WHY does it exist? A company wants cash without diluting owners' control. Debt does exactly that: lenders get interest but no vote and no share of profits beyond the fixed coupon.
WHAT you're owed as a holder:
Periodic coupon payments (e.g. 8% of face value per year)
Face value (par) returned at maturity
A priority claim: if the company is liquidated, debt holders are paid before equity shareholders.
For the company: it can borrow at a lower coupon than a plain bond, because it hands the investor a bonus — the upside option. Cheaper interest = attractive.
For the investor: downside protection of a bond (you still get coupons + principal if the stock stays flat) plus equity upside if the stock soars.
A convertible is worth at least the greater of two things, because the holder chooses whichever is better:
Convertible value≥max(straight bond valueB,conversion valueP)
Deriving the conversion value P. If I convert, I receive (conversion ratio) shares, each worth the current market price S:
P=(Conversion ratio)×S
Why this step? Because conversion literally exchanges one bond for that many shares, and each share trades at S. That's just counting what you'd hold after converting.
Deriving the straight bond value B. Ignore the option; treat it as a normal bond. Discount every cash flow at the market yield y:
B=∑t=1N(1+y)tC+(1+y)NF
Why this step? A rupee next year is worth less than a rupee today, so each future coupon C and the final face value F is divided by (1+y)t — the time value of money. This is the pure "loan" worth, the floor the convertible can't fall below (assuming no default).
Why max and not sum? You can't both keep the bond AND own the shares — conversion is a swap. You pick the higher-value branch, so the guaranteed worth is the maximum. The market price sits a bit above this max because the option to wait and choose later has extra value.
Imagine you lend your friend ₹100 to open a lemonade stand. A debenture is a note that says "I'll pay you ₹8 every year and give your ₹100 back in 3 years" — a simple loan. A convertible bond is a special note: "same deal, BUT if the lemonade stand becomes super popular, you can swap your loan for a share of the stand instead of getting your ₹100 back." If the stand booms, you take the shares and get rich; if it stays small, you just take your money back. You choose the better outcome — that choice is why it's valuable, and why your friend pays you a bit less interest for it.
Dekho, jab kisi company ko paisa chahiye, to do raaste hain: ya to apni ownership bech do (shares), ya phir udhaar lo (debt). Debenture ek simple udhaar ka kaagaz hai — company kehti hai "mujhe paisa do, main har saal fixed interest (coupon) dunga aur maturity pe tumhara principal wapas kar dunga." Zyadatar debentures unsecured hote hain, matlab koi asset gaadi nahi rakhi jaati, sirf company ki reputation pe bharosa hota hai. Isiliye risk thoda zyada hota hai aur coupon bhi thoda higher hota hai.
Convertible bond ek smart hybrid hai — yeh bhi ek bond hai, par isme ek bonus milta hai: agli baar stock upar chala gaya to tum apne bond ko shares me convert kar sakte ho. Yani agar company boom kar gayi, tum shares le lo aur profit kamao; agar stock flat raha, to tum simple bond ki tarah coupon aur principal le lo. Yeh choice hi iski asli value hai. Isiliye company convertible pe kam coupon deti hai — kyunki woh tumhe upside ka option de rahi hai, aur no free lunch, uske badle interest kam.
Value samajhna easy hai. Do numbers yaad rakho: conversion valueP=ratio×S (kitne shares × unki price), aur bond floorB (agar option ignore karo to normal bond ki value). Convertible ki keemat hamesha in dono me se bade wale ke aas-paas rehti hai — thodi upar, kyunki intezaar karne ka option bhi valuable hai. Jab stock high ho to convert karo, jab low ho to bond hold karke apna paisa safe rakho. Bas yahi core idea hai — bond ka floor tumhe girne se bachata hai, aur conversion tumhe upar ka fayda deta hai.
