Tigo Energy, Inc. (TYGO)

Tigo, based in Los Gatos, California, makes module level power electronics, or MLPEs: small devices that sit under each solar panel. They have been its main product since it began in 2007 and bring in the substantial majority of its revenue; it has shipped about 16.6 million of them, to installations in over 100 countries. Sold as the TS4 line, they do up to three jobs at each panel: rapid shutdown, which quickly takes a rooftop system's voltage down to a safe level; monitoring, which lets installers pinpoint a failing panel and troubleshoot it remotely; and optimization, which offsets the energy lost when a panel is shaded, soiled or has aged differently from the rest. They are built as an open system that works with nearly every panel and inverter, the box that turns the panels' direct current into the alternating current a building uses; the rapid shutdown is certified with hundreds of inverters from more than fifteen makers. 303132333435363738

How it operates

Tigo, based in Los Gatos, California, makes module level power electronics, or MLPEs: small devices that sit under each solar panel. They have been its main product since it began in 2007 and bring in the substantial majority of its revenue; it has shipped about 16.6 million of them, to installations in over 100 countries. Sold as the TS4 line, they do up to three jobs at each panel: rapid shutdown, which quickly takes a rooftop system's voltage down to a safe level; monitoring, which lets installers pinpoint a failing panel and troubleshoot it remotely; and optimization, which offsets the energy lost when a panel is shaded, soiled or has aged differently from the rest. They are built as an open system that works with nearly every panel and inverter, the box that turns the panels' direct current into the alternating current a building uses; the rapid shutdown is certified with hundreds of inverters from more than fifteen makers. 303132333435363738

Around the MLPEs it sells two smaller lines, home storage and software. GO ESS, for homes in the United States and Europe, is built to keep a house powered in a grid outage: a battery, an inverter, an automatic transfer switch and an electric vehicle charger, sold together or separately; it brought in about 9.6 million dollars in 2025, up from 3.5 million. Its Energy Intelligence software comes free with most of its MLPEs, and a paid premium monitoring service made up less than 1% of revenue. Predict+, launched in January 2023, is software sold as a service that uses machine learning to forecast electricity generation and use for utilities, independent power producers and grid planners; it made up 1.5% of revenue. 39404142434445

It sells mostly through solar equipment distributors, which bring their own sales forces, logistics and credit to installers. It also sells directly to large installers and to EPC firms, the engineering, procurement and construction contractors, when volumes justify it, and to inverter makers that build its rapid shutdown into their inverters and bundle them with its optimizers. No customer reached a tenth of 2025 revenue; the largest took about 8.5%, against 7.9% in 2024. The distributors are not exclusive and many also sell rivals' products, and its agreements with its largest customers generally carry no long-term purchase commitments. At the end of 2025 two customers accounted for 22.5% and 10.6% of the money owed to it. 464748495051

Europe, the Middle East and Africa brought in 67.1% of 2025 revenue and the Americas 25.6%. Four European countries each took a tenth or more: Germany 15.5%, the Czech Republic 15.2%, the United Kingdom 15.1% and Italy 10.3%. The United States took 23.3%, up from 20.7% in 2024, and most North American revenue comes from commercial and industrial customers rather than homes. Sales run higher in the second and third quarters, with the weather and the building season. 5253545556

Tigo outsources its manufacturing, under a strategy it sums up as outsource, automate and localize. It relies mainly on two contract manufacturers, with plants in Thailand, Vietnam and China. Substantially all of its MLPEs are made in Thailand, and in October 2025 it moved production of GO ESS for the US market from China to Vietnam. It expected its relationship with one principal manufacturer, under an agreement dating from February 2021, to end in April 2026, and a newly engaged manufacturer has begun producing for it in Thailand. Its revenue is in US dollars, while part of its operating costs is in Israeli shekels, mostly payroll, and in euros. 57585960616263

The specifics

Tigo was incorporated in Delaware in 2007 and began operating in 2010. It became a public company on May 23, 2023 by combining with Roth CH Acquisition IV Co., a listed shell company formed to merge with a private business, which then took the name Tigo Energy, Inc. That year it also bought fSight, now Tigo Energy AI Ltd., the purchase behind the 12.2 million dollars of goodwill on its books. In January 2023, before the listing, L1 Energy Capital Management lent it 50.0 million dollars through a convertible note at 5.0% a year, due January 9, 2026; Tigo paid it off early, on December 17, 2025, for 51.3 million dollars including interest and fees, and ended 2025 with no debt. During 2025 it also sold 8,309,168 new shares through an at-the-market program, which sells shares gradually on the exchange, for about 14.2 million dollars before costs, and in February 2026 it sold 5,000,000 more in a registered direct offering for 15.0 million dollars before fees. 6423656667686970

