How does a collar strategy work and when would a portfolio manager use one?

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AcadiFi · Accepted Answer

A collar is one of the most practical risk management strategies tested on CFA Level III. It provides **downside protection while capping upside** — and can be structured at zero or near-zero cost. It is especially useful for executives with concentrated stock positions. ```mermaid graph TD subgraph Collar Construction LS[Long Stock
Current Price: $85] --> LP[Buy Put
Strike K1 = $75
Premium: -$3.50] LS --> SC[Sell Call
Strike K2 = $100
Premium: +$3.20] end subgraph Payoff Zones Z1[ST < $75
Put exercised
Floor at $75
Loss capped at -$10] --> Z2[ST $75-$100
Both expire OTM
Full participation
in stock movement] Z2 --> Z3[ST > $100
Call exercised against you
Ceiling at $100
Gain capped at +$15] end LP --> |Net cost: $0.30| NC[Near Zero-Cost Collar] style Z1 fill:#7f1d1d,color:#fff style Z2 fill:#2d6a4f,color:#fff style Z3 fill:#1e3a5f,color:#fff ``` **Worked Example — Protecting a Concentrated Position:** Diana Park is the CFO of Westbrook Technologies. She holds 50,000 shares at $85 each ($4.25M total). She is restricted from selling for 12 months but is concerned about downside risk. She implements a collar: | Component | Detail | |---|---| | Long stock | 50,000 shares at $85 | | Buy 12-month put | K = $75, premium = $3.50/share | | Sell 12-month call | K = $100, premium = $3.20/share | | **Net premium** | **$0.30/share cost** ($15,000 total) | **Payoff Analysis at Expiration:** | Stock Price | Stock Gain/Loss | Put Payoff | Call Payoff | Net Position Value | Net Profit | |---|---|---|---|---|---| | $60 | -$25 | +$15 | $0 | $75 - $0.30 = $74.70 | -$10.30/share | | $70 | -$15 | +$5 | $0 | $75 - $0.30 = $74.70 | -$10.30/share | | $75 | -$10 | $0 | $0 | $75 - $0.30 = $74.70 | -$10.30/share | | $85 | $0 | $0 | $0 | $85 - $0.30 = $84.70 | -$0.30/share | | $95 | +$10 | $0 | $0 | $95 - $0.30 = $94.70 | +$9.70/share | | $100 | +$15 | $0 | $0 | $100 - $0.30 = $99.70 | +$14.70/share | | $120 | +$35 | $0 | -$20 | $100 - $0.30 = $99.70 | +$14.70/share | **Key Metrics:** - **Maximum loss:** $85 - $75 + $0.30 = **$10.30/share** (occurs at any price <= $75) - **Maximum gain:** $100 - $85 - $0.30 = **$14.70/share** (occurs at any price >= $100) - **Breakeven:** $85 + $0.30 = **$85.30** **When to Use a Collar:** 1. **Concentrated stock positions:** Executives, founders, or employees with large holdings who cannot or prefer not to sell. 2. **Zero-cost structure:** By choosing put and call strikes where premiums roughly offset, the protection costs almost nothing — the "price" is forgoing upside above the call strike. 3. **Tax deferral:** Unlike selling the stock, a collar does not trigger a taxable event (generally, though tax rules vary). 4. **Estate planning:** Locks in a value range for wealth transfer purposes. **Collar vs. Other Protective Strategies:** | Strategy | Downside Protection | Upside | Cost | Complexity | |---|---|---|---|---| | Protective put only | Full below strike | Unlimited | High premium | Low | | Collar | Full below put strike | Capped at call strike | Near zero | Medium | | Prepaid forward | Full | None (sold all upside) | Receives cash upfront | High | | Short stock + call | Partial (synthetic put) | Capped | Premium from call sale | Medium | **Exam Tip:** Level III constructed response questions love to present a client with a concentrated position and ask you to recommend and justify a risk management strategy. The collar is often the best answer because it balances protection, cost, and tax efficiency. Always state the trade-off: you sacrifice upside beyond the call strike. Master derivatives risk management with our CFA Level III practice questions.

How does a collar strategy work and when would a portfolio manager use one?

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