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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
GM icon
26
General Motors
GM
$77.2B
– –
-30,234
Closed -$1.11M
GTLS
27
DELISTED
Chart Industries
GTLS
– –
-5,000
Closed -$627K
HCC icon
28
Warrior Met Coal
HCC
$5.64B
– –
-15,000
Closed -$551K
IDXX icon
29
Idexx Laboratories
IDXX
$43.9B
– –
-440
Closed -$220K
MSFT icon
30
Microsoft
MSFT
$3.59T
– –
-400
Closed -$115K
MTDR icon
31
Matador Resources
MTDR
$7.22B
– –
-10,000
Closed -$477K
NEE icon
32
NextEra Energy
NEE
$174B
– –
-5,200
Closed -$401K
NXPI icon
33
NXP Semiconductors
NXPI
$56.9B
– –
-10,000
Closed -$1.86M
PYPL icon
34
PayPal
PYPL
$52.7B
– –
-1,500
Closed -$114K
RIOT icon
35
Riot Platforms
RIOT
$7.44B
– –
-1,500,000
Closed -$15M
SBAC icon
36
SBA Communications
SBAC
$19.4B
– –
-62,359
Closed -$16.3M
SMG icon
37
ScottsMiracle-Gro
SMG
$3.55B
– –
-50,000
Closed -$3.49M
TECK icon
38
Teck Resources
TECK
$33.9B
– –
-70,000
Closed -$2.56M
VMEO
39
DELISTED
Vimeo
VMEO
– –
-1,786
Closed -$6.84K
XLE icon
40
State Street Energy Select Sector SPDR ETF
XLE
$41.7B
– –
-20,000
Closed -$828K
ZTS icon
41
Zoetis
ZTS
$32.1B
– –
-550
Closed -$91.5K
XIFR
42
XPLR Infrastructure LP
XIFR
$1.05B
– –
-20,000
Closed -$1.22M
DEN
43
DELISTED
Denbury Inc.
DEN
– –
-10,000
Closed -$876K
ARCH
44
DELISTED
Arch Resources, Inc.
ARCH
– –
-5,000
Closed -$657K
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.