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William Harnisch 13F portfolio summary

William Harnisch of PECONIC PARTNERS LLC has 9 current stock holdings with a reported portfolio value of $5.78B. The portfolio 1 year return is +116.86%. Top holdings include PWR (47.56%), DY (24.11%), MTZ (19.92%), AMZN (3.44%), FCX (3.37%).

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William Harnisch

PECONIC PARTNERS LLC
Latest filing: 2026-03-31

William Harnisch runs PECONIC PARTNERS LLC and currently holds 9 stock positions, which is fewer than the average of 496 among the investors we track. The portfolio is valued at approximately $5.78B. Their top 5 holdings are various securities, which collectively represent 0.0% of the portfolio's total weight. William Harnisch ranks #3 out of 75 investors tracked based on their composite Alpha Score. Their current best-performing position is MTZ (MASTEC INC) with returns of +48.01% from their average buy price, held for approximately 3.0 quarters. Over the past year, William Harnisch's portfolio at PECONIC PARTNERS LLC has delivered returns of +116.86%. Their 3-year annualized return is +210.63%. Looking at the 5-year horizon, William Harnisch has achieved +395.00% annualized returns at PECONIC PARTNERS LLC.

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Top 5 Holdings
No holdings data available
Portfolio Returns
1 Year
+116.86%
#3/75
3 Year
+210.63%
#8/75
5 Year
+395.00%
#1/75

Portfolio Value

$5.78B

Alpha Score

246.5

#3 of 75

Holdings

9

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0 stock holdings

HoldingWeightAvg BuyCurrentReturnQuarter Change