enph-20210427
0001463101false00014631012021-04-272021-04-27

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
________________________________________________
FORM 8-K
________________________________________________

CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 27, 2021
________________________________________________
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ENPHASE ENERGY, INC.
(Exact name of registrant as specified in its charter)
________________________________________________

Delaware 001-35480 20-4645388
(State or other Jurisdiction of Incorporation) (Commission File No.) (IRS Employer Identification No.)

47281 Bayside Parkway
Fremont, CA 94538
(Address of principal executive offices, including zip code)
(877) 774-7000
(Registrant’s telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Stock, $0.00001 par value per shareENPHNasdaq Global Market
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 





Item 2.02. Results of Operations and Financial Condition.
On April 27, 2021, Enphase Energy, Inc. (the “Company”) issued a press release announcing the Company’s financial results for the first quarter ended March 31, 2021. A copy of the press release is furnished as Exhibit 99.1 to this report.
The information in Item 2.02 of this Form 8-K and the exhibit 99.1 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), and shall not be incorporated by reference in any registration statement or other document filed under the Securities Act or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in such filings, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01. Financial Statements and Exhibits.
(d)Exhibits. 
Exhibit NumberDescription




SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date:April 27, 2021ENPHASE ENERGY, INC.
 By:/s/ Eric Branderiz
  Eric Branderiz
  Executive Vice President and Chief Financial Officer



