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William Harnisch Peconic Partners

AUM $8.04B
1-Year Est. Return 107.18%
 

William Harnisch is the founder of Peconic Partners, a concentrated investment firm known for high-conviction equity positions. The firm’s portfolio often differs sharply from broad market benchmarks, reflecting a willingness to concentrate capital. Harnisch’s disclosures are tracked by investors interested in bold, research-driven concentration.

This Fund
S&P 500
This Quarter Est. Return
+35.79%
1 Year Est. Return
+107.18%
3 Year Est. Return
+300.02%
5 Year Est. Return
+691.8%
10 Year Est. Return
+3,202.62%
AUM
$8.04B
AUM Growth
+$2.26B
Cap. Flow
+$330M
Cap. Flow %
4.1%
Top 10 Hldgs %
100%
Holding
10
New
1
Increased
5
Reduced
1
Closed
2

Top Buys

Rank Stock Value
1
DY icon
Dycom Industries
DY
+$144M
2
AMC icon
AMC Entertainment Holdings
AMC
+$49.9M
3
FCX icon
Freeport-McMoran
FCX
+$38.6M
4
MTZ icon
MasTec
MTZ
+$38.2M
5
CNK icon
Cinemark Holdings
CNK
+$23.8M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$199M
2
PWR icon
Quanta Services
PWR
+$196M
3
FSLR icon
First Solar
FSLR
+$77.9M

Sector Composition

Rank Sector Weight
1 Industrials 89.2%
2 Materials 3.06%
3 Communication Services 1.24%
4 Consumer Discretionary 0%
5 Technology 0%

No holdings matched the selected filter criteria.

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William Harnisch's Q2 2026 Portfolio in Review

As of Q2 2026, William Harnisch held 10 positions worth $8.04B, up 39% from $5.78B the previous quarter. Its ten largest holdings account for 100% of the portfolio.

William Harnisch deployed $330M of net new capital in Q2 2026, opening 1 new position and adding to 5 existing holdings.

By sector, the portfolio is most concentrated in Industrials at 89% of assets, down from 92% a quarter earlier, followed by Materials and Communication Services.

On the sell side, the largest reduction was Quanta Services, an estimated $196M trimmed.

  • William Harnisch added most to Dycom Industries in Q2 2026, an estimated $144M increase.
  • William Harnisch's biggest Q2 2026 reduction was Quanta Services, cutting an estimated $196M.
  • William Harnisch fully exited Amazon in Q2 2026, selling an estimated $199M.
  • William Harnisch's ten largest holdings make up 100% of its $8.04B portfolio in Q2 2026.
  • William Harnisch opened 1 new position and closed 2 in Q2 2026.
  • William Harnisch's portfolio value rose 39% quarter-over-quarter to $8.04B.

Based on Peconic Partners's 13F filing for Q2 2026, filed 14 Aug 2026.