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Debt
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Debt
5. Debt
Senior Convertible Notes
The carrying amounts of our senior convertible notes were as follows as of the dates indicated:
(In millions)September 30, 2023December 31, 2022
Principal amount:
Senior Convertible Notes due 2023$124.3 $774.8 
Senior Convertible Notes due 20251,207.5 1,207.5 
Senior Convertible Notes due 20281,250.0 — 
Total principal amount2,581.8 1,982.3 
Unamortized debt issuance costs(25.2)(12.0)
Carrying amount of senior convertible notes$2,556.6 $1,970.3 
For our senior convertible notes for which the if-converted value exceeded the principal amount, the amount in excess of principal was as follows as of the dates indicated:
(In millions)September 30, 2023December 31, 2022
Senior Convertible Notes due 2023$158.1 $1,361.5 
Senior Convertible Notes due 2025— 33.6
Senior Convertible Notes due 2028— — 
Total by which the notes’ if-converted value exceeds their principal amount
$158.1 $1,395.1 
The following table summarizes the components of interest expense and the effective interest rates for each of our senior convertible notes for the periods shown:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2023202220232022
Cash interest expense:
Contractual coupon interest (1)
$1.8 $2.3 $7.0 $6.7 
Non-cash interest expense:
Amortization of debt issuance costs2.0 1.4 5.5 4.3 
Total interest expense recognized on senior notes$3.8 $3.7 $12.5 $11.0 
Effective interest rate:
Senior Convertible Notes due 20231.1 %1.1 %1.1 %1.1 %
Senior Convertible Notes due 20250.5 %0.5 %0.5 %0.5 %
Senior Convertible Notes due 20280.7 %*0.7 %*
(1) Interest on the 2023 Notes began accruing upon issuance and is payable semi-annually on June 1 and December 1 of each year. Interest on the 2025 Notes began accruing upon issuance and is payable semi-annually on May 15 and November 15 of each year. Interest on the 2028 Notes began accruing upon issuance and is payable semi-annually on May 15 and November 15 of each year.
* Not applicable as no notes were outstanding at this date.
0.75% Senior Convertible Notes due 2023
In November 2018, we completed an offering of $850.0 million aggregate principal amount of unsecured senior convertible notes with a stated interest rate of 0.75% and a maturity date of December 1, 2023 (the “2023 Notes”). The net proceeds from the offering, after deducting initial purchasers’ discounts and costs directly related to the offering, were approximately $836.6 million. The initial conversion rate of the 2023 Notes is 24.3476 shares per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $41.07 per share, subject to adjustments. We entered into transactions for a convertible note hedge (the “2023 Note Hedge”) and
warrants (the “2023 Warrants”) concurrently with the issuance of the 2023 Notes. The 2023 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. We use the if-converted method for assumed conversion of the 2023 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share.
No principal payments are due on the 2023 Notes prior to maturity. Other than restrictions relating to certain fundamental changes and consolidations, mergers or asset sales and customary anti-dilution adjustments, the indenture relating to the 2023 Notes includes customary terms and covenants, including certain events of default after which the 2023 Notes may be due and payable immediately.
For the twelve months ended December 31, 2022, holders of $17.5 million in aggregate principal amount of the 2023 Notes elected conversion at their option. We settled these conversions using treasury stock. We issued 425,552 shares to settle the converted 2023 Notes. We received 287,492 shares of common stock from the exercise of a portion of the 2023 Note Hedge that we purchased concurrently with the issuance of the 2023 Notes, as described below.
For the three and nine months ended September 30, 2023, we settled $650.5 million in aggregate principal amount of the 2023 Notes through a combination of $650.5 million in cash for the principal amount and 10,599,907 shares of common stock for the amount in excess of the principal amount. We received 10,585,850 shares of common stock from the exercise of a portion of the 2023 Note Hedge that we purchased concurrently with the issuance of the 2023 Notes, as described below.
The remaining outstanding principal of $124.3 million as of September 30, 2023 and any amount in excess of the principal amount will settle on or before the maturity date of December 1, 2023.
Conversion Rights at the Option of the Holders
Holders of the 2023 Notes have the right to require us to repurchase for cash all or a portion of their notes at 100% of their principal amount, plus any accrued and unpaid interest, upon the occurrence of a fundamental change (as defined in the indenture relating to the notes). We will also be required to increase the conversion rate for holders who convert their 2023 Notes in connection with certain fundamental changes occurring prior to the maturity date or following the delivery by Dexcom of a notice of redemption.
