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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
+19.21%
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
$2.08B
AUM Growth
+$367M
Cap. Flow
+$40.2M
Cap. Flow %
1.93%
Top 10 Hldgs %
100%
Holding
11
New
3
Increased
3
Reduced
1
Closed
2

Top Buys

Rank Stock Value
1
CLF icon
Cleveland-Cliffs
CLF
+$35.5M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$13.4M
3
AMZN icon
Amazon
AMZN
+$9.11M
4
MU icon
Micron Technology
MU
+$7.43M
5
CNK icon
Cinemark Holdings
CNK
+$3.11M

Top Sells

Rank Stock Value
1
MTZ icon
MasTec
MTZ
+$21.7M
2
UBER icon
Uber
UBER
+$5.23M
3
SG icon
Sweetgreen
SG
+$3.52M

Sector Composition

Rank Sector Weight
1 Industrials 95.77%
2 Materials 2.03%
3 Communication Services 1.01%
4 Consumer Discretionary 0.75%
5 Technology 0.44%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PWR icon
1
Quanta Services
PWR
$96.1B
$1.19B 57.27%
5,528,365
– –
WCC
2
WESCO International
WCC
$17B
$426M 20.45%
2,450,348
– –
DY icon
3
Dycom Industries
DY
$11.8B
$376M 18.04%
3,265,682
+21,635
+0.7% +$2.05M
CLF icon
4
Cleveland-Cliffs
CLF
$6.43B
$42.4M 2.03%
+2,074,927
New +$35.5M
AMZN icon
5
Amazon
AMZN
$2.79T
$15.6M 0.75%
102,915
+65,000
+171% +$9.11M
GOOGL icon
6
Alphabet (Google) Class A
GOOGL
$4.22T
$14M 0.67%
+100,000
New +$13.4M
MU icon
7
Micron Technology
MU
$1.09T
$8.53M 0.41%
+100,000
New +$7.43M
CNK icon
8
Cinemark Holdings
CNK
$4.24B
$7.04M 0.34%
500,000
+200,000
+67% +$3.11M
UBER icon
9
Uber
UBER
$161B
$636K 0.03%
10,330
-100,000
-91% -$5.23M
MTZ icon
10
MasTec
MTZ
$21.4B
– –
-301,047
Closed -$21.7M
SG icon
11
Sweetgreen
SG
$832M
– –
-300,000
Closed -$3.52M

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William Harnisch's Q4 2023 Portfolio in Review

As of Q4 2023, William Harnisch held 11 positions worth $2.08B, up 21% from $1.72B the previous quarter. Its ten largest holdings account for 100% of the portfolio.

William Harnisch's Q4 2023 filing shows 3 new, 3 increased, 1 reduced and 2 closed positions. Its largest new stake was Cleveland-Cliffs: 2,074,927 shares worth $42.4M. The largest sale was MasTec, an estimated $21.7M.

By sector, the portfolio is most concentrated in Industrials at 96% of assets, down from 99% a quarter earlier, followed by Materials and Communication Services.

  • William Harnisch's largest Q4 2023 buy was Cleveland-Cliffs: 2,074,927 shares worth $42.4M.
  • William Harnisch added most to Amazon in Q4 2023, an estimated $9.11M increase.
  • William Harnisch's biggest Q4 2023 reduction was Uber, cutting an estimated $5.23M.
  • William Harnisch fully exited MasTec in Q4 2023, selling an estimated $21.7M.
  • William Harnisch's ten largest holdings make up 100% of its $2.08B portfolio in Q4 2023.
  • William Harnisch opened 3 new positions and closed 2 in Q4 2023.
  • William Harnisch's portfolio value rose 21% quarter-over-quarter to $2.08B.

Based on Peconic Partners's 13F filing for Q4 2023, filed 14 Feb 2024.