Free course · Module 4
Spinoffs and Mergers
A company deal can leave you with two stocks, cash, replacement shares or a mixture. Learn to read the terms and dates, track fractional shares and preserve the records behind your cost basis.
Written by the StockEducation Editorial Team · Reviewed by Associate Professor Charles Lo, CPA, PhD · Updated 19 Oct 2026 · How we check lessons
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Idea 1 of 4
A spinoff changes what you own.
A spinoff distributes shares in a separated business to the parent’s shareholders. You generally keep the parent shares and receive the new company’s shares at the stated ratio. The businesses and their market prices change; receiving another stock is not free extra wealth.
GE’s April 2, 2024 GE Vernova distribution used one GEV share for every four GE shares. In the historical example below, 100 GE shares become a holding of 100 GE shares plus 25 GEV shares. GE continued as GE Aerospace under the GE ticker. Source 1.
One parent-company holding
GE Aerospace shares
100 ÷ 4 = 25 shares
The share count alone does not tell you the combined market value or future return.
Dates, due bills and fractional shares
Read the distribution ratio and the entitlement rules together.
Idea 2 of 4
Allocate the existing cost basis.
A qualifying tax-free distribution generally reallocates existing basis between the holdings. It does not make the new shares’ basis automatically zero. GE’s Form 8937 attachment illustrates an allocation using relative fair market values, with roughly 79.74% staying with GE and 20.26% going to GEV. It expressly permits other reasonable valuation approaches in consultation with a tax adviser. Source 2.
The company’s own illustration starts with 1,200 GE shares and a $12,000 basis. Its unrounded price-based weights produce the allocations below, rounded to cents. The total basis remains $12,000.
300 GEV shares distributed at 1 for 4
Approximately 79.74%
Approximately 20.26%
Keep the issuer’s document and the calculation with your records.
What does Form 8937 establish?
Do spinoffs automatically outperform?
Keep the basis total intact and distinguish a historical example from your own tax position.
Idea 3 of 4
Merger terms decide what you receive.
A merger’s consideration is the cash, shares or combination holders are entitled to receive under its terms. A fixed exchange ratio sets a quantity of buyer shares, not their future value. Elections, adjustments, fractional treatment and excluded holdings can change the result.
Read the proxy, information statement or proxy/prospectus and later closing notices. Shareholder approval, financing and regulatory conditions can matter before a deal closes. An announced offer is not already cash in your account. Source 4.
100 × $50
100 × 0.5 · buyer shares
25 shares
Cash plus buyer shares
Cash, a share quantity and a mixed payment are not the same settlement.
A real cash deal: Microsoft and Activision
Tender offers, elections and deadlines
Terms, conditions and effective dates determine the settlement.
Idea 4 of 4
Keep the shares and basis reconciled.
Reproduce the GE illustration, then try a fractional entitlement. This practice model uses the company’s opening-price method and one original lot. The 1-for-4 entitlement is split into whole shares and a fraction assumed sold by the agent. It calculates basis only, not cash proceeds or tax due.
Reconcile shares and cost basis
Historical method · practice inputsUse 1 to 1,000,000 whole GE shares and a total basis from $0 to $1,000,000,000 with no more than two decimal places.
Fractional-sale cash is not calculated. Obtain the agent’s actual proceeds and any costs separately.
GE weight = (shares × $140.53) ÷ combined hypothetical fair market value; GEV uses one-quarter as many shares at $142.85. The prices are the issuer’s April 2, 2024 illustration. The model keeps full weights, rounds allocations to cents and assigns rounding differences so the displayed amounts reconcile. One lot only; other valid methods or tax treatments may apply.
Try three checks
- Choose the company example. Confirm 300 GEV shares and the $9,568.41 / $2,431.59 allocation in Form 8937.
- Choose 102 shares. Explain why the 25.5-share entitlement becomes 25 retained whole shares plus cash for the half share, and why part of the GEV basis belongs to that half.
- Keep the issuer’s document, your original lots, the broker’s allocation and the fractional-sale statement together. Write what would still be missing from an actual tax calculation.
Why a merger spread is not free profit
Reconcile the records before interpreting a deal as a gain.
Quick check
Three quick checks. Feedback straight away.
You own 100 eligible parent shares and the distribution is 1 new share for every 4 held. What do you own after this simplified spinoff?
Choose an answer to see the explanation.
In a simplified qualifying distribution, your $5,000 basis is allocated 80% to the parent and 20% to the new shares. What basis goes to the new shares?
Choose an answer to see the explanation.
What does a target’s price below a conditional cash offer establish?
Choose an answer to see the explanation.
Review your takeaway card and the learning path
- Spinoffs separate holdings. Keep the parent shares and follow the distribution ratio.
- Basis needs records. Allocate it under the applicable rules and preserve each lot.
- Merger terms differ. Cash, stock and mixed consideration need different checks.
- Fractions and risk matter. Separate cash proceeds from basis and do not treat a deal spread as guaranteed profit.
Reading markers and these practice checks stay on this device. They do not mark the LMS lesson complete.
Sources and assumptions
- GE: February 29, 2024 spinoff announcement, SEC Exhibit 99.1. Record/distribution dates, one-for-four ratio, retained GE shares and trading-entitlement arrangements.
- GE: Form 8937 attachment, 2024 distribution. Illustrative relative-value method, alternative reasonable approaches, lot records, opening prices and the 1,200-share basis example.
- GE Vernova: March 2024 Form 10 information statement. Fractional-share aggregation/sale and cash, distribution terms and qualified U.S. tax discussion; see the spinoff Q&A and tax section.
- Investor.gov: Mergers. Consideration, shareholder information, approval and documents.
- Activision Blizzard: October 13, 2023 Form 8-K. Completed Microsoft transaction, eligible common shares converted into the right to $95 cash and Nasdaq halt/delisting requests.
- Investor.gov: Tender Offer. Limited offer period, shareholder decision and possible conditions.
- Investor.gov: Mini-Tender Offers. Below-market pricing and differences in disclosure/withdrawal protections.
- Cusatis, Miles and Woolridge: Restructuring through spinoffs (1993). Journal of Financial Economics 33(3), 293 to 311. Historical sample and takeover-related abnormal performance; Penn State publication record and abstract.
Sources checked 19 October 2026. The 2023/2024 deals and prices are historical examples. Practice allocations are simplified, not individual tax calculations or investment recommendations. Local reading and quiz controls do not mark an LMS lesson complete.
StockEducation provides general education, not personal financial, tax or legal advice. Nothing here recommends a specific security. Investing involves risk, including loss of money you invest.
