X0306 4 2018-06-08 0 0001419041 Tocagen Inc TOCA 0001701643 Jolly Douglas C/O TOCAGEN INC. 4242 CAMPUS POINT COURT, SUITE 500 SAN DIEGO CA 92121 0 1 0 0 EVP, Research & Pharm Devel Common Stock 2018-06-08 5 A 0 E 703 8.19 A 392746 D Common Stock 2018-12-10 5 A 0 E 732 8.19 A 393478 D Common Stock 21739 I By son Common Stock 21739 I By daughter This Form 4 is being filed voluntarily to report the acquisition of 703 shares by the Reporting Person on June 8, 2018 pursuant to the Issuer's Employee Stock Purchase Plan. This Form 4 is being filed voluntarily to report the acquisition of 732 shares by the Reporting Person on December 10, 2018 pursuant to the Issuer's Employee Stock Purchase Plan. The Reporting Person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/ Mark Foletta, Attorney-in-Fact 2019-05-29