Document

Exhibit 99.1
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Enphase Energy Reports Financial Results for the First Quarter of 2021
FREMONT, Calif., April 27, 2021 - Enphase Energy, Inc. (NASDAQ: ENPH), a global energy management technology company and the world’s leading supplier of microinverter-based solar-plus-storage systems, announced today financial results for the first quarter of 2021, which included the summary below from its President and CEO, Badri Kothandaraman.
We reported quarterly revenue of $301.8 million in the first quarter of 2021, along with 41.1% for non-GAAP gross margin. We shipped approximately 830 megawatts DC, or 2,452,765 microinverters. In addition, we acquired two companies to accelerate our digital transformation – Sofdesk, Inc., which provides solar design software to installers, and the Solar Design Services business of DIN Engineering Services, LLP, which provides permitting and proposal services to installers.
Financial highlights for the first quarter of 2021 are listed below.
Revenue of $301.8 million
Cash flow from operations of $75.8 million; ending cash balance of $1,489.0 million
GAAP gross margin of 40.7%; non-GAAP gross margin of 41.1%
GAAP operating income of $61.4 million; non-GAAP operating income of $80.2 million
GAAP net income of $31.7 million, including a non-cash loss of $56.4 million on the partial settlement of convertible notes; non-GAAP net income of $78.7 million
GAAP diluted earnings per share of $0.22; non-GAAP diluted earnings per share of $0.56
Our revenue and earnings for the first quarter of 2021 are provided below, compared with those of the prior quarter and the year ago quarter:
(In thousands, except per share data and percentages)
GAAPNon-GAAP
Q1 2021Q4 2020Q1 2020*Q1 2021Q4 2020Q1 2020*
Revenue$301,754 $264,839 $205,545 $301,754 $264,839 $205,545 
Gross margin40.7 %46.0 %39.2 %41.1 %40.2 %39.5 %
Operating expenses$61,563 $42,824 $35,963 $43,699 $34,193 $28,508 
Operating income$61,386 $79,114 $44,712 $80,232 $72,356 $52,773 
Net income$31,698 $72,991 $68,936 $78,702 $71,342 $51,875 
Basic EPS$0.24 $0.57 $0.56 $0.60 $0.56 $0.42 
Diluted EPS$0.22 $0.50 $0.50 $0.56 $0.51 $0.38 
* Revenue for the first quarter of 2020 of $205.5 million included approximately $44.5 million of safe harbor revenue.
Total revenue increased 14% compared to the fourth quarter of 2020 as we continued to experience strong worldwide demand for our solar and storage systems. We reported record quarterly revenue in the U.S., Europe, and Australia, despite normal seasonality in the first quarter. Our operations team did an excellent job of navigating component supply constraints to best service our customer demand, while improving inventory in the channel.
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Our non-GAAP gross margin increased to 41.1% in the first quarter of 2021, from 40.2% in the fourth quarter of 2020, driven by disciplined pricing and cost management. Non-GAAP operating expenses increased to $43.7 million in the first quarter of 2021, compared to $34.2 million in the prior quarter, primarily due to increased investments in research and development, increased hiring, payroll tax associated with employee stock vesting, and the consolidation of Sofdesk operations in late January. Non-GAAP operating income was $80.2 million, compared to $72.4 million in the prior quarter.
We exited the first quarter of 2021 with $1,489.0 million in cash and generated $75.8 million in cash flow from operations. The cash balance includes net proceeds of approximately $1,189.4 million from the convertible notes issuance in March 2021 and is partially offset by $304.8 million paid in principal amounts for the partial repurchase and conversions of the convertible notes due 2024 and 2025. Inventory was $34.9 million at the end of the first quarter of 2021, compared to $41.8 million at the end of the fourth quarter of 2020. The sequential decrease in our inventory was driven by an increase in customer demand coupled with supply constraints.
We made good progress on the rollout of our Enphase Storage systems by reducing commissioning times. We introduced 24/7 global customer support and are pleased to resume in-person installer training, while also continuing our online certification. In addition, we recently expanded our Enphase Installer Network (EIN) in the Netherlands and Belgium, after successful launches in the U.S. and Australia. Our EIN installers can enjoy a variety of tools and services on Enphase’s digital platform to help make the sales and installation process faster and easier, while providing an exceptional experience to homeowners across the globe.
BUSINESS HIGHLIGHTS
On March 29, 2021, Enphase Energy announced that it entered into an agreement with Rubicon Energy to distribute Enphase IQ™ microinverters for grid-tied photovoltaic (PV) applications to residential and commercial installers in the fast-growing South African market. To cater to the higher power modules utilized in the region, Rubicon Energy will predominantly distribute Enphase IQ 7A™ microinverters to residential and commercial installers.
On April 1, 2021, Enphase Energy announced that it completed the previously announced acquisition of the Solar Design Services business of DIN Engineering Services LLP. Based in Noida, India, the business is a leading provider of outsourced proposal drawings and permit plan sets for residential solar installers in North America.
On April 7, 2021, Enphase Energy announced that it is now providing 24/7 support for installers and Enphase system owners globally across its phone, online chat, and email communications channels. Providing around-the-clock support builds on the commitment Enphase has made to delivering the industry’s best customer experience. In recent years, Enphase has introduced online chat support; the Enphase Community platform for direct engagement with other Enphase system owners; Enphase University, an advanced online learning platform; and rapid, remote microinverter activation and returns processing with the Service-on-the-Go tool.
On April 8, 2021, Enphase Energy announced that after successful launches of its Enphase Installer Network (EIN) in the U.S. and Australia in 2020, the Company has expanded EIN into the Netherlands and Belgium, with more European countries to follow during 2021. The EIN recognizes a network of trusted installers that deliver exceptional homeowner experiences using Enphase products and is designed to help Enphase installers grow their business with a range of innovative digital tools and exclusive benefits.
SECOND QUARTER 2021 FINANCIAL OUTLOOK
For the second quarter of 2021, Enphase Energy estimates both GAAP and non-GAAP financial results as follows:
Revenue to be within a range of $300.0 million to $320.0 million
GAAP gross margin to be within a range of 37.0% to 40.0%; non-GAAP gross margin to be within a range of 38.0% to 41.0%, excluding stock-based compensation expenses
GAAP operating expenses to be within a range of $70.0 million to $73.0 million, including $17.0 million estimated for stock-based compensation expenses and acquisition related costs and amortization
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Non-GAAP operating expenses to be within a range of $53.0 million to $56.0 million, excluding $17.0 million estimated for stock-based compensation expenses and acquisition related costs and amortization. The non-GAAP estimates include increased investments in new products, software, and marketing and a $3.5 million accrual for deferred consideration from the acquisitions.
All guidance estimates for the second quarter of 2021 include operations of both Sofdesk and DIN’s Solar Design Services business for the entire quarter.
Follow Enphase Online
Read the Enphase blog.
Follow @Enphase on Twitter.
Visit us on Facebook and LinkedIn.
Watch Enphase videos on YouTube.
Use of Non-GAAP Financial Measures
