What began as a teenage programming partnership at Lakeside turned, by the early 1980s, into one of the most consequential and tense business relationships in American tech history. After co‑founding Microsoft in 1975, Paul Allen moved away from day‑to‑day operations in early 1983 following a Hodgkin's lymphoma diagnosis but remained vice‑chairman of the company. As Microsoft grew into a high‑stakes enterprise, Bill Gates increasingly argued that he was doing the lion's share of the technical work. According to Allen's account and contemporaneous reporting, Gates pushed for a reallocation of ownership to reflect that imbalance—initially asking for a 60–40 split in his favor, then quietly renogotiating the terms to 64–36. The situation escalated when, in 1983, Gates reportedly tried to buy Allen out at $5 a share. Allen refused, choosing to keep his holdings intact. When Microsoft went public in 1986, Allen's retained stake — roughly 25.2% — vaulted him into billionaire status almost overnight.
The negotiation left a durable scar. For years it fed rumors about personal animosity and power plays between the two founders, and it shaped public perceptions of Gates as the aggressive steward of Microsoft and Allen as the sidelined co‑founder who had been asked to cash out. The two men publicly repaired their relationship later in the decade — making joint philanthropic gifts, including a 1986 donation to Lakeside School — and remained on speaking terms for the rest of Allen's life. But historians and contemporaries still point to the 1982–1986 share wrangling as a pivotal episode that determined control, wealth distribution, and the personal legacy of Microsoft's founding duo.
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