TSM VP Tien Bor-Zen bought 2,000 shares for $139,810.00 on 2026-05-19; 5 of 5 prior TSM buys were well-timed at 90-day mark.
Tien Bor-Zen, VP at Taiwan Semiconductor Manufacturing Co Ltd, executed 2 separate purchases totaling 2,000 shares for $139,810.00 at a blended average price of $69.90, increasing holdings by 22.1% to 11,051 shares. His prior trading history at TSM shows a perfect timing pattern: all 5 previous buys at this ticker were well-timed at the 90-day measurement point, with returns ranging from +1.5% to +611.4% over 90 days. This transaction occurs amid a cluster environment where 27 other insiders also bought within the past 14 days. The stock has moved +6.9% over the past 30 days and +8.7% over 90 days, within a 52-week trading range of $187.72–$421.97.
TSM VP Tien Bor-Zen buys 20 shares across 3 transactions totaling $7,760.00 at blended average $388.00
VP Tien Bor-Zen executed 3 separate purchases on 2026-04-28, acquiring a total of 20 shares at prices ranging from $386.00 to $390.00 for a combined $7,760.00, raising his holdings from 70 to 90 shares (+28.6%). The current price of $393.83 sits -2.8% from the 52-week high of $404.98. His cross-ticker track record shows 3 prior buys with an average 30-day return of +558.1%, while his prior trades at TSM include two recent buys on 2026-04-09 with outcomes not yet measurable and one buy on 2026-03-22 that delivered a +558.1% 30-day return. The modest transaction size relative to TSM's market cap of $10,213.0B and the absence of measurable 90-day outcomes on his same-ticker history limit the signal strength of this single-day multi-tranche purchase.
VP Tien Bor-Zen bought 62 shares of TSM at $57.87 in 2 transactions on 2026-04-09; stock at $369.57 amid cluster activity
Tien Bor-Zen, VP at Taiwan Semiconductor Manufacturing Co Ltd, executed 2 separate purchases totaling 62 shares for $3,587.94 at a blended average price of $57.87 on 2026-04-09. The current price of $369.57 is significantly higher than the transaction price, though this reflects the time differential between the dated Form 4 filing (2026-04-09) and the PRICE snapshot, not transaction timing. The filing is part of a broader cluster pattern with 28 other insiders buying within the past 14 days, suggesting coordinated or broadly distributed confidence at that moment. The insider's prior buy at TSM on 2026-03-22 has not yet reached the 90-day measurement window, limiting ability to assess pattern consistency; across all open-market activity, this insider has 1 prior buy on record, providing minimal historical context for this transaction.
VP Tien Bor-Zen buys 1,000 TSM shares at $55.93; stock now at $343.25, up 14.9% over 90 days
Vice President Tien Bor-Zen purchased 1,000 shares of TSM at $55.93 on March 22, 2026, increasing holdings to 9,051 shares. The transaction occurs in a context of significant stock appreciation: the current price of $343.25 represents a 14.9% gain over the prior 90 days, though the stock has pulled back 7.4% in the past 30 days and trades 11.5% below its 52-week high of $387.73. The purchase adds modestly to holdings (a 12.4% increase from 8,051 shares), which in isolation reflects routine portfolio activity rather than concentrated accumulation. For a company with an $8,901.4B market capitalization, this transaction represents a small position adjustment by a single VP-level executive.
