William Harnisch Peconic Partners
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Quanta Services
PWR
|
+$28.6M |
| 2 |
Array Technologies
ARRY
|
+$15.5M |
| 3 |
Dycom Industries
DY
|
+$10.1M |
| 4 |
Caesars Entertainment
CZR
|
+$9.76M |
| 5 |
Shoals Technologies Group
SHLS
|
+$748K |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Uber
UBER
|
+$36.2M |
| 2 |
Comcast
CMCSA
|
+$33.8M |
| 3 |
Vistra
VST
|
+$30.3M |
| 4 |
EQT Corp
EQT
|
+$18.4M |
| 5 |
Nextpower Inc
NXT
|
+$13.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Industrials | 97.66% |
| 2 | Technology | 1.25% |
| 3 | Consumer Discretionary | 1.07% |
| 4 | Utilities | 0.02% |
| 5 | Energy | 0% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Quanta Services
PWR
$96.1B
| $1.35B | 68.77% |
5,297,565
+99,000
| +2% | +$28.6M |
|
|
2
Dycom Industries
DY
$11.8B
| $566M | 28.88% |
3,712,239
+58,747
| +2% | +$10.1M |
|
|
3
Caesars Entertainment
CZR
$6.06B
| $20.1M | 1.03% |
804,844
+300,000
| +59% | +$9.76M |
|
|
4
Shoals Technologies Group
SHLS
$1.19B
| $12.9M | 0.66% |
3,880,000
+180,000
| +5% | +$748K |
|
|
5
Array Technologies
ARRY
$722M
| $11.7M | 0.6% |
+2,400,000
| New | +$15.5M |
|
6
Amazon
AMZN
$2.79T
| $757K | 0.04% |
3,980
| – | – |
|
7
NextEra Energy
NEE
$174B
| $460K | 0.02% |
6,485
| – | – |
|
|
8
Comcast
CMCSA
$95.3B
| – | – |
-900,000
| Closed | -$33.8M |
|
|
9
EQT Corp
EQT
$33.6B
| – | – |
-400,000
| Closed | -$18.4M |
|
10
Newell Brands
NWL
$2.59B
| – | – |
-1,000,000
| Closed | -$9.96M |
|
|
11
Nextpower Inc
NXT
$13.1B
| – | – |
-380,000
| Closed | -$13.9M |
|
|
12
Uber
UBER
$161B
| – | – |
-600,000
| Closed | -$36.2M |
|
|
13
Vistra
VST
$45.7B
| – | – |
-220,000
| Closed | -$30.3M |
|
Similar funds
William Harnisch's Q1 2025 Portfolio in Review
As of Q1 2025, William Harnisch held 13 positions worth $1.96B, down 20% from $2.46B the previous quarter. Its ten largest holdings account for 100% of the portfolio.
William Harnisch withdrew a net $77.9M in Q1 2025, closing 6 positions. Its most notable exit was Uber, an estimated $36.2M position sold in full.
By sector, the portfolio is most concentrated in Industrials at 98% of assets, up from 93% a quarter earlier, followed by Technology and Consumer Discretionary.
Against the trend, William Harnisch opened a new position in Array Technologies worth $11.7M.
- William Harnisch's largest Q1 2025 buy was Array Technologies: 2,400,000 shares worth $11.7M.
- William Harnisch added most to Quanta Services in Q1 2025, an estimated $28.6M increase.
- William Harnisch fully exited Uber in Q1 2025, selling an estimated $36.2M.
- William Harnisch's ten largest holdings make up 100% of its $1.96B portfolio in Q1 2025.
- William Harnisch opened 1 new position and closed 6 in Q1 2025.
- William Harnisch's portfolio value fell 20% quarter-over-quarter to $1.96B.
Based on Peconic Partners's 13F filing for Q1 2025, filed 15 May 2025.