The Company has presented certain non-GAAP financial measures in this press release. Generally, a non-GAAP financial measure is a numerical measure of a company’s performance, financial position, or cash flows that either exclude or include amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with generally accepted accounting principles in the United States of America, or GAAP. Reconciliation of each non-GAAP financial measure to the most directly comparable GAAP financial measure can be found in the accompanying tables to this press release. Non-GAAP financial measures presented by the Company include non-GAAP gross profit, gross margin, operating expenses, income from operations, net income and net income per share.
These non-GAAP financial measures do not reflect a comprehensive system of accounting, differ from GAAP measures with the same captions and may differ from non-GAAP financial measures with the same or similar captions that are used by other companies. In addition, these non-GAAP measures have limitations in that they do not reflect all of the amounts associated with the Company’s results of operations as determined in accordance with GAAP. As such, these non-GAAP measures should be considered as a supplement to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP. The Company uses these non-GAAP financial measures to analyze its operating performance and future prospects, develop internal budgets and financial goals, and to facilitate period-to-period comparisons. The Company believes that these non-GAAP financial measures reflect an additional way of viewing aspects of its operations that, when viewed with its GAAP results, provide a more complete understanding of factors and trends affecting its business.
As presented in the “Reconciliation of Non-GAAP Financial Measures” tables in the accompanying press release, each of the non-GAAP financial measures excludes one or more of the following items for purposes of calculating non-GAAP financial measures to facilitate an evaluation of the Company’s current operating performance and a comparison to its past operating performance:
Stock-based compensation expense. The Company excludes stock-based compensation expense from its non-GAAP measures primarily because they are non-cash in nature. Moreover, the impact of this expense is significantly affected by the Company’s stock price at the time of an award over which management has limited to no control.
Tariff refunds. This item represents approved tariff refunds, and interest income earned on those refunds, by the U.S. Customs and Border Protection that qualify for the tariff exclusion on Chinese imported microinverter products that fit the dimensions and weight limits within a Section 301 Tariff exclusion under U.S. note 20(ss)(40) to subchapter III of chapter 99 of the Harmonized Tariff Schedule of the United States. Approved refunds relate to tariffs previously paid from September 24, 2018 to March 31, 2020 and are excluded from the non-GAAP measures as the refunds are non-recurring in nature for tariff costs incurred in the past and are not reflective of the Company’s ongoing financial performance.
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Acquisition related expenses and amortization. This item represents expenses incurred related to the Company’s business acquisitions, which are non-recurring in nature, and amortization of acquired intangible assets, which is a non-cash expense. Acquisition related expenses and amortization of acquired intangible assets are not reflective of the Company's ongoing financial performance.
Non-cash interest expense. This item consists primarily of amortization of debt issuance costs and accretion of debt discount because these expenses do not represent a cash outflow for the Company except in the period the financing was secured and such amortization expense is not reflective of the Company’s ongoing financial performance.
Loss on partial settlement of convertible notes. This item is reflected in other income (expense), net and represents (i) the difference between the carrying value and the fair value of the settled convertible notes and (ii) the inducement loss for the difference between the value of the shares issued to settle the convertible notes and the value of the shares that would have been issued under the original conversion terms with respect to the repurchased Notes due 2025, which is non-cash in nature and is not reflective of the Company’s ongoing financial performance.
Change in fair value of derivatives. This item is reflected in other income (expense), net and represents changes in fair value of the conversion option in the convertible notes due 2025, as well as the convertible note hedge and warrant transactions, which is non-cash in nature and is not reflective of the Company’s ongoing financial performance.
Non-GAAP income tax adjustment. This item represents the amount adjusted to the Company’s GAAP tax provision or benefit to present the non-GAAP tax amount based on cash tax expense and reserves.
Free cash flow. This item represents net cash flows from operating activities plus deemed repayment of convertible notes attributable to accreted debt discount reported in operating activities less purchases of property and equipment.
Conference Call Information
Enphase Energy will host a conference call for analysts and investors to discuss its first quarter 2021 results and second quarter 2021 business outlook today at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time). The call is open to the public by dialing (877) 644-1284; participant passcode 3396792. A live webcast of the conference call will also be accessible from the “Investor Relations” section of the Company’s website at investor.enphase.com. Following the webcast, an archived version will be available on the website for approximately one year. In addition, an audio replay of the conference call will be available by calling (855) 859-2056; participant passcode 3396792, beginning approximately one hour after the call.
Forward-Looking Statements
This press release contains forward-looking statements, including statements related to Enphase Energy’s expectations as to future financial performance, expense levels, liquidity sources, the capabilities, advantages, and performance of our technology and products, including the ability to simplify and reduce installation time, our business strategies and anticipated demand for our products, the capabilities and performance of our partners, and the impact to homeowners. These forward-looking statements are based on the Company’s current expectations and inherently involve significant risks and uncertainties. Enphase Energy’s actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of certain risks and uncertainties including those risks described in more detail in the Company’s most recent Annual Report on Form 10-K and other documents on file with the SEC and available on the SEC’s website at www.sec.gov. Enphase Energy undertakes no duty or obligation to update any forward-looking statements contained in this release as a result of new information, future events or changes in its expectations, except as required by law.
A copy of this press release can be found on the investor relations page of Enphase Energy’s website at investor.enphase.com.
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About Enphase Energy, Inc.
Enphase Energy, a global energy technology company, delivers smart, easy-to-use solutions that manage solar generation, storage and communication on one intelligent platform. The Company revolutionized the solar industry with its microinverter-based technology and produces a fully integrated solar-plus-storage solution. Enphase has shipped more than 34 million microinverters, and approximately 1.5 million Enphase-based systems have been deployed in more than 130 countries. For more information, visit www.enphase.com.
Enphase Energy, Enphase, the E logo, IQ, IQ 7A, and other trademarks or service names are the trademarks of Enphase Energy, Inc.
Contact:
Adam Hinckley
Enphase Energy, Inc.
Investor Relations
ir@enphaseenergy.com
+1-707-763-4784 x7354
5


