Form 4 for CBRS Cerebras Systems Inc.
Accepted 2026-08-21 20:58:34 ET · period of report 2026-08-20 · accession 0001628280-26-058506 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-08-21 20:58 | 2026-08-20+ | CBRS | Lie Sean | CTO | C - Cnv Deriv | $0.00 | +713.1K | 385.2K | New | $0 |
| D | 2026-08-21 20:58 | 2026-08-20 | CBRS | Lie Sean | CTO | G - Gift | $0.00 | -213.1K | 1.08M | -16% | $0 |
| DM | 2026-08-21 20:58 | 2026-08-20+ | CBRS | Lie Sean | CTO | S - Sale | $207.90 | -726.5K | 368.9K | -66% | -$151.05M |
| DM | 2026-08-21 20:58 | 2026-08-20+ | CBRS | Lie Sean | CTO | M - OptEx | $0.00 | 0 | 7.60M | New | $0 |
| DM | 2026-08-21 20:58 | 2026-08-20+ | CBRS | Lie Sean | CTO | C - Cnv Deriv | $0.00 | -713.1K | 7.58M | -9% | $0 |
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 | 2026-08-20 | C | A | 696,798 | — | 1,292,247 | D | — | — | (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. |
| 2 | Common | Class A Common Stock | 2026-08-20 | G | D | 213,074 | $0.00 | 1,079,173 | D | — | — | (F2) The reporting person transferred 213,074 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code. |
| 3 | Common | Class A Common Stock | 2026-08-20 | S | D | 11,706 | $203.78 | 1,067,467 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F4) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.18 to $204.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 4 | Common | Class A Common Stock | 2026-08-20 | S | D | 47,766 | $204.87 | 1,019,701 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F5) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.18 to $205.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 5 | Common | Class A Common Stock | 2026-08-20 | S | D | 133,383 | $205.67 | 886,318 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F6) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.18 to $206.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 6 | Common | Class A Common Stock | 2026-08-20 | S | D | 93,017 | $206.67 | 793,301 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F7) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.18 to $207.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 7 | Common | Class A Common Stock | 2026-08-20 | S | D | 108,507 | $207.68 | 684,794 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F8) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.18 to $208.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 8 | Common | Class A Common Stock | 2026-08-20 | S | D | 119,311 | $208.69 | 565,483 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F9) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.18 to $209.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 9 | Common | Class A Common Stock | 2026-08-20 | S | D | 114,976 | $209.86 | 450,507 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F10) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.18 to $210.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 10 | Common | Class A Common Stock | 2026-08-20 | S | D | 46,214 | $210.56 | 404,293 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F11) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.18 to $211.17, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 11 | Common | Class A Common Stock | 2026-08-20 | S | D | 10,715 | $211.42 | 393,578 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F12) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.21 to $212.12, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 12 | Common | Class A Common Stock | 2026-08-20 | S | D | 24,652 | $212.64 | 368,926 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F13) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $212.22 to $213.16, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 13 | Common | Class A Common Stock | 2026-08-21 | C | A | 16,293 | $0.00 | 385,219 | D | — | — | |
| 14 | Common | Class A Common Stock | 2026-08-21 | S | D | 16,293 | $210.01 | 368,926 | D | — | — | (F3) The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. (F14) The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.00 to $210.16, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. |
| 15 | Derivative | Stock Option | 2026-08-20 | M | D | 308,236 | $0.00 | 41,764 | D | $2.40 · — to 2029-05-13 | 308,236 Class B Common Stock | (F15) The stock option is fully vested and exercisable. |
| 16 | Derivative | Stock Option | 2026-08-20 | M | D | 138,236 | $0.00 | 36,764 | D | $2.72 · — to 2030-12-07 | 138,236 Class B Common Stock | (F15) The stock option is fully vested and exercisable. |
| 17 | Derivative | Stock Option | 2026-08-20 | M | D | 87,326 | $0.00 | 12,674 | D | $7.89 · — to 2032-01-11 | 87,326 Class B Common Stock | (F15) The stock option is fully vested and exercisable. |
| 18 | Derivative | Stock Option | 2026-08-20 | M | D | 114,455 | $0.00 | 35,545 | D | $5.02 · — to 2033-02-13 | 114,455 Class B Common Stock | (F16) The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023. |
| 19 | Derivative | Stock Option | 2026-08-20 | M | D | 48,545 | $0.00 | 351,455 | D | $5.48 · — to 2034-02-06 | 48,545 Class B Common Stock | (F17) The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. |
| 20 | Derivative | Class B Common Stock | 2026-08-20 | M | A | 696,798 | $0.00 | 8,279,790 | D | — · — to — | 696,798 Class A Common Stock | (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. |
| 21 | Derivative | Class B Common Stock | 2026-08-20 | C | D | 696,798 | $0.00 | 7,582,992 | D | — · — to — | 696,798 Class A Common Stock | (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. |
| 22 | Derivative | Stock Option | 2026-08-21 | M | D | 16,293 | $0.00 | 335,162 | D | $5.48 · — to 2034-02-06 | 16,293 Class B Common Stock | (F17) The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. |
| 23 | Derivative | Class B Common Stock | 2026-08-21 | M | A | 16,293 | $0.00 | 7,599,285 | D | — · — to — | 16,293 Class A Common Stock | (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. |
| 24 | Derivative | Class B Common Stock | 2026-08-21 | C | D | 16,293 | $0.00 | 7,582,992 | D | — · — to — | 16,293 Class A Common Stock | (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. (F1) The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. |