Accident at Villa 1 The Billionaire Behind Your Substack Donated $39M to TrumpW. A. Lawrence – “Marc Andreessen’s firm bankrolled Substack and donated $39 million to Trump’s orbit. Its former executives now serve in his administration. If you publish political journalism here, you should know whose roof you’re under. That is the sentence every political writer on Substack needs to sit with, because almost none of them are asking the question underneath it: who invested in the platform where you build your audience, and what are those investors doing with their other hand while you type? The answer is Marc Andreessen, the Silicon Valley billionaire who co-created the first mainstream web browser and now runs Andreessen Horowitz, a venture capital firm known by its shorthand a16z. The implications for independent journalism are far more serious than most people on Substack realize. Here is the money trail. Andreessen’s firm led Substack’s $15.3 million Series A in 2019 and took a seat on the board of directors. The money kept flowing through subsequent rounds, most recently a $100 million Series C in July 2025 that pushed valuation to $1.1 billion. That level of investment buys structural influence over how the entire operation runs. When Substack decides what gets amplified and what quietly languishes, Andreessen’s representative is in the room. That alone would warrant scrutiny, but what Andreessen did next turned scrutiny into alarm…
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