FireFly Robotics, Inc. Files S-1: RSU & Capital Gains Tax Exposure Calculator (Oct 7, 2026)

What Changed

FireFly Robotics filed its S-1 on October 7, 2026, a 34 MB registration statement marking its intent to go public. The filing opens a pre-IPO window of roughly 90 to 120 days before shares price, the standard interval between S-1 submission and first trade. For employees holding pre-IPO equity, this clock determines when restricted stock units convert to taxable, sellable shares.

The Numbers That Matter

Event	Typical Timing	Tax Trigger	Liquidity Status
S-1 filed	Day 0 (Oct 7, 2026)	None	Shares illiquid
SEC review and amendments	Day 30 to 75	None	Shares illiquid
Pricing and IPO	Day 90 to 120	Vesting RSUs taxed at ordinary rate	Shares list on exchange
Lockup expiration	Day 180 post-IPO	Capital gains clock starts on any post-IPO price movement	Shares sellable

The 180-day lockup period deserves attention. It is not a formality but the actual date when capital becomes available, often 6 months after the headline IPO pop.

Tax Liability and Liquidity Timeline

For a holder with $1.5M in pre-IPO FireFly RSUs at a 37% federal marginal rate plus 13.3% California state tax, vesting at IPO pricing creates an estimated $754,500 combined tax liability, assuming no 83(b) election was filed pre-vest. That liability is due regardless of whether shares can be sold, since the 180-day lockup prevents liquidation at the moment the tax bill is assessed.

Scenario Analysis

Position Size	Est. Tax Due at Vest (50.3% combined)	Shares Sellable at Lockup Expiry	Cash Needed Before Liquidity
$500K RSU value	$251,500	Day 180 post-IPO	$251,500
$1.5M RSU value	$754,500	Day 180 post-IPO	$754,500
$3M RSU value	$1,509,000	Day 180 post-IPO	$1,509,000

At every position size, the tax bill lands before the shares are legally sellable. This timing gap is the core planning consideration.

Frequently Asked Questions

Q: When does FireFly Robotics stock become taxable after the S-1 filing? A: Taxation typically hits at vesting, which lands at IPO pricing, roughly 90 to 120 days after the October 7, 2026 S-1 filing.

Q: Can FireFly Robotics employees sell shares immediately after the IPO prices? A: No, standard lockup agreements block sales for 180 days after the IPO date, even though the tax liability is assessed earlier.

Q: How much cash should a $1.5M RSU holder set aside for taxes? A: Approximately $754,500 at a combined 50.3% federal and California marginal rate, due before shares are sellable under the lockup.

Q: Does an S-1 filing guarantee the IPO will complete? A: No, S-1 filings can be withdrawn or delayed, so the 90 to 120 day pricing window is an estimate, not a commitment.

Run the Numbers

Use CalcMoney's Calculate Your After-Tax RSU Proceeds to see your exact figures under the current tax threshold.

Disclaimer: This article is for informational purposes only and does not constitute professional financial, tax, or legal advice. Consult a qualified tax advisor or financial professional regarding your specific situation.

Run the Numbers: Capital Gains Tax Terminal on CalcMoney — see your exact figures under current market conditions.

Data sourced from SEC EDGAR S-1 Filings (IPO). Rates and thresholds are for informational purposes only. Consult a licensed financial advisor before making mortgage, investment, or tax decisions.

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