To clear up confusion from earlier today, Andreessen Horowitz is not selling its stake in Facebook. Rather, the firm is transfering ownership of the additional shares it received when Facebook bought Instagram. Those shares will be distributed to its LPs (limited partners, aka. investors). Founding partner Marc Andreessen, however, filed with the SEC today to sell a small number of the shares he received personally for being a director in the company to cover his tax liability. Accel partner Jim Bryer, also an Instagram director did the same a month ago. [Source Andreessen Horowitz]