13. Loss Per Share

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

			Quarter ended						Three quarters ended
			September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Basic Loss Per Share
Numerator for basic loss per share
	Earnings (loss) attributable to SunOpta Inc.		$	(11,749	)	$	(4,606	)	$	4,845		$	(12,143	)
	Less: dividends and accretion on Series A Preferred Stock			(2,009	)		(1,981	)		(6,005	)		(5,922	)
	Loss attributable to common shareholders		$	(13,758	)	$	(6,587	)	$	(1,160	)	$	(18,065	)

Denominator for basic loss per share
	Basic weighted-average number of shares outstanding			87,928			87,168			87,695			86,982

Basic loss per share			$	(0.16	)	$	(0.08	)	$	(0.01	)	$	(0.21	)

Diluted Loss Per Share
Numerator for diluted loss per share
	Earnings (loss) attributable to SunOpta Inc.		$	(11,749	)	$	(4,606	)	$	4,845		$	(12,143	)
	Less: dividends and accretion on Series A Preferred Stock⁽¹⁾			(2,009	)		(1,981	)		(6,005	)		(5,922	)
	Loss attributable to common shareholders		$	(13,758	)	$	(6,587	)	$	(1,160	)	$	(18,065	)

Denominator for diluted loss per share
	Basic weighted-average number of shares outstanding			87,928			87,168			87,695			86,982
	Dilutive effect of the following:
		Series A Preferred Stock⁽¹⁾		—			—			—			—
		Stock options and restricted stock units⁽²⁾		—			—			—			—
	Diluted weighted-average number of shares outstanding			87,928			87,168			87,695			86,982

Diluted loss per share			$	(0.16	)	$	(0.08	)	$	(0.01	)	$	(0.21	)

(1) For the quarters and three quarters ended September 28, 2019 and September 29, 2018, it was more dilutive to assume the Preferred Stock was not converted into Common Shares and, therefore, the numerator of the diluted earnings/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 quarter and three quarters ended September 28, 2019, stock options and restricted stock units to purchase or receive 59,981 (September 29, 2018 - 625,167) and 105,486 (September 29, 2018 - 575,776) 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 28, 2019, options to purchase 4,248,761 (September 29, 2018 - 1,864,830) and 3,318,583 (September 29, 2018 - 1,986,406) Common Shares, respectively, were anti-dilutive because the exercise prices of these options were greater than the average market price.