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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
+19.52%
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
$2.07B
AUM Growth
+$308M
Cap. Flow
-$22.3M
Cap. Flow %
-1.08%
Top 10 Hldgs %
99.64%
Holding
44
New
10
Increased
2
Reduced
4
Closed
28

Top Buys

Rank Stock Value
1
MTZ icon
MasTec
MTZ
+$63.7M
2
DY icon
Dycom Industries
DY
+$45.7M
3
ETRN
Equitrans Midstream Corporation Common Stock
ETRN
+$27.2M
4
TWLO icon
Twilio
TWLO
+$6.2M
5
SLAB icon
Silicon Laboratories
SLAB
+$2.27M

Top Sells

Rank Stock Value
1
UBER icon
Uber
UBER
+$66.9M
2
RH icon
RH
RH
+$22.2M
3
SBAC icon
SBA Communications
SBAC
+$16.3M
4
RIOT icon
Riot Platforms
RIOT
+$15M
5
CLF icon
Cleveland-Cliffs
CLF
+$9.16M

Sector Composition

Rank Sector Weight
1 Industrials 94.77%
2 Technology 3.17%
3 Energy 1.87%
4 Healthcare 0.1%
5 Consumer Discretionary 0.07%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PWR icon
1
Quanta Services
PWR
$96.1B
$1.09B 52.46%
5,528,365
-35,000
-0.6% -$6.11M
WCC
2
WESCO International
WCC
$17B
$439M 21.19%
2,450,143
-35,000
-1% -$5.1M
DY icon
3
Dycom Industries
DY
$11.8B
$358M 17.31%
3,152,954
+462,572
+17% +$45.7M
MTZ icon
4
MasTec
MTZ
$21.4B
$76.7M 3.7%
+650,000
New +$63.7M
UBER icon
5
Uber
UBER
$161B
$51M 2.46%
1,180,437
-1,800,000
-60% -$66.9M
ETRN
6
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
$38.7M 1.87%
+4,051,061
New +$27.2M
TWLO icon
7
Twilio
TWLO
$34.6B
$6.68M 0.32%
+105,000
New +$6.2M
SLAB icon
8
Silicon Laboratories
SLAB
$7.27B
$2.37M 0.11%
+15,000
New +$2.27M
POOL icon
9
Pool Corp
POOL
$6.83B
$2.25M 0.11%
+6,000
New +$2.05M
VEEV icon
10
Veeva Systems
VEEV
$40.3B
$1.98M 0.1%
+10,000
New +$1.82M
NET icon
11
Cloudflare
NET
$104B
$1.96M 0.09%
+30,000
New +$1.79M
SHOP icon
12
Shopify
SHOP
$192B
$1.94M 0.09%
30,000
+28,070
+1,454% +$1.59M
ST icon
13
Sensata Technologies
ST
$6.23B
$1.8M 0.09%
+40,000
New +$1.75M
RH icon
14
RH
RH
$2.9B
$989K 0.05%
3,000
-85,100
-97% -$22.2M
LUMN icon
15
Lumen
LUMN
$6.13B
$452K 0.02%
+200,000
New +$440K
AMZN icon
16
Amazon
AMZN
$2.79T
$380K 0.02%
+2,915
New +$333K
AAPL icon
17
Apple
AAPL
$4.51T
– –
-2,200
Closed -$363K
ABBV icon
18
AbbVie
ABBV
$468B
– –
-15,000
Closed -$2.39M
AMR icon
19
Alpha Metallurgical Resources
AMR
$2.66B
– –
-5,000
Closed -$780K
BTU icon
20
Peabody Energy
BTU
$3.37B
– –
-10,000
Closed -$256K
CCI icon
21
Crown Castle
CCI
$32.1B
– –
-4,126
Closed -$552K
CLF icon
22
Cleveland-Cliffs
CLF
$6.43B
– –
-500,000
Closed -$9.16M
CSCO icon
23
Cisco
CSCO
$438B
– –
-40,000
Closed -$2.09M
FANG icon
24
Diamondback Energy
FANG
$59B
– –
-43,360
Closed -$5.86M
FCX icon
25
Freeport-McMoran
FCX
$110B
– –
-215,000
Closed -$8.8M
1
2

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William Harnisch's Q2 2023 Portfolio in Review

As of Q2 2023, William Harnisch held 44 positions worth $2.07B, up 17% from $1.76B the previous quarter. Its ten largest holdings account for 100% of the portfolio.

William Harnisch's Q2 2023 filing shows 10 new, 2 increased, 4 reduced and 28 closed positions. Its largest new stake was MasTec: 650,000 shares worth $76.7M. The largest sale was Uber, an estimated $66.9M.

By sector, the portfolio is most concentrated in Industrials at 95% of assets, up from 89% a quarter earlier, followed by Technology and Energy.

  • William Harnisch's largest Q2 2023 buy was MasTec: 650,000 shares worth $76.7M.
  • William Harnisch added most to Dycom Industries in Q2 2023, an estimated $45.7M increase.
  • William Harnisch's biggest Q2 2023 reduction was Uber, cutting an estimated $66.9M.
  • William Harnisch fully exited SBA Communications in Q2 2023, selling an estimated $16.3M.
  • William Harnisch's ten largest holdings make up 100% of its $2.07B portfolio in Q2 2023.
  • William Harnisch opened 10 new positions and closed 28 in Q2 2023.
  • William Harnisch's portfolio value rose 17% quarter-over-quarter to $2.07B.

Based on Peconic Partners's 13F filing for Q2 2023, filed 14 Aug 2023.