Form 4 for CBRS Cerebras Systems Inc.
Accepted 2026-08-18 18:38:56 ET · period of report 2026-06-24 · accession 0001567929-26-000003 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DMI | 2026-08-18 18:38 | 2026-06-24+ | CBRS | Vassallo Steven | Dir | C - Cnv Deriv | — | +1.91M | 136.4K | New | — |
| DMI | 2026-08-18 18:38 | 2026-08-14 | CBRS | Vassallo Steven | Dir | J - Other | $0.00 | -1.76M | 50.9K | -97% | $0 |
| DMI | 2026-08-18 18:38 | 2026-08-14 | CBRS | Vassallo Steven | Dir | S - Sale | $218.18 | -50.0K | 49.6K | -50% | -$10.91M |
| DMI | 2026-08-18 18:38 | 2026-06-24+ | CBRS | Vassallo Steven | Dir | C - Cnv Deriv | — | -1.91M | 955.0K | -67% | — |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Class A Common Stock | 2026-06-24 | C | A | 1,391,131 | — | 1,391,131 | I By Foundation Capital VIII, L.P. | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F2) Securities are directly held by Foundation Capital VIII, L.P. ("FC8"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 2 | Common | Class A Common Stock | 2026-06-24 | C | A | 29,963 | — | 29,963 | I By Foundation Capital VIII Principals Fund, LLC | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F3) Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. ("FC8P"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 3 | Common | Class A Common Stock | 2026-06-24 | C | A | 109,141 | — | 109,141 | I By Foundation Capital Leadership Fund II, L.P. | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. |
| 4 | Common | Class A Common Stock | 2026-08-14 | C | A | 347,782 | — | 1,738,913 | I By Foundation Capital VIII, L.P. | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F2) Securities are directly held by Foundation Capital VIII, L.P. ("FC8"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 5 | Common | Class A Common Stock | 2026-08-14 | C | A | 7,490 | — | 37,453 | I By Foundation Capital VIII Principals Fund, L.L.C. | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F3) Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. ("FC8P"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 6 | Common | Class A Common Stock | 2026-08-14 | C | A | 27,285 | — | 136,426 | I By Foundation Capital Leadership Fund II, L.P. | — | — | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F4) Securities are directly held by Foundation Capital Leadership Fund II, L.P. ("FCLF2"). Foundation Capital Management Co. LF II, L.L.C. ("FCMLF2") is the general partner of FCLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 7 | Common | Class A Common Stock | 2026-08-14 | J | D | 1,738,913 | $0.00 | 0 | I By Foundation Capital VIII, L.P. | — | — | (F5) Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FC8 to its general partner and limited partners without additional consideration. (F2) Securities are directly held by Foundation Capital VIII, L.P. ("FC8"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 8 | Common | Class A Common Stock | 2026-08-14 | J | D | 37,453 | $0.00 | 0 | I By Foundation Capital VIII Principals Fund, L.L.C. | — | — | (F6) Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FC8P to its general partner and limited partners without additional consideration. (F3) Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. ("FC8P"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 9 | Common | Class A Common Stock | 2026-08-14 | J | D | 136,426 | $0.00 | 0 | I By Foundation Capital Leadership Fund II, L.P. | — | — | (F7) Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FCLF2 to its general partner and limited partners without additional consideration. (F4) Securities are directly held by Foundation Capital Leadership Fund II, L.P. ("FCLF2"). Foundation Capital Management Co. LF II, L.L.C. ("FCMLF2") is the general partner of FCLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 10 | Common | Class A Common Stock | 2026-08-14 | J | A | 449,885 | $0.00 | 449,885 | I By Foundation Capital Management Co. VIII, L.L.C. | — | — | (F8) Represents receipt of shares in the distributions in kind described in footnotes (5) and (6). (F9) Securities are directly held by FCM8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 11 | Common | Class A Common Stock | 2026-08-14 | J | D | 449,885 | $0.00 | 0 | I By Foundation Capital Management Co. VIII, L.L.C. | — | — | (F10) Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FCM8 to its members without additional consideration. (F9) Securities are directly held by FCM8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 12 | Common | Class A Common Stock | 2026-08-14 | J | A | 1,368 | $0.00 | 1,368 | I By Foundation Capital Management Co. LF II, L.L.C. | — | — | (F11) Represents receipt of shares in the distribution in kind described in footnote (7). (F12) Securities are directly held by FCMLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 13 | Common | Class A Common Stock | 2026-08-14 | J | A | 99,599 | $0.00 | 99,599 | I By Revocable Trust | — | — | (F13) Represents receipt of shares in the distributions in kind described in footnotes (6) and (10). (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 14 | Common | Class A Common Stock | 2026-08-14 | J | A | 50,944 | $0.00 | 50,944 | I By Irrevocable Trust | — | — | (F15) Represents receipt of shares in the distribution in kind described in footnote (10). (F16) The securities are held by an irrevocable GST trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| 15 | Common | Class A Common Stock | 2026-08-14 | S | D | 6,081 | $216.38 | 93,518 | I By Revocable Trust | — | — | (F17) The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $215.79 to $216.78 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote. (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 16 | Common | Class A Common Stock | 2026-08-14 | S | D | 16,671 | $217.47 | 76,847 | I By Revocable Trust | — | — | (F18) The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $216.87 to $217.86 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote. (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 17 | Common | Class A Common Stock | 2026-08-14 | S | D | 11,834 | $218.46 | 65,013 | I By Revocable Trust | — | — | (F19) The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $217.90 to $218.89 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote. (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 18 | Common | Class A Common Stock | 2026-08-14 | S | D | 14,323 | $219.41 | 50,690 | I By Revocable Trust | — | — | (F20) The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $218.90 to $219.89 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote. (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 19 | Common | Class A Common Stock | 2026-08-14 | S | D | 1,091 | $219.97 | 49,599 | I By Revocable Trust | — | — | (F21) The price reported in Column 4 is a weighted average price. These securities were sold in multiple transactions at prices ranging from $219.90 to $220.15 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of securities sold at each separate price within the range set forth in this footnote. (F14) The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein. |
| 20 | Derivative | Class B Common Stock | 2026-06-24 | C | D | 1,391,131 | — | 12,520,174 | I By Foundation Capital VIII, L.P. | — · — to — | 1,391,131 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F2) Securities are directly held by Foundation Capital VIII, L.P. ("FC8"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 21 | Derivative | Class B Common Stock | 2026-06-24 | C | D | 29,963 | — | 269,664 | I By Foundation Capital VIII Principals Fund, LLC | — · — to — | 29,963 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F3) Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. ("FC8P"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 22 | Derivative | Class B Common Stock | 2026-06-24 | C | D | 109,141 | — | 982,270 | I By Foundation Capital Leadership Fund II, L.P. | — · — to — | 109,141 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F4) Securities are directly held by Foundation Capital Leadership Fund II, L.P. ("FCLF2"). Foundation Capital Management Co. LF II, L.L.C. ("FCMLF2") is the general partner of FCLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 23 | Derivative | Class B Common Stock | 2026-08-14 | C | D | 347,782 | — | 12,172,392 | I By Foundation Capital VIII, L.P. | — · — to — | 347,782 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F2) Securities are directly held by Foundation Capital VIII, L.P. ("FC8"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 24 | Derivative | Class B Common Stock | 2026-08-14 | C | D | 7,490 | — | 262,174 | I By Foundation Capital VIII Principals Fund, LLC | — · — to — | 7,490 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F3) Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. ("FC8P"). Foundation Capital Management Co. VIII, L.L.C. ("FCM8") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |
| 25 | Derivative | Class B Common Stock | 2026-08-14 | C | D | 27,285 | — | 954,985 | I By Foundation Capital Leadership Fund II, L.P. | — · — to — | 27,285 Class A Common Stock | (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F1) Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F22) Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and does not expire. (F4) Securities are directly held by Foundation Capital Leadership Fund II, L.P. ("FCLF2"). Foundation Capital Management Co. LF II, L.L.C. ("FCMLF2") is the general partner of FCLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. |