The Nuremberg native brings over three decades of capital markets experience, backed by a career shaped by deep market insight and a genuine passion for investing. His journey began in 1994 through an investment club among colleagues – a formative experience that sparked a lifelong dedication to identifying compelling investment opportunities.
Following senior editorial roles at Nürnberger Nachrichten, €uro am Sonntag, and €uro, he went on to serve as Editor-in-Chief of the renowned investor magazine Börse Online from 2014, where he played a key role in shaping high-quality financial journalism for a broad investor audience.
Since April 2026, he has been operating independently, fully focused on his core strength: uncovering mispriced equities with significant upside potential – particularly within the small- and mid-cap segment, where inefficiencies create attractive opportunities for discerning investors.
Throughout his career, he has engaged with some of the most influential minds in global finance, including Warren Buffett, Charlie Munger, Jim Rogers, and George Soros. The unique insights gained from these conversations continue to inform his analytical perspective today. As a dedicated value investor, he is committed to translating complex market dynamics into clear, actionable ideas – empowering investors to make better-informed decisions.
Commented by Jens Castner
Commented by Jens Castner on April 23rd, 2026 | 07:50 CEST
THE PENNY STOCK, THE BAKER, AND THE FLOUR SUPPLIER: HPQ SILICON, IBU-TEC, AND AMG CRITICAL MATERIALS ARE SHAKING UP THE BATTERY MARKET
China's dominance in batteries for electric vehicles is a cause for concern among Western politicians. In their speeches, they regularly promise to reduce dependence on Beijing. Little has happened so far. But the tide is slowly turning—though those in power are playing more of a supporting role. The key players work for publicly traded companies like HPQ Silicon, IBU-tec, and AMG Critical Materials. We take a look at how this trio plans to make Europe's battery industry competitive.
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Commented by Jens Castner on April 21st, 2026 | 07:20 CEST
GOLD RUSH IN WEST AFRICA: HOW DESERT GOLD VENTURES, THOR EXPLORATIONS, AND ZIJIN MINING ARE BENEFITING
Due to high gold prices, West Africa is increasingly attracting investor attention as one of the world's most productive mining regions. Chinese giant Zijin Mining is doing everything in its power to catch up with the market leaders, but faces growing political hurdles. At the same time, Thor Explorations is demonstrating how to successfully establish itself as a highly efficient cash cow, while its much smaller competitor, Desert Gold Ventures, is on the verge of making the leap from explorer to producer.
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Commented by Jens Castner on April 20th, 2026 | 08:45 CEST
AMAZON, ALMONTY, AND VEOLIA ON A ROLLERCOASTER RIDE: BACK ON TRACK TO RECORD HIGHS AFTER THE CORRECTION
Fear and panic spread across the stock market in March. Even giants began to waver. But after a brief, albeit sharp, correction, the shares of the world's leading online retailer, Amazon, the commodities rebel Almonty, and the environmental pioneer Veolia are once again on the rise. A rollercoaster ride that may test your nerves, but teaches us once again: those declared dead live longer—and quality stocks often fall only to gather momentum for the next push toward their former highs.
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Commented by Jens Castner on April 14th, 2026 | 07:20 CEST
GOLD WITH A CLEAR CONSCIENCE: WHY B2GOLD, KOBO RESOURCES, AND PERSEUS MINING ARE WORTH A LOOK RIGHT NOW
Although the price of gold has fallen since its all-time high of over USD 5,500, the structural drivers of the boom, over-indebted nations, geopolitical turmoil, and massive central bank purchases, remain in place. However, those looking to profit from the gold rush through mining stocks don't have to invest in companies that accept environmental destruction and exploitation. Canadian producer B2Gold has demonstrated for years that responsible mining and cost efficiency are not mutually exclusive. Its Australian industry peer, Perseus Mining, operates sustainable mines in Africa with production costs amounting to less than a third of the current gold price. And the debt-free junior exploration company Kobo Resources is on the verge of its next major gold discovery in the Kossou Basin of Côte d'Ivoire, in the immediate vicinity of an existing Perseus mine.
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Commented by Jens Castner on April 10th, 2026 | 08:15 CEST
Between Hubris, Hype, and Hardship: A.H.T. Syngas, 2G Energy, and SFC Energy in the Cleantech Battle
At a time when Donald Trump’s return to the White House is fueling the fossil fuel industry, innovative cleantech companies are vying for attention and investors. A.H.T. Syngas, 2G Energy, and SFC Energy embody the shift toward clean, decentralized energy supply—from hydrogen derived from waste to flexible fuel cells. On the stock market, these small-cap stocks are currently struggling, while defense stocks are riding high. But the rediscovery of sustainable business models is only a matter of time.
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Commented by Jens Castner on April 8th, 2026 | 08:10 CEST
YELLOW CAKE, KAZATOMPROM, AND STALLION URANIUM: THREE WAYS TO PLAY THE URANIUM BOOM
Nuclear power is poised for a boom worldwide. This promises bright prospects for the uranium market. What seemed politically dead is being mercilessly disproved by the reality of exploding energy demand for artificial intelligence and data centers. The price of uranium has more than tripled since 2016, and experts see further potential. For investors, there are three interesting but very different investment opportunities: from the solid stockpiler Yellow Cake to the global market leader Kazatomprom to the promising challenger Stallion Uranium.
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Commented by Jens Castner on April 2nd, 2026 | 10:50 CEST
Green Promises, Yellow Solutions: KWS Saat, MustGrow Biologics, and Corteva Under the Microscope
Greenwashing or Genuine Innovation? The debate over sustainable investments hits few industries as hard as agrochemicals. Companies like Corteva, KWS Saat, and MustGrow Biologics are working on technologies that have the potential to fundamentally transform agriculture. Whether through genetically optimized crops or natural mustard extracts: the race for more efficient and environmentally friendly farming methods is in full swing. This opens up exciting opportunities for investors.
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