The Hidden Reef of the "Subsidy King": The Billion-Yuan Capital Battle Behind the Detention of San'an Optoelectronics' Actual Controller

Does AI · Lin Xiucheng's detention reveal risks in subsidy dependency models?

A thunderclap in a clear sky.

Wu Wei, Investor Network

On March 22, 2026, Sanan Optoelectronics issued an official announcement confirming that on March 21, the company received notice from its controlling shareholder, Fujian Sanan Group Co., Ltd., that its actual controller, Lin Xiucheng, has been placed under detention by the National Supervisory Commission and is under investigation. In response to market shock, Sanan Optoelectronics quickly stated that Lin Xiucheng has resigned from his position as chairman since July 10, 2017, and currently holds no positions in the listed company. The company's production and operations are normal, and this matter will not significantly impact daily business.

Image source: Company announcement

But in the turbulent capital markets, a detention notice often only reveals the tip of the iceberg. There are three core anomalies in this incident that warrant market attention. First is the subtle timing. The announcement was made at a time when Sanan Optoelectronics reported extremely pressured financial forecasts, expecting a net profit attributable to parent of a loss between 200 million and 400 million yuan for 2025 — the first annual loss since its 2008 reverse merger listing.

Second is the special nature of the enforcement agency involved in the detention. “Detention” is carried out by the national supervisory authorities, implying that Lin Xiucheng’s case likely involves public officials or the transfer of strategic national resources, rather than ordinary economic disputes. Lastly, there is the projection of historical connections. As a well-known “subsidy giant” in A-shares and a core target of major funds, against the backdrop of intensified national scrutiny of industrial subsidies and semiconductor anti-corruption efforts, the downfall of the actual controller may push Sanan Optoelectronics’ long-dependent political-business deep binding model into an unknown abyss. Following the announcement on March 23, Sanan Optoelectronics’ stock opened at the limit down.

From “Scrap Iron King” to Optoelectronic Giant, Lin Xiucheng’s Wealth Leap and Asset Map

To understand this incident deeply, one might start with Lin Xiucheng’s rise. It’s a quintessential, highly era-specific story of Fujian businessmen’s rapid ascent.

Born in Anxi, Quanzhou, Fujian in the 1980s, Lin Xiucheng initially accumulated capital through trading scrap steel. In 1992, he officially founded Fujian Sanan Group, rapidly expanding through mergers and asset integration in Anxi, Sanming, and other areas, building a large steel empire. He was once dubbed the “Southern Fujian Scrap Iron King” by industry insiders.

However, Lin Xiucheng’s business acumen was not limited to traditional heavy industries with excess capacity. In 2000, he keenly grasped the policy shift towards high-tech industries, decisively relocating the company headquarters to Xiamen and establishing Xiamen Sanan Electronics, officially crossing into the highly monopolized LED epitaxial wafers and chip sectors at the time, dominated by US and Japanese firms.

By introducing overseas technical teams and aggressively investing in equipment, Sanan quickly established a leading position in China’s LED industry. In 2008, Lin Xiucheng’s pivotal moment arrived: Sanan Optoelectronics successfully went public via a reverse merger (stock code 600703.SH), marking the start of a “capital operation + industrial expansion” dual-drive era.

After nearly two decades of strategic layout, Lin Xiucheng’s family built a vast capital empire spanning listed and unlisted entities. Through Fujian Sanan Group Co., Ltd. and Xiamen Sanan Electronics Co., Ltd., he held a combined 29% stake in Sanan Optoelectronics, maintaining tight control over this billion-yuan (at peak) listed platform.

Via the listed company, the Sanan Group also controls Sanan Integrated Circuits, focusing on compound semiconductors and RF chips, as well as multiple heavy-asset semiconductor industrial parks in Quanzhou, Changsha, Chongqing, and other locations. With this asset expansion, Lin Xiucheng and his son Lin Zhiqiang ranked among Xiamen’s top wealthy figures, with a combined wealth of 16 billion yuan on the 2026 Hurun Global Rich List. But now, it appears that the underlying logic of this vast wealth is under severe scrutiny by the national supervisory authorities.

Political-business symbiosis and capacity backlash, the rise and fall under billion-yuan subsidies

Sanan Optoelectronics’ rise in the A-share market is quite rare. Its development has often been deeply intertwined with local governments, summarized as “government endorsement, massive subsidies, and major project implementation.”

As the actual controller, Lin Xiucheng excelled at linking the company’s business expansion with local government “performance indicators,” leveraging minimal own funds to mobilize large-scale government land, fiscal subsidies, and state capital investments. This model was pushed to the extreme during the expansion in Wuhu, Anhui around 2010.

At that time, Wuhu municipal government provided subsidies of up to 10 million yuan per MOCVD equipment purchased by Sanan. Using this “government pays for equipment, company manages production” approach, Sanan rapidly accumulated initial capacity at low cost. Riding the wave of China’s “domestic substitution” strategy in semiconductors, this leverage model was quickly scaled and replicated nationwide.