Holders of the 2023 Notes had the ability to convert all or a portion of their notes at their option prior to 5:00 p.m., New York City time, on the business day immediately preceding September 1, 2023, in multiples of $1,000 principal amount, only under the following circumstances:
(1)during any calendar quarter commencing after March 31, 2019 (and only during such calendar quarter), if the last reported sale price of Dexcom’s common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable conversion price of the 2023 Notes on each such trading day;
(2)during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2023 Notes for each day of that five-day consecutive trading day period was less than 98% of the product of the last reported sale price of Dexcom’s common stock and the applicable conversion rate of the 2023 Notes on such trading day;
(3)if we call any or all of the 2023 Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or
(4)upon the occurrence of specified corporate transactions.
Circumstance (1) listed above occurred during the quarters ended December 31, 2022, March 31, 2023, and June 30, 2023. As a result, the 2023 Notes were convertible at the option of the holder from January 1, 2023 through August 31, 2023.
On or after September 1, 2023, until 5:00 p.m., New York City time, on the second scheduled trading day immediately preceding the maturity date, holders of the 2023 Notes may convert all or a portion of their notes regardless of the foregoing circumstances. See above for a description of conversion activity related to the 2023 Notes.
Conversion Rights at Our Option
Dexcom did not have a right to redeem the 2023 Notes prior to December 1, 2021. On or after December 1, 2021 and prior to September 1, 2023, Dexcom was permitted to redeem for cash all or part of the 2023 Notes, at its option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in
effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which Dexcom provides notice of redemption. The redemption price was equal to 100% of the principal amount of the 2023 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.
2023 Note Hedge
In connection with the offering of the 2023 Notes, in November 2018 we entered into convertible note hedge transactions with two of the initial purchasers of the 2023 Notes (the “2023 Counterparties”) entitling us to purchase up to 20.7 million shares of our common stock at an initial price of $41.07 per share, each of which is subject to adjustment. The cost of the 2023 Note Hedge was $218.9 million and we accounted for it as an equity instrument by recognizing $218.9 million in additional paid-in capital during 2018. The 2023 Note Hedge will expire on December 1, 2023. The 2023 Note Hedge is expected to reduce the potential equity dilution upon any conversion of the 2023 Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted 2023 Notes if the daily volume-weighted average price per share of our common stock exceeds the strike price of the 2023 Note Hedge. The strike price of the 2023 Note Hedge initially corresponds to the conversion price of the 2023 Notes and is subject to certain adjustments under the terms of the 2023 Note Hedge. An assumed exercise of the 2023 Note Hedge by us is considered anti-dilutive since the effect of the inclusion would always be anti-dilutive with respect to the calculation of diluted earnings per share. See above for a description of conversion activity related to the 2023 Notes and shares received as the result of exercising a portion of the 2023 Note Hedge.
2023 Warrants
In November 2018, we also sold warrants to the 2023 Counterparties to acquire up to 20.7 million shares of our common stock. The 2023 Warrants require net share settlement and a pro rated number of warrants will expire on each of the 60 scheduled trading days starting on March 1, 2024. We received $183.8 million in cash proceeds from the sale of the 2023 Warrants, which we recorded in additional paid-in capital during 2018. The 2023 Warrants could have a dilutive effect on our earnings per share to the extent that the price of our common stock during a given measurement period exceeds the strike price of the 2023 Warrants. The strike price of the 2023 Warrants is initially $49.60 per share and is subject to certain adjustments under the terms of the warrant agreements. We use the treasury share method for assumed conversion of the 2023 Warrants when computing the weighted average common shares outstanding for diluted earnings per share.
0.25% Senior Convertible Notes due 2025
In May 2020, we completed an offering of $1.21 billion aggregate principal amount of unsecured senior convertible notes with a stated interest rate of 0.25% and a maturity date of November 15, 2025 (the “2025 Notes”). The net proceeds from the offering, after deducting initial purchasers’ discounts and estimated costs directly related to the offering, were approximately $1.19 billion. The initial conversion rate of the 2025 Notes is 6.6620 shares per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $150.11 per share, subject to adjustments. The 2025 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. We use the if-converted method for assumed conversion of the 2025 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share.
No principal payments are due on the 2025 Notes prior to maturity. Other than restrictions relating to certain fundamental changes and consolidations, mergers or asset sales and customary anti-dilution adjustments, the indenture relating to the 2025 Notes includes customary terms and covenants, including certain events of default after which the 2025 Notes may be due and payable immediately.
