We are live on ! Find out more
WH

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%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PWR icon
1
Quanta Services
PWR
$96.1B
$3.4B 42.25%
4,720,847
-286,993
-6% -$196M
DY icon
2
Dycom Industries
DY
$11.8B
$2.25B 27.92%
4,443,320
+330,000
+8% +$144M
MTZ icon
3
MasTec
MTZ
$21.4B
$1.53B 19.02%
3,678,431
+100,000
+3% +$38.2M
SPY icon
4
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$809B
$523M 6.5%
+700,000
New +$508M
FCX icon
5
Freeport-McMoran
FCX
$110B
$246M 3.06%
3,917,068
+600,000
+18% +$38.6M
AMC icon
6
AMC Entertainment Holdings
AMC
$2.28B
$60.8M 0.76%
32,000,000
+29,000,000
+967% +$49.9M
CNK icon
7
Cinemark Holdings
CNK
$4.24B
$38.1M 0.47%
1,201,917
+801,917
+200% +$23.8M
GOOGL icon
8
Alphabet (Google) Class A
GOOGL
$4.22T
$643K 0.01%
1,800
– –
AMZN icon
9
Amazon
AMZN
$2.79T
– –
-953,414
Closed -$199M
FSLR icon
10
First Solar
FSLR
$23B
– –
-395,000
Closed -$77.9M

Similar funds

AS
Altshuler Shaham Tel Aviv, Israel $8.04B AUM 44.04% 1-Year Est. Return
EI
Ethic Inc New York $8.02B AUM 45.39% 1-Year Est. Return
CF
Canoe Financial Calgary, Alberta, Canada $8.07B AUM 25.47% 1-Year Est. Return
FPA
First Pacific Advisors El Segundo, California $8.09B AUM 21.95% 1-Year Est. Return
YAM
Yacktman Asset Management Austin, Texas $8.09B AUM 19.03% 1-Year Est. Return
BCWM
Bartlett & Co Wealth Management Cincinnati, Ohio $7.99B AUM 20.76% 1-Year Est. Return
CCM
Coldstream Capital Management Bellevue, Washington $7.99B AUM 24.2% 1-Year Est. Return
PCH
PGIM Custom Harvest Newark, New Jersey $7.98B AUM 28.14% 1-Year Est. Return

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.