On December 16, 2025 Tigo sold certain patents to Tigo Energy Innovations LLC, which the filing calls an unaffiliated third party. It received 15.0 million dollars at closing, with up to 3.0 million more held back until conditions are met and a right to up to 5.0 million dollars of future license proceeds; it kept a license to go on using the patents in its own products, and the sale produced a gain of 14.6 million dollars. At the end of 2025 it held 16 granted patents, which expire between 2029 and 2044, and 13 pending. 717273747576

Its optimizers are designed for ordinary string inverter systems, in which panels are wired in series to one central inverter: they stay in bypass until a panel falls out of step with the others, reach up to 99.7% efficiency, and can be fitted to just the panels that need them, trading cost against output. Its own studies credit the TS4-A-O optimizer with 8.7% more production on average than its models without optimization, and its X family, introduced in 2024, handles panels of up to 800W. Its MLPEs carry a 25-year warranty, against 12.5 years for its inverters and 11 for its batteries; that is longer than its own history of selling them, which the filing says makes its warranty estimates inherently uncertain. It names Enphase and SolarEdge as its main rivals in MLPEs, a market it describes as long served by two major suppliers, and SolarEdge, Enphase and Tesla in storage and software; low-cost Asian makers are entering too. 7778798081828314848586

Safety rules underpin its main market. The US National Electrical Code has required a rapid shutdown function on solar systems on buildings since 2014, to protect firefighters and emergency responders, and its 2017 edition added shutdown within the array itself, which devices at each panel can satisfy. Tax and trade rules have shifted under it. The One Big Beautiful Bill Act, signed in July 2025, ended the credit for homeowners who buy solar and storage with cash or loans on December 31, 2025, raised the domestic content needed for a bonus credit to 45% and added limits on content from so-called foreign entities of concern. All of its products imported into the United States faced tariffs at the end of 2025, and customs fees rose 1.5 million dollars, mostly from tariffs enacted in 2025. On December 18, 2025 it reworked a supply deal with EG4 Electronics: EG4 now buys Tigo's TS4-A-O optimizers and communication parts to build optimized inverters and is the one to claim the manufacturing tax credit under Section 45X, paying Tigo an agreed amount of any credit it receives. 878889909192939495

What drives growth, line by line

Revenue nearly doubled in 2025, up 91.7% to 103.5 million dollars, after a 62.8% fall in 2024 from 145.2 million in 2023, so it remained below its 2023 level. The company credits a recovery from the industry-wide slowdown that began in the second half of 2023, particularly in Europe and the United States, and its own gains in market share. By region, revenue rose 113.2% in Europe, the Middle East and Africa and 102.0% in the Americas, and fell 9.2% in Asia-Pacific. Tigo reports a single segment; the lines below are the product lines its annual report discusses. 96979899100101

MLPE products. The substantial majority of revenue. MLPE sales rose 42.1 million dollars, or 87.2%, which the filing puts down to the market recovery that began in the first quarter of 2024 and wider acceptance of its products. Europe carried most of the gain: MLPE sales there rose 33.1 million dollars on demand in Germany, the Czech Republic, the United Kingdom, Italy and Poland. In the Americas they rose 9.7 million on demand in the United States, including repowering, the refitting of existing solar systems with new equipment; in Asia-Pacific they fell 0.7 million, in Australia, the Philippines, Thailand and Singapore. 321029899103100

GO ESS. The fastest-growing line: about 9.6 million dollars against 3.5 million, up 6.2 million or 178.6%, which the filing puts down mainly to solar repowering. In Europe it rose 3.2 million dollars, including 3.1 million sold to one customer in Italy; in the Americas it rose 2.9 million, helped by more promotion. Part of what sold was stock written down in 2024, when Tigo booked 23.5 million dollars of inventory reserve charges, mainly for excess and slow-moving GO ESS units, and those sales carried a higher margin. 411049899103105106

Predict+, monitoring and royalties. The smallest lines. Predict+ made up 1.5% of revenue, down from 2.2% in 2024, and premium monitoring less than 1% in both years. Royalties added 0.5 million dollars in the Americas from a new royalty agreement signed in 2025. Since the December 2025 patent sale, the quarterly report for mid-2026 says, all royalty income is booked as other income rather than revenue. 454399103107

