Early Assignment of Covered Calls Position in IBM Corporation

I was notified this morning that the two IBM Corporation May 17th, 2024 Call options were exercised yesterday.  Because the IBM stock price increased from $165.23 when this position was established to $169.90 at yesterday's market close, the original $1.44 time value in the Calls when the position was established had declined on yesterday's market close to $0.00, so the owner of these IBM Calls exercised their option to buy the 200 shares at the $162.50 strike price in order to receive today's $1.67 per share ex-dividend.  The +40.6% annualized-return-on-investment (aroi) achieved by early assignment is slightly less than the +44.0% aroi that might have been achieved if this position was instead assigned on its May 17th options expiration date.   

The post when this IBM Corporation Covered Calls position was originally established is here.  As detailed below, the return-on-investment result for this IBM Covered Calls position was +0.9% absolute return in 8 days (equivalent to a +40.6% annualized return-on-investment).

IBM Corporation (IBM) -- Covered Calls Position Closed by Early Assignment
The buy/write transaction was:
5/1/2024 Bought 200 IBM shares @ $165.23
5/1/2024 Sold 2 IBM 5/17/2024 $162.50 Call options @ $4.17.  The Implied Volatility of the Calls was 17.4 when this transaction occurred.
5/9/2024 Two IBM Calls were exercised on the day prior to the May 9th, 2024 ex-dividend date, so the Calls expired and the 200 IBM shares were sold at the $162.50 strike price.

The overall performance results (including commissions) for this IBM Covered Calls position are as follows:
Covered Calls Net Investment: $32,213.34
= ($165.23 - $4.17) * 200 shares + $1.34 commission

Net Profit Components:
(a) Options Income: +$832.66
= ($4.17 * 200 shares) - $1.34 commission
(b) Dividend Income (Call options exercised early on May 8th, the last business day prior to the May 9th ex-div date): +$0.00
(c) Capital Appreciation: -$546.00
+($162.50 strike price - $165.23 stock purchase price) * 200 shares

Total Net Profit (2 IBM Call options exercised early): +$286.66

= (+$832.66 options income +$0.00 dividend income -$546.00 capital appreciation)

Absolute Return-on-Investment: +0.9%

= +$286.66/$32,213.34

Annualized Return-on-Investment: +40.6%

= (+$286.66/$32,213.34) * (365/8 days)