Cerebras Systems (CBRS) Stock Concentration Calculator
Calculator · free · no signup · CBRSQuantify Cerebras Systems concentration risk. Drawdown impact at 30 / 50 / 70%, with the tax-aware trade-off between selling down and hedging.
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Most fee-only advisors target ≤10% in any single name. You're at 67%.
Estimates only. Not financial advice.
Most sensitive to: Expected market return (±10% on this input swings best-plan wealth by ±$190,508).
Cost of fully de-concentrating
All three plans sell to 0% (no hedge).Sensitivity. If your expected position return drops below 19.6%/yr, lump-sum (sell everything today) beats every spread plan above.
Have multiple RSU vest lots? The RSU Lot Order Calculator picks which lots to sell first, and on which dates, to divest at the lowest computed tax.
Build your own plan
Toggle below — chart updates live. Sell buttons show the slice.Tech / Software single names hit a 50%+ peak-to-trough drawdown in roughly 1 of every 5 rolling 3-year windows over 2014–2024. Even mega-caps aren’t exempt.
Tax brackets: 2026 · Estimates only — not financial advice.
Estate note. Heirs receive a stepped-up basis at death (§1014), eliminating built-in gain on inherited shares. Older holders who plan to bequeath rather than sell may rationally never de-concentrate.
You sized one position's risk. The beta integrates hedging, sell-down, and tax timing into one optimized plan.
Request beta access →Related calculators: Protect Your Stock Calculator · RSU Lot Order Calculator · Equity Funding Plan Calculator
About Cerebras Systems
Cerebras Systems (CBRS) is a public Semiconductor company, incorporated in Delaware and headquartered in Sunnyvale, CA. IPO'd May 14, 2026.
Last close: $196.13 per share (as of 2026-08-24).
IPO May 2026; wafer-scale AI compute.
Equity grants at Cerebras Systems typically include incentive stock options (ISOs), non-qualified stock options (NSOs), and restricted stock units (RSUs).
Cerebras Systems Inc., headquartered in Sunnyvale, California, develops semiconductors, supercomputers, and related software to power artificial intelligence deep-learning applications such as inference engines. Products include its wafer scale engine (WSE)-3 semiconductors, its CS-3 supercomputers, and its "AI inference cloud" and "AI training cloud" APIs, which allow users to access the company's computing power without buying its hardware. The company also builds data centers using its processors and supercomputers to provide cloud computing services directly to clients.
Source: Wikipedia (CC BY-SA 4.0)
Cerebras Systems makes the Wafer Scale Engine (WSE), a processor fabricated from an entire 300mm silicon wafer rather than the small dies that conventional chips use. Founded in Sunnyvale in 2016 by Andrew Feldman and four co-founders who had previously sold SeaMicro to AMD for $334 million, the company shipped its first system in August 2019. In January 2026, Cerebras signed a multi-year agreement to supply 750 megawatts of AI compute to OpenAI, a deal valued at over $10 billion. The company reported $510 million in 2025 revenue and listed on Nasdaq under the ticker CBRS in May 2026.
Sources: en.wikipedia.org · cerebras.ai · finance.yahoo.com
Equity comp at Cerebras Systems
- Original S-1 filed September 2024 was paused due to CFIUS review of UAE-based G42's investment (G42 accounted for 83% of 2023 revenue and 97% of 2024 hardware sales). CFIUS clearance reportedly obtained in early 2025 but IPO remained on hold; company raised $1.1B at an $8.1B valuation. Refiled S-1 in April 2026 with G42 removed from the investor list, targeting a May 14, 2026 NASDAQ listing under ticker CBRS. Holders face a concentrated tax-withholding event at IPO (about $230M earmarked for RSU settlement obligations) after roughly 18 months of regulatory uncertainty.
- RSUs use double-trigger vesting. Two things must both happen before the shares are yours: (1) the normal time-based vesting completes, and (2) the company has a liquidity event (an IPO or an acquisition). Until both happen, you do not yet own the shares and you do not owe tax on them.
Sources: sec.gov · techstartups.com
Researched 2026-05-11.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Cerebras Systems.
If a meaningful share of your net worth sits in CBRS, concentration risk is the question. This calculator quantifies drawdown impact at 30 / 50 / 70%, and the trade-off between selling down (tax cost now) versus hedging (option premium drag), auto-filled with CBRS's option-implied volatility.
Example: 5,000 CBRS shares at $196.13 is a $980,650 position. A 30% drawdown costs $294,195; a 50% drawdown costs $490,325; a 70% drawdown costs $686,455. The calculator quantifies the trade-off between selling down (immediate capital-gains tax) and hedging (option premium drag) using CBRS's option-implied volatility and your cost basis.
All Cerebras Systems tools → · Use the generic Stock Concentration Calculator for any company. Diversifying multiple RSU lots? See the lot-by-lot sell order →
Cerebras Systems equity questions
- How much CBRS stock is too much?
- There is no single threshold, but the larger the share of your net worth in one stock, the more a single bad year can set back your plans. The calculator above quantifies the drawdown impact at 30, 50, and 70 percent for your CBRS position and weighs selling down (which triggers capital-gains tax now) against hedging (which costs option premium).
- Does Cerebras Systems grant ISOs, NSOs, or RSUs?
- Equity compensation at Cerebras Systems typically takes the form of incentive stock options (ISOs), non-qualified stock options (NSOs), and restricted stock units (RSUs). Incentive stock options can trigger the alternative minimum tax (AMT) when you exercise. Restricted stock units are taxed as ordinary income when they vest.
- When did the Cerebras Systems IPO lockup expire?
- Cerebras Systems (CBRS) went public on May 14, 2026. The standard post-IPO lockup runs 180 days, so employee and insider shares generally became sellable around November 10, 2026. Confirm against your own grant paperwork, since some lockups release early or in stages.
- Do Cerebras Systems RSUs use double-trigger vesting?
- Yes. Cerebras Systems restricted stock units (RSUs) vest only when two things both happen: the time-based schedule completes, and the company has a liquidity event such as an initial public offering (IPO) or an acquisition. Until both occur you do not own the shares and owe no tax on them.
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