ENPHASE ENERGY, INC.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share data)
(Unaudited)

Three Months Ended
March 31,
2021
December 31,
2020
March 31,
2020
Net revenues$301,754 $264,839 $205,545 
Cost of revenues (1)178,805 142,901 124,870 
Gross profit122,949 121,938 80,675 
Operating expenses:
Research and development21,818 15,801 11,876 
Sales and marketing19,622 14,139 11,772 
General and administrative20,123 12,884 12,315 
Total operating expenses61,563 42,824 35,963 
Income from operations61,386 79,114 44,712 
Other income (expense), net
Interest income73 673 1,091 
Interest expense(7,329)(5,901)(3,155)
Other income (expense), net573 503 (924)
Loss on partial settlement of convertible notes (2)(56,369)(3,037)— 
Change in fair value of derivatives (3)— — 15,344 
Total other income (expense), net(63,052)(7,762)12,356 
Income (loss) before income taxes(1,666)71,352 57,068 
Income tax benefit33,364 1,639 11,868 
Net income$31,698 $72,991 $68,936 
Net income per share:
Basic$0.24 $0.57 $0.56 
Diluted$0.22 $0.50 $0.50 
Shares used in per share calculation:
Basic131,303 126,980 123,531 
Diluted146,442 145,990 138,104 

