X0306 4 2018-01-04 0 0000764579 CAS MEDICAL SYSTEMS INC CASM 0001601391 Acuta Capital Fund, LP 1301 SHOREWAY ROAD SUITE 350 BELMONT CA 94002 0 0 1 0 Common Stock 2017-07-25 4 P 0 6320 1.177 A 3244778 D Common Stock 2017-07-26 4 P 0 59228 1.1971 A 3304006 D Common Stock 2017-07-27 4 P 0 2088 1.1838 A 3306094 D Common Stock 2017-07-28 4 P 0 10287 1.1876 A 3316381 D Common Stock 2017-07-31 4 P 0 1340 1.185 A 3317721 D Common Stock 2017-08-01 4 P 0 3400 1.18 A 3321121 D Common Stock 2017-08-02 4 P 0 1292 1.1753 A 3322413 D Common Stock 2017-08-03 4 P 0 4051 1.171 A 3326464 D Common Stock 2017-08-04 4 P 0 2624 1.1789 A 3329088 D Common Stock 2017-08-07 4 P 0 2311 1.1813 A 3331399 D Common Stock 2017-08-08 4 P 0 26384 0.9856 A 3357783 D Common Stock 2017-08-09 4 P 0 4080 0.9917 A 3361863 D Common Stock 2017-08-10 4 P 0 8656 0.9823 A 3370519 D Common Stock 2017-08-11 4 P 0 5440 1.0018 A 3375959 D Common Stock 2017-08-15 4 P 0 2720 0.9649 A 3378679 D Common Stock 2017-08-16 4 P 0 333 0.99 A 3379012 D Common Stock 2017-08-17 4 P 0 4284 0.9648 A 3383296 D Common Stock 2017-08-18 4 P 0 1565 0.9909 A 3384861 D Common Stock 2017-08-22 4 P 0 816 0.985 A 3385677 D Common Stock 2017-08-23 4 P 0 5576 0.9595 A 3391253 D Common Stock 2017-08-24 4 P 0 2720 0.9525 A 3393973 D Common Stock 2017-08-29 4 P 0 1088 0.9279 A 3395061 D Common Stock 2017-09-07 4 P 0 2464 0.8857 A 3397525 D Common Stock 2017-09-08 4 P 0 222 0.90 A 3397747 D Common Stock 2017-12-13 4 P 0 2070 0.6207 A 3399817 D Common Stock 2017-12-14 4 P 0 5520 0.6263 A 3405337 D Common Stock 2017-12-15 4 P 0 3450 0.638 A 3408787 D Common Stock 2017-12-18 4 P 0 2760 0.6559 A 3411547 D Common Stock 2017-12-19 4 P 0 7476 0.6481 A 3419023 D Common Stock 2017-12-26 4 P 0 9660 0.7161 A 3428683 D The shares were purchased in multiple transactions at prices ranging from $1.15 to $1.19 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.17 to $1.25 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.18 to $1.19 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.17 to $1.20 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.18 to $1.19 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.17 to $1.18 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.16 to $1.18 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.17 to $1.19 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $1.18 to $1.19 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.955 to $1.02 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.99 to $1.00 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.958 to $0.998 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.98 to $1.01 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.9598 to $0.97 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.9499 to $1.00 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.99 to $1.00 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.98 to $0.99 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.95 to $0.99 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.95 to $0.96 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.91 to $0.96 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.87 to $0.89 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.6189 to $0.6299 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.6199 to $0.6388 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.6299 to $0.65 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.648 to $0.6787 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.6396 to $0.669 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The shares were purchased in multiple transactions at prices ranging from $0.6796 to $0.72 per share. The price reported reflects the volume weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Due to limitations of the electronic filing system, this Form 4 is being filed in multiple parts. This is part 3 of 4. Acuta Capital Fund, LP, by its general partner, Acuta Capital Partners, LLC, /s/ Manfred Yu, CCO & COO 2018-05-01