Convertible Preferred: Advanced Concepts
You learned the basics of convertible preferred in the types section. Now let's cover the advanced concepts the exam tests: anti-dilution adjustments and sinking fund provisions.
Anti-Dilution Agreement (Covenant)
Virtually all convertible preferred stock is issued with an anti-dilution covenant that protects holders from dilution caused by stock splits and stock dividends.
- When a stock split or stock dividend occurs, the conversion ratio is adjusted proportionally
- Without anti-dilution protection, a 2-for-1 split would halve the value of the conversion feature
- The anti-dilution adjustment protects the holder, not the issuer
How the Adjustment Works
After a stock split:
- The conversion ratio increases (more shares received)
- The conversion price decreases (lower price per share)
- The conversion value stays the same before and after the split
Worked Example
Original terms: $100 par, conversion price $50, conversion ratio = 2 shares
After a 2-for-1 stock split:
- New conversion price: $50 / 2 = $25
- New conversion ratio: $100 / $25 = 4 shares (or simply 2 x 2 = 4)
- If common was at $50 pre-split and $25 post-split:
- Pre-split conversion value: 2 x $50 = $100
- Post-split conversion value: 4 x $25 = $100
- Conversion value is unchanged - the holder is protected
Another Example: 3-for-1 Split
Original: $100 par, conversion price $30, conversion ratio = 3.33 shares
After 3-for-1 split:
- New conversion price: $30 / 3 = $10
- New conversion ratio: $100 / $10 = 10 shares
Exam Tip: Gotchas
- Anti-dilution adjustments protect the HOLDER, not the issuer.
- After a stock split, the conversion ratio increases and the conversion price decreases proportionally.
- The exam may give you a pre-split conversion ratio and ask for the post-split ratio; just multiply the ratio by the split factor.
Sinking Fund Provisions
Some preferred stock issues include a sinking fund requiring the issuer to retire a portion of outstanding shares each year.
- The issuer sets aside money periodically to repurchase shares on the open market or call them at a specified price
- Sinking funds reduce risk for the investor by ensuring the issuer systematically retires the obligation
- Works the same way as sinking funds on bonds
How Sinking Funds Affect the Investor
| Factor | Impact |
|---|---|
| Credit risk | Reduced (issuer is gradually retiring the obligation) |
| Liquidity | Reduced (fewer shares outstanding over time) |
| Call risk | Increased (issuer may call specific shares for the sinking fund) |
| Price stability | Improved (regular repurchases provide price support) |
Key point: A sinking fund is generally investor-friendly because it forces the issuer to commit funds to retire the preferred shares, reducing the risk that the issuer cannot meet its obligations.
Exam Tip: Gotchas
- Sinking funds reduce credit risk for the investor but introduce some call risk on individual shares.
- A sinking fund on preferred stock works the same way as on bonds; the exam may test this comparison.