(1)    We sought refunds totaling approximately $38.9 million plus $0.6 million accrued interest on tariffs previously paid from September 24, 2018 to March 31, 2020 for certain microinverters that qualify for the tariff exclusion on Chinese imported microinverter products that fit the dimensions and weight limits within a Section 301 Tariff exclusion under U.S. note 20(ss)(40) to subchapter III of chapter 99 of the Harmonized Tariff Schedule of the United States. The refund request was subject to review and approval by the U.S. Customs and Border Protection; therefore, we assessed the probable loss recovery in the three months ended December 31, 2020 was equal to the $16.5 million approved refund requests available to us. For the three months ended December 31, 2020, we have recorded $15.9 million as a reduction to cost of revenues and $0.6 million as interest income in our consolidated statements of operations as the approved refunds relate to paid tariffs previously recorded to cost of revenues. No tariff refunds were recorded as a reduction to cost of revenues in the three months ended March 31, 2021 and 2020.
(2)    Loss on partial settlement of convertible notes of $56.4 million for the three months ended March 31, 2021 primarily relates to the $9.5 million non-cash loss on partial settlement of $87.1 million aggregate principal amount of the Notes due 2024, $9.4 million non-cash loss on partial settlement of $217.7 million aggregate principal amount of the Notes due 2025 and $37.5 million non-cash inducement loss incurred on repurchase of Notes due 2025. Loss on partial settlement of convertible notes of $3.0 million for the three months ended December 31, 2020 is related to partial settlement of $43.9 million aggregate principal amount of the Notes due 2024.
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(3)    Change in fair value of derivatives of $15.3 million for the three months ended March 31, 2020 represents changes in fair value of the conversion option in the Notes due 2025, as well as the convertible note hedge and warrant transactions. Initially, conversion of the Notes due 2025 would be settled solely in cash as a result of the Company not having the necessary number of authorized but unissued shares of its common stock available to settle the conversion option of the Notes due 2025 in shares; therefore, the conversion option, convertible note hedge and warrant transactions were classified as derivatives that required marked-to-market accounting. On May 20, 2020, at the Company’s annual meeting of stockholders, the stockholders approved an amendment to its certificate of incorporation to increase the number of authorized shares of the Company’s common stock. As a result, the Company is now able to settle the Notes due 2025, convertible notes hedge and warrants through payment or delivery, as the case may be, of cash, shares of its common stock or a combination thereof, at the Company’s election. Accordingly, on May 20, 2020, the conversion option, convertible note hedge and warrant transactions were remeasured at fair value and were then reclassified to additional paid-in-capital in the condensed consolidated balance sheet in the second quarter of 2020 and are no longer remeasured as long as they continue to meet the conditions for equity classification.

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ENPHASE ENERGY, INC.
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands)
(Unaudited)
March 31,
2021
December 31,
2020
ASSETS
Current assets:
Cash and cash equivalents$1,489,010 $679,379 
Accounts receivable, net236,090 182,165 
Inventory34,876 41,764 
Prepaid expenses and other assets31,386 29,756 
Total current assets1,791,362 933,064 
Property and equipment, net53,648 42,985 
Operating lease, right of use asset, net16,688 17,683 
Intangible assets, net47,917 28,808 
Goodwill61,038 24,783 
Other assets91,315 59,875 
Deferred tax assets, net132,231 92,904 
Total assets$2,194,199 $1,200,102 
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable$81,524 $72,609 
Accrued liabilities115,172 76,542 
Deferred revenues, current49,118 47,665 
Warranty obligations, current14,303 11,260 
Debt, current84,356 325,967 
Total current liabilities344,473 534,043 
Long-term liabilities:
Deferred revenues, noncurrent142,985 125,473 
Warranty obligations, noncurrent40,250 34,653 
Other liabilities15,777 17,042 
Debt, noncurrent917,873 4,898 
Total liabilities1,461,358 716,109 
Total stockholders’ equity732,841 483,993 
Total liabilities and stockholders’ equity$2,194,199 $1,200,102 