Conversion Rights at the Option of the Holders
In the event of a fundamental change (as defined in the indenture related to the 2025 Notes), holders of the 2025 Notes have the right to require us to repurchase for cash all or a portion of their notes at a price equal to 100% of the principal amount of the 2025 Notes, plus any accrued and unpaid interest. Holders of the 2025 Notes who convert their notes in connection with a make-whole fundamental change (as defined in the indenture) or following the delivery by Dexcom of a notice of redemption are, under certain circumstances, entitled to an increase in the conversion rate.
Prior to 5:00 p.m., New York City time, on the business day immediately preceding August 15, 2025, holders of the 2025 Notes may convert all or a portion of their notes, in multiples of $1,000 principal amount, only under the following circumstances:
(1)during any calendar quarter commencing after September 30, 2020 (and only during such calendar quarter), if the last reported sale price of Dexcom’s common stock for at least 20 trading days (whether or
not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable conversion price of the Notes on each such trading day;
(2)during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Notes for each day of that five day consecutive trading day period was less than 98% of the product of the last reported sale price of Dexcom’s common stock and the applicable conversion rate of the Notes on such trading day;
(3)if we call any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or
(4)upon the occurrence of specified corporate transactions.
 On or after August 15, 2025, until 5:00 p.m., New York City time, on the business day immediately preceding the maturity date, holders of the 2025 Notes may convert all or a portion of their notes regardless of the foregoing circumstances.
Conversion Rights at Our Option
Dexcom was not permitted to redeem the 2025 Notes prior to May 20, 2023. On or after May 20, 2023 and prior to August 15, 2025, Dexcom may redeem for cash all or part of the 2025 Notes, at its option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which Dexcom provides notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2025 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.
0.375% Senior Convertible Notes due 2028
In May 2023, we completed an offering of $1.25 billion aggregate principal amount of unsecured senior convertible notes with a stated interest rate of 0.375% and a maturity date of May 15, 2028 (the “2028 Notes”). The net proceeds from the offering, after deducting initial purchasers’ discounts and estimated costs directly related to the offering, were approximately $1.23 billion. The initial conversion rate of the 2028 Notes is 6.1571 shares per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $162.41 per share, subject to adjustments. The 2028 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. We use the if-converted method for assumed conversion of the 2028 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share.
No principal payments are due on the 2028 Notes prior to maturity. Other than restrictions relating to certain fundamental changes and consolidations, mergers or asset sales and customary anti-dilution adjustments, the indenture relating to the 2028 Notes includes customary terms and covenants, including certain events of default after which the 2028 Notes may be due and payable immediately.
Conversion Rights at the Option of the Holders
In the event of a fundamental change (as defined in the indenture related to the 2028 Notes), holders of the 2028 Notes have the right to require us to repurchase for cash all or a portion of their notes at a price equal to 100% of the principal amount of the 2028 Notes, plus any accrued and unpaid interest. Holders of the 2028 Notes who convert their notes in connection with a make-whole fundamental change (as defined in the indenture) or following the delivery by Dexcom of a notice of redemption are, under certain circumstances, entitled to an increase in the conversion rate.
Prior to 5:00 p.m., New York City time, on the business day immediately preceding February 15, 2028, holders of the 2028 Notes may convert all or a portion of their notes, in multiples of $1,000 principal amount, only under the following circumstances:
(1)during any calendar quarter commencing after September 30, 2023 (and only during such calendar quarter), if the last reported sale price of Dexcom’s common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable conversion price of the Notes on each such trading day;
(2)during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Notes for each day of that five day consecutive trading day period was less than 98% of the product of the last reported sale price of Dexcom’s common stock and the applicable conversion rate of the Notes on such trading day;
(3)if we call any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or
(4)upon the occurrence of specified corporate transactions.
On or after February 15, 2028, until 5:00 p.m., New York City time, on the second scheduled trading day immediately preceding the maturity date, holders of the 2028 Notes may convert all or a portion of their notes regardless of the foregoing circumstances.
Conversion Rights at Our Option
Dexcom may not redeem the 2028 Notes prior to May 20, 2026. On or after May 20, 2026 and prior to February 15, 2028, Dexcom may redeem for cash all or part of the 2028 Notes, at its option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which Dexcom provides notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2028 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.
