Since I'm about to participate in an HWA Roundtable on Sexism in Horror (and since - if anything - it seems to be an even bigger topic in 2013 than it was in 2010), here's an updated survey.
My brilliant methodology: I frankly didn't take the time to actually figure out which releases were from 2013, so in most of these cases I just used the company's current in-stock listings on their websites. If there were two or more authors listed on a book, I counted each one as a separate title. If the book was an anthology, I used only the editor. I tried not to include each edition of a book, but counted a book only once, regardless of separate listings for the e-book, signed/limited, etc. I wanted to include JournalStone, but I was having trouble accessing their website today. And yes, I know that Stephen King probably skews the results unfairly in the case of Cemetery Dance.
In one case (Chizine), I used their "Authors" page rather than a stock listing of books.
|Bad Moon||CD||Chizine||Dark Fuse||Dark Regions||PS||Samhain||TOTALS|
Yes, women horror writers have gained over TWO WHOLE PERCENT in the last three years. Try not to celebrate too loudly, now - we wouldn't want to disturb anyone, after all.
EDITED TO ADD: Sorry, I had to disable comments on this because I was getting spammed to death, not because I didn't want to continue the conversation...