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ENPHASE ENERGY, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(Unaudited)
Three Months Ended
March 31,
2021
December 31,
2020
March 31,
2020
Cash flows from operating activities:
Net income$31,698 $72,991 $68,936 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization5,558 5,353 3,844 
Provision for doubtful accounts14 171 104 
Loss on partial settlement of convertibles notes56,369 3,037 — 
Deemed repayment of convertible notes attributable to accreted debt discount(15,579)(3,132)— 
Non-cash interest expense7,156 5,309 2,722 
Change in fair value of debt security(1,437)— — 
Stock-based compensation14,844 8,289 7,515 
Change in fair value of derivatives— — (15,344)
Deferred income taxes(35,367)(2,610)(12,500)
Changes in operating assets and liabilities:
Accounts receivable(53,719)(57,854)49,637 
Inventory6,888 (4,229)(2,560)
Prepaid expenses and other assets(5,040)(4,185)(5,009)
Accounts payable, accrued and other liabilities36,376 44,895 (22,066)
Warranty obligations8,640 2,134 403 
Deferred revenues19,440 14,011 (36,460)
Net cash provided by operating activities75,841 84,180 39,222 
Cash flows from investing activities:
Purchases of property and equipment(9,940)(8,851)(3,353)
Investment in a private company(25,000)(5,010)— 
Business acquisitions, net of cash acquired(55,239)— — 
Net cash used in investing activities(90,179)(13,861)(3,353)
Cash flows from financing activities:
Issuance of convertible notes, net of issuance costs1,189,388 — 313,011 
Purchase of convertible note hedges(286,235)— (89,056)
Sale of warrants220,800 — 71,552 
Principal payments and financing fees on debt(1,078)(306)(1,148)
Partial repurchase of convertible notes(289,233)(40,728)— 
Proceeds from exercise of equity awards and employee stock purchase plan214 3,687 1,979 
Payment of withholding taxes related to net share settlement of equity awards(9,185)(16,288)(34,267)
Net cash provided by financing activities824,671 (53,635)262,071 
Effect of exchange rate changes on cash and cash equivalents(702)903 (205)
Net increase in cash, cash equivalents and restricted cash809,631 17,587 297,735 
Cash, cash equivalents and restricted cash—Beginning of period679,379 661,792 296,109 
Cash. cash equivalents and restricted cash—End of period$1,489,010 $679,379 $593,844 

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ENPHASE ENERGY, INC.
RECONCILIATION OF NON-GAAP FINANCIAL MEASURES
(In thousands, except per share data and percentages)
(Unaudited)
Three Months Ended
March 31,
2021
December 31,
2020
March 31,
2020
Gross profit (GAAP)
$122,949 $121,938 $80,675 
Stock-based compensation982 522 606 
Tariff refunds— (15,911)— 
Gross profit (Non-GAAP)
$123,931 $106,549 $81,281 

Gross margin (GAAP)
40.7 %46.0 %39.2 %
Stock-based compensation0.4 %0.2 %0.3 %
Tariff refunds— %(6.0)%— %
Gross margin (Non-GAAP)
41.1 %40.2 %39.5 %

Operating expenses (GAAP)
$61,563 $42,824 $35,963 
Stock-based compensation (1)(13,862)(7,767)(6,909)
Acquisition related expenses and amortization(4,002)(864)(546)
Operating expenses (Non-GAAP)
$43,699 $34,193 $28,508 

(1) Includes stock-based compensation as follows:
Research and development
$5,749 $3,271 $1,919 
Sales and marketing
3,537 2,044 1,942 
General and administrative
4,576 2,452 3,048 
Total
$13,862 $7,767 $6,909 

