He sold ALL he had. AFFY director Walker now has NO, or ZERO, AFFY shares. Ask yourself, why do AFFY longs have to lie about this? Go check out the S4 yourself. Go to sec dot gov, click on the upper right bar "Filings", next click "Search for Company Filings", next click "Company or fund name... etc", in the "Fast Search" type AFFY, on the next page under Ownership? check the circle for "include", and then to the right hit either the "Search" or "Show All".
You will then see a page with AFFY's filings. You will see under "Filings" the number 4 corresponding to Statement of changes in beneficial ownership of securities with a filing date of 2013-08-29. In the Format column click on "Documents".
On the next page, click under the Document column the red edgar.html. That brings up AFFY Director Walker's Form 4 that reports his sale of 16,540 AFFY shares for $1.92 share in Table I. Under item 5 it shows that after the sale Walker does not own any more AFFY. He does not "Own Plenty" as nyjohnnygrey would have you believe.
If it was an "automatic plan" mandating AFFY Director Walker's sale of his shares it would have to be disclosed.
For example, and to further verify what I say is true, go back to your search results and find the Form 4 filed for John Orwin's sale on 2013-06-28. When you read it, you will see that his sale of 16,334 shares at $1.02, footnote 2, was part of an "automatic plan" that nyjohnnygrey wants you to believe mandated Walker's sale. Footnote 2 discloses "The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan" His donation of 15,000 AFFY shares to an unaffiliated third party non-profit organization was a voluntary disposition. After these sales, Orwin still owned 76,666 AFFY shares.