2028 Capped Call Transactions
In May 2023, in connection with the offering of the 2028 Notes, we entered into privately negotiated capped call transactions (the “2028 Capped Calls”) with certain financial institutions. The 2028 Capped Calls will cover, subject to anti-dilution adjustments substantially similar to those applicable to the 2028 Notes, the number of shares of our common stock that will initially underlie the 2028 Notes. The 2028 Capped Calls are expected generally to reduce potential dilution to our common stock upon conversion of the 2028 Notes and/or offset any cash payments that we are required to make in excess of the principal amount of converted 2028 Notes, as the case may be, with such reduction and/or offset subject to a cap. The 2028 Capped Calls have an initial cap price of $212.62 per share, subject to adjustments, which represents a premium of 80% over the closing price of our common stock of $118.12 per share on the Nasdaq Global Select Market on May 2, 2023. The cost to purchase the 2028 Capped Calls of $101.3 million was recorded as a reduction to additional paid-in capital in our consolidated balance sheets as the 2028 Capped Calls met the criteria for classification in stockholders’ equity.
Revolving Credit Agreement
Terms of the Revolving Credit Agreement
In June 2023, we entered into the First Amendment to the Second Amended and Restated Credit Agreement (the "Amended Credit Agreement"), which we had previously entered into in October 2021. The Amended Credit Agreement is a five-year revolving credit facility, that provides for an available principal amount of $200.0 million which can be increased up to $500.0 million at our option subject to customary conditions and approval of our lenders (the “Credit Facility”). The Amended Credit Agreement will mature on October 13, 2026. Borrowings under the Amended Credit Agreement are available for general corporate purposes, including working capital and capital expenditures.
Information related to availability and outstanding borrowings on our Amended Credit Agreement is as follows as of the date indicated:
(In millions)September 30, 2023
Available principal amount 200.0 
Letters of credit sub-facility25.0 
Outstanding borrowings — 
Outstanding letters of credit7.3 
Total available balance$192.7 
Revolving loans under the Amended Credit Agreement bear interest at our choice of one of three base rates plus a range of applicable rates that are based on our leverage ratio. The first base rate is the Alternate Base Rate (“ABR”) and loans comprising each ABR borrowing shall bear interest at the ABR plus the applicable rate between 0.375% to 1.000%. The ABR is the highest of (a) the prime rate last quoted by The Wall Street Journal, (b) the Federal Reserve Bank of New York rate plus one half of 1%, and (c) the Adjusted Term Secured Overnight Financing Rate (“Term SOFR”) for a one month interest period plus 1%. The second base rate is the Term Benchmark rate and loans comprising each Term Benchmark borrowing shall bear interest at the Adjusted Term
SOFR, the Adjusted Euro Interbank Offered Rate, the Adjusted Stockholm Interbank Offered Rate, the Adjusted Canadian Dollar Offered Rate, Adjusted Australian Dollar Rate, the Adjusted Bank Bill Benchmark Rate or the Adjusted Tokyo Interbank Offered Rate, as applicable based on the currency denomination borrowed, plus the applicable rate between 1.375% to 2.000%. The third base rate is the Adjusted Daily Simple RepoFunds Rate (“RFR”) and loans comprising each Daily Simple RFR Loan shall bear interest at a rate per annum equal to the applicable Daily Simple RFR for Sterling or Dollars (as applicable) plus the applicable rate between 0.0326% to 0.100% depending on the loan denomination. We will also pay a commitment fee of between 0.175% and 0.250%, payable quarterly in arrears, on the average daily unused amount of the revolving facility based on our leverage ratio.
Our obligations under the Amended Credit Agreement are guaranteed by our existing and future wholly-owned domestic subsidiaries, and are secured by a first-priority security interest in substantially all of the assets of Dexcom and the guarantors, including all or a portion of the equity interests of our domestic subsidiaries and first-tier foreign subsidiaries but excluding real property and intellectual property (which is subject to a negative pledge). The Amended Credit Agreement contains covenants that limit certain indebtedness, liens, investments, transactions with affiliates, dividends and other restricted payments, subordinated indebtedness and amendments to subordinated indebtedness documents, and sale and leaseback transactions of Dexcom or any of its domestic subsidiaries. The Amended Credit Agreement also requires us to maintain a maximum leverage ratio and a minimum fixed charge coverage ratio. We were in compliance with these covenants as of September 30, 2023.
As of September 30, 2023, we also have a guarantee facility related to our international operations which is collateralized by a $5.3 million term deposit that is included in non-current “Other assets” on our consolidated balance sheets.