Updated 2026

The SIE Math Filter

Every Formula You Need (and the Ones You Don't)

Don't panic about advanced financial modeling. The SIE tests concepts, not calculus. Here is every formula you actually need — and the ones you can safely skip.

About this guide: Written for the 2026 FINRA Securities Industry Essentials (SIE) Exam. The SIE is not math-heavy — you need roughly 7–8 formulas total. We've tagged each one so you know exactly where to focus. Published by 2DollarTests.
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SIE Exam: Must-Know Math Formulas

9 formulas · These are the ones that actually show up
Current Yield Must Know
Annual Income ÷ Market Price
Use annual dividend or interest. If the question says "quarterly dividend of $0.50," multiply by 4 first → $2.00. Works for both stocks (dividends) and bonds (interest).
💡 The #1 trap: forgetting to annualize. "Quarterly" × 4. "Semiannual" × 2. Always.
Dividend Yield Must Know
Annual Dividend ÷ Stock Price
Same concept as Current Yield, but specific to stocks. The exam uses both terms — don't let the wording confuse you.
Stock Split (Forward) Must Know
New Price = Old ÷ Ratio
New shares = Old shares × Ratio. New price = Old price ÷ Ratio. Total value never changes — you just have more slices of the same pizza.
Example: 3-for-2 split on $60 stock → $60 ÷ 1.5 = $40 new price, 150 shares instead of 100.
Quick Check
You own 100 shares of XYZ at $60. The company announces a 3-for-2 split. What is the new price per share?
$40
$60 ÷ 1.5 (the ratio) = $40. You now have 150 shares at $40. Total value is still $6,000.
P/E Ratio Must Know
Market Price ÷ EPS
Used to value a company. High P/E = growth stock (investors expect future earnings). Low P/E = value stock (cheaper relative to current earnings). You won't need to calculate EPS itself on the SIE — just know this formula.
NAV Per Share Must Know
(Assets − Liabilities) ÷ Shares
The "bid" price of a mutual fund — what you receive when you redeem. Calculated once per day at market close (4 PM ET). All orders execute at the next calculated NAV — this is called forward pricing.
Public Offering Price (POP) Must Know
NAV + Sales Charge ($)
The "ask" price — what you pay to buy mutual fund shares. You buy at POP, redeem at NAV. Max sales charge: 8.5% under FINRA rules.
Pro Tip: If given NAV ($9.15) and SC% (8.5%), use this formula:
POP = NAV ÷ (100% − SC%)
$9.15 ÷ 0.915 = $10.00 POP. This is the "hard" version the exam actually asks.
Sales Charge % Must Know
(POP − NAV) ÷ POP
Divide by POP (the offering price), not by NAV. This is a common trap — the sales charge is calculated as a percentage of what you pay, not what the fund is worth.
Options Breakeven (Call) Must Know
Strike + Premium
"Call Up" → add the premium to the strike price. The stock must rise above this level for the call buyer to profit.
Options Breakeven (Put) Must Know
Strike − Premium
"Put Down" → subtract the premium from the strike price. The stock must fall below this level for the put buyer to profit.
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Common Exam Trap
The two biggest math traps on the SIE: (1) forgetting to annualize quarterly or semiannual payments before calculating yield, and (2) dividing the sales charge by NAV instead of POP. If you remember these two things, you're ahead of most test-takers.
Test Yourself

SIE Math: Current Yield

ABC Corp trades at $50. It pays a quarterly dividend of $0.50. What is the Current Yield?

Correct!

The math: Annualize the dividend first → $0.50 × 4 = $2.00.
Then: $2.00 ÷ $50.00 = 0.04 = 4%.

We have 3,000+ more questions like this.

Not quite

Remember: yield is always based on annual income. Did you forget to multiply the quarterly payment ($0.50) by 4? The annual dividend is $2.00, not $0.50.

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SIE Exam: Formulas You Can Safely Ignore

3 formulas · Save your brainpower for what matters
Debt Service Coverage Ratio Skip
NOI ÷ Debt Service
Overkill. This is a Series 7 / 79 topic. You will not see this calculation on the SIE.
Short Margin Maintenance Skip
Credit Balance ÷ 1.3
Overkill. For the SIE, just know the 50% Reg T initial margin rule and the $2,000 minimum equity requirement. That's it.
Convertible Bond Parity Rare
Bond Price ÷ Conversion Ratio
Good to understand the concept (convertible bonds can be exchanged for stock), but the actual parity calculation is Series 7 territory.

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SIE Exam Math Formula Summary

This guide covers every math formula tested on the FINRA Securities Industry Essentials (SIE) Exam, updated for 2026. Must-know formulas include: Current Yield (Annual Income divided by Market Price), Dividend Yield (Annual Dividend divided by Stock Price), Stock Split calculation (New Price equals Old Price divided by split ratio), P/E Ratio (Market Price divided by Earnings Per Share), NAV per share (Assets minus Liabilities divided by Shares Outstanding), Public Offering Price or POP (NAV plus Sales Charge in dollars, or NAV divided by 1 minus Sales Charge Percentage when given a percentage), Sales Charge Percentage (POP minus NAV divided by POP — divide by POP not NAV), and Options Breakeven (Call Up means Strike plus Premium, Put Down means Strike minus Premium). Formulas you can safely ignore for the SIE include Debt Service Coverage Ratio, Short Margin Maintenance, and Convertible Bond Parity. The two biggest exam traps are forgetting to annualize quarterly or semiannual payments and dividing sales charge by NAV instead of POP. Published by 2DollarTests.

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