Profitability recovered too. Gross margin, the share of revenue left after the cost of the products, rose to 42.8% from a negative 7.7% in 2024, mainly because charges for excess and obsolete stock fell 88.8% and written-down GO ESS stock sold at a higher margin; cost of revenue rose only 1.7%, even with 1.5 million dollars more in customs fees. The operating loss narrowed to 4.5 million dollars from 52.0 million and the net loss to 1.9 million from 62.7 million, helped by the 14.6 million dollar gain on the patent sale, which outweighed the year's interest on the convertible note. 108106109929675110

What comes next, in the company's own words: it plans to grow in US home solar through residential solar providers and in Europe, where it has begun offering its residential products in Italy and Germany, while it expects near-term revenue to stay concentrated among existing customers. It expects growing demand for batteries to raise the share of solar installations sold with storage. It also warns that the new tax rules have affected, and could further hurt, demand for its products and its eligibility for credits. 55111112113114

Since the annual report, the quarterly report for the first half of 2026 shows net revenue up 7.7 million dollars, or 18.0%, on a year earlier, with MLPE sales up 18.7% and GO ESS up 44.1%, including 3.4 million dollars of GO ESS bought by a customer in Italy. On March 31, 2026 Tigo also opened a revolving credit line of up to 10.0 million dollars with Wells Fargo. 115116117

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What the desk infers Inferred

1. Inferred

   The patents Tigo sold in December 2025 were most likely the ones behind its royalty revenue: the sale swapped a licensing stream it had counted as revenue for 15.0 million dollars at closing and a capped share of future license money, now booked outside revenue.

   Because

   • Royalty revenue rose by 0.5 million dollars in the Americas in 2025, from a new royalty agreement signed that year. 99103
   • In December 2025 it sold certain patents to an unaffiliated buyer, received 15.0 million dollars at closing and kept a license to use them in its own products. 717274
   • The sale leaves it a right to up to 5.0 million dollars of future license proceeds, to be booked as other income when earned. 73
   • The quarterly report says all royalty income is now booked as other income following the patent sale, where a year earlier royalties counted as revenue. 107
   Confidence 75 of 100Wrong if A filing that names the patents licensed under the 2025 royalty agreement as patents Tigo still owns.
2. Inferred

   Part of the 42.8% gross margin of 2025 came from selling storage stock whose cost had already been written down in 2024, so the margin on newly made products is likely lower than the year's figure suggests.

   Because

   • In 2024 Tigo booked 23.5 million dollars of inventory reserve charges, mainly for excess and slow-moving GO ESS stock. 105
   • The filing credits the 2025 recovery in gross margin partly to higher-margin sales of that previously reserved GO ESS stock. 106
   • Gross margin was 42.8% in 2025, against a negative 7.7% the year before. 108
   • Cost of revenue rose 1.7% while revenue rose 91.7%. 10996
   Confidence 70 of 100Wrong if A filing that shows the sales of previously reserved GO ESS stock in 2025 were too small to move the year's gross margin by a full percentage point.
3. Inferred

   GO ESS, the storage line, rests on two outlets: the United States and one large buyer in Italy, which took about a third of the line's revenue in 2025.

   Because

   • GO ESS brought in about 9.6 million dollars in 2025. 41
   • Of that, 3.1 million dollars went to one customer in Italy. 98
   • GO ESS made up 23.1% of US revenue and the United States 23.3% of total revenue of 103.5 million dollars, which places most of the rest of the line in the United States. 6096
   • In the first half of 2026 a customer in Italy bought another 3.4 million dollars of GO ESS. 116
   Confidence 65 of 100Wrong if A filing showing that the Italian GO ESS sales of 2025 and 2026 went to several unrelated customers, or that no single customer took more than a tenth of GO ESS revenue.
4. Inferred

   Tigo is reaching US buyers who want American-made content through a partner rather than a factory of its own: EG4 builds optimized inverters in the United States from Tigo's parts and is to claim the manufacturing credit and share it with Tigo.

   Because

   • The 2025 tax law raised the domestic content needed for a bonus credit and added limits on content from foreign entities of concern. 90
   • Its own products are made by contract manufacturers in Thailand, Vietnam and China, and all its imports into the United States faced tariffs at the end of 2025. 5991
   • The first EG4 agreement, in August 2025, noted that making the optimized inverters within the United States would qualify for the manufacturing credit. 11893
   • The December 2025 version has EG4 buy Tigo's optimizers and communication parts, build the inverters, claim the credit and pay Tigo an agreed amount. 9495
   • In the first half of 2026 a US-based contract manufacturer began producing components for the EG4 products, and no credit had yet been recognized. 119
   Confidence 65 of 100Wrong if A filing showing that the optimized inverters under the EG4 agreement are built outside the United States, or that Tigo builds its own US factory for them.