,635			87,928			88,962			87,695

Diluted loss per share	$	(0.03	)	$	(0.16	)	$	(0.03	)	$	(0.01	)

(1) For the quarter and three quarters ended September 26, 2020, stock options and restricted stock units to purchase or receive 1,360,975 (September 28, 2019 - 59,981) and 975,742 (September 28, 2019 - 105,486) 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 quarter and three quarters ended September 26, 2020, stock options to purchase 1,767,856 (September 28, 2019 - 4,248,761) and 3,286,487 (September 28, 2019 - 3,318,583) Common Shares, respectively, were anti-dilutive because the exercise prices of these options were greater than the average market price.

(2) For the quarter and three quarters ended September 26, 2020, it was more dilutive to assume the Series B Preferred Stock was not converted into Common Shares and, therefore, the numerator of the diluted earnings per share calculation was not adjusted to add back the dividends and accretion on the Series B Preferred Stock and the denominator was not adjusted to include 12,178,667 Common Shares issuable on an if-converted basis as at September 26, 2020.

(3) For the quarters and three quarters ended September 26, 2020 and September 28, 2019, it was more dilutive to assume the Series A Preferred Stock was not converted into Common Shares and, therefore, the numerator of the diluted earnings per share calculation was not adjusted to add back the dividends and accretion on the Series A Preferred Stock and the denominator was not adjusted to include 12,633,429 and 11,333,333 Common Shares issuable on an if-converted basis as at September 26, 2020 and September 28, 2019, respectively.