For example, the Changsha project in Hunan, with a total investment of 16 billion yuan, saw Sanan build China’s first full silicon carbide (SiC) industry chain, with comprehensive support from local government in land and financing. The Quanzhou project in Fujian, with over 30 billion yuan in investment, developed capacity for GaN, GaAs, and IC packaging, becoming a key provincial project. In Chongqing, Sanan partnered with STMicroelectronics, with a total investment of about 30 billion yuan, supported by local land and financing policies.

Relying on subsidies and other non-recurring gains, from 2022 to 2024, despite the company’s non-recurring net losses of 310 million, 1.088 billion, and 511 million yuan respectively, Sanan still reported net profits attributable to parent of 685 million, 367 million, and 253 million yuan.

Image source: Eastmoney PC

With major projects underway, state-owned capital at various levels has deeply involved in Sanan’s capital structure. However, according to the latest data in March 2026, apart from early-stage involvement by the first phase of the National Fund, recent state capital investments in Sanan have faced significant asset devaluation pressures.

Local state assets in Xiamen, Quanzhou, Changsha, and other regions, which entered during the peak expansion period of 2021-2022, generally bought in at over 15 yuan per share. Now, they face hundreds of millions in unrealized losses and are burdened with debt risks from supporting industrial parks. Given Sanan’s high capital expenditure from 2020-2024, with dividends per share only around 0.05 to 0.15 yuan, these modest returns hardly offset the over-15-yuan cost basis of state holdings.

The “black hole” of power semiconductor capacity may be the direct cause of the state capital’s heavy losses in Sanan. As Sanan transitions into SiC and integrated circuits, it may have encountered severe capacity digestion issues. In 2025, the projected loss of 200-400 million yuan is mainly due to its filter and SiC businesses.

On one hand, competition in power semiconductors has shifted rapidly from “blue ocean” to “red ocean.” Domestic SiC capacity has exploded, and international giants are slashing prices to defend market share, igniting price wars early. On the other hand, slowing EV sales and automakers shifting to lower-cost hybrid solutions (IGBT + SiC) have led Sanan’s hundreds-of-billion-yuan production lines to face “order shortages.” The high depreciation of semiconductor lines, combined with underutilization, is turning these high-end capacities into “money-consuming black holes” that drag down the balance sheet.

Governance reassessment and liquidity risks, under the absence of the actual controller

In response to market concerns about the detention of the actual controller, Sanan tries to reassure investors by claiming Lin Xiucheng has “retreated behind the scenes for nine years.” Structurally, this is not incorrect. The second-generation leader, Lin Zhiqiang, has long taken over, and a professional management team handles daily operations, with no current production stoppages. But at the control level, Lin Xiucheng remains the shadow figure influencing strategic resources and maintaining billion-yuan government-business collaborations. His sudden absence could increase liquidity and credit default risks.

The high pledge ratio of his equity holdings exemplifies the “large assets, large liabilities” characteristic of his family’s expansion. As of March 2026, the latest announcement shows pledge ratios remain high: 65.99% of Sanan Group’s holdings are pledged, and about 48% of Sanan Electronics’ holdings are pledged, totaling nearly 53%.

With the company’s first loss and the actual controller’s detention, if the stock price continues to fall and breaches margin calls, forced liquidation risks increase. More critically, during detention, Lin Xiucheng cannot sign new pledge agreements or extend existing ones, risking control instability.

Referring to cases like Shanshan Group, where the disappearance or investigation of the actual controller triggers “key person risk” controls by financial institutions, Sanan’s parent company, Sanan Group, could face bank withdrawals, credit cuts, or reduced credit lines. This would threaten its already tight funding chain. During the investigation, refinancing channels via private placements or bonds could be cut off, which would be disastrous for Sanan’s need for capital to support SiC and other new businesses.

Furthermore, Lin Xiucheng’s detention may undermine the political-business trust system he built. His detention could lead local governments to become more conservative or halt subsidy payments and project approvals, and trigger regulatory scrutiny of past fund flows. For example, in 2025, Sanan planned to use funds involving state capital to acquire the bankrupt Lumileds overseas, a transaction with “risk transfer” concerns. Under the current investigation, such deals face high risks of asset loss and regulatory review.

Under the detention of the actual controller, Sanan faces not just industry cycle challenges but a fundamental governance and credit crisis. Over more than a decade of rapid growth driven by extreme political-business leverage, Sanan’s financials have become path-dependent on government subsidies.

Now, with the first-ever profit warning exposed and the actual controller under investigation, Sanan must confront capacity digestion amid industry competition, hundreds of billions in potential state asset impairments, and imminent liquidity tests. Stripped of the “subsidy halo” and “strongman protection,” Sanan’s true technological strength is now subject to dual market and regulatory scrutiny. (Produced by Siwei Finance)■