Income from operations (GAAP)$61,386 $79,114 $44,712 
Stock-based compensation14,844 8,289 7,515 
Tariff refunds— (15,911)— 
Acquisition related expenses and amortization4,002 864 546 
Income from operations (Non-GAAP)$80,232 $72,356 $52,773 

Net income (GAAP)$31,698 $72,991 $68,936 
Stock-based compensation14,844 8,289 7,515 
Tariff refunds— (16,538)— 
Acquisition related expenses and amortization4,002 864 546 
Non-cash interest expense7,156 5,309 2,722 
Loss on partial settlement of convertible notes56,369 3,037 — 
Change in fair value of derivatives— — (15,344)
Non-GAAP income tax adjustment(35,367)(2,610)(12,500)
Net income (Non-GAAP)$78,702 $71,342 $51,875 
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Three Months Ended
March 31,
2021
December 31,
2020
March 31,
2020

Net income per share, basic (GAAP)$0.24 $0.57 $0.56 
Stock-based compensation0.11 0.07 0.06 
Tariff refunds— (0.13)— 
Acquisition related expenses and amortization0.03 0.01 — 
Non-cash interest expense0.05 0.04 0.02 
Loss on partial settlement of convertible notes0.43 0.02 — 
Change in fair value of derivatives— — (0.12)
Non-GAAP income tax adjustment(0.26)(0.02)(0.10)
Net income per share, basic (Non-GAAP)$0.60 $0.56 $0.42 
Shares used in basic per share calculation GAAP and Non-GAAP131,303 126,980 123,531 
Net income per share, diluted (GAAP)$0.22 $0.50 $0.50 
Stock-based compensation0.11 0.07 0.06 
Tariff refunds— (0.12)— 
Acquisition related expenses and amortization0.03 0.01 — 
Non-cash interest expense0.05 0.04 0.02 
Loss on partial settlement of convertible notes0.40 0.02 — 
Change in fair value of derivatives— — (0.11)
Non-GAAP income tax adjustment(0.25)(0.01)(0.09)
Net income per share, diluted (Non-GAAP) (2)$0.56 $0.51 $0.38 
Shares used in diluted per share calculation GAAP146,442 145,990 138,104 
Shares used in per share calculation Non-GAAP (3)141,746 139,527 135,168 
Net cash provided by operating activities (GAAP)$75,841 $84,180 $39,222 
Purchases of property and equipment(9,940)(8,851)(3,353)
Deemed repayment of convertible notes due 2024 and notes due 2025 attributable to accreted debt discount15,579 3,132 — 
Free cash flow (Non-GAAP)$81,480 $78,461 $35,869 

(2)    Calculation of non-GAAP diluted net income per share for the three months ended March 31, 2021, December 31, 2020 and March 31, 2020 excludes convertible notes due 2023 interest expense, net of tax of less than $0.1 million in each period from non-GAAP net income.
(3)    Effect of dilutive in-the-money portion of convertible senior notes and warrants are included in the GAAP weighted-average diluted shares in periods where the Company has GAAP net income. The Company excluded the in-the-money portion of convertible notes due 2024 totaling 2,984 thousand shares, 5,063 thousand shares and 2,936 thousand shares in the three months ended March 31, 2021, December 31, 2020 and March 31, 2020, respectively, from non-GAAP weighted-average diluted shares as the Company entered into convertible note hedge transactions that reduce potential dilution to the Company’s common stock upon any conversion of the notes due 2024. The Company excluded the in-the-money portion of convertible notes due 2025 totaling 1,713 thousand shares and 1,401 thousand shares in the three months ended March 31, 2021 and December 31, 2020, respectively, from non-GAAP weighted-average diluted shares as the Company entered into convertible note hedge transactions that reduce potential dilution to the Company’s common stock upon any conversion of the notes due 2025.
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