CenterBook Partners Portfolio holdings
CenterBook Partners is a hedge fund firm that borrows ideas from independent fund managers and builds one long/short portfolio from them centrally. David Stemerman, its co-founder, chief executive and chief investment officer, previously founded Conatus Capital, a long/short stock fund manager. Cameron Hight, another co-founder, chairs its executive board. Its two strategies are equity market neutral and active extension, and orders are entered automatically from computer-generated trading models. Its funds are offered mainly to institutional investors and financially sophisticated high net worth individuals.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$29.4M |
| 2 |
Mastercard
MA
|
+$25.5M |
| 3 |
Lumentum
LITE
|
+$21.1M |
| 4 |
SpaceX
SPCX
|
+$20.5M |
| 5 |
Palantir
PLTR
|
+$18.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Applied Materials
AMAT
|
+$25.1M |
| 2 |
Advanced Micro Devices
AMD
|
+$22.9M |
| 3 |
Amphenol
APH
|
+$21.3M |
| 4 |
Xometry
XMTR
|
+$19.3M |
| 5 |
MongoDB
MDB
|
+$19.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 28.3% |
| 2 | Healthcare | 14.79% |
| 3 | Industrials | 13.6% |
| 4 | Communication Services | 10.03% |
| 5 | Financials | 9.92% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1
Amazon
AMZN
$2.63T
| $50M | 2.46% |
209,763
+32,091
| +18% | +$8.06M |
2021 Q4
18 quarters
|
|
2
Alphabet (Google) Class A
GOOGL
$3.47T
| $45.8M | 2.25% |
128,118
-1,983
| -2% | -$714K |
2021 Q4
18 quarters
|
|
3
Meta Platforms (Facebook)
META
$1.63T
| $42.7M | 2.1% |
75,888
+14,173
| +23% | +$8.67M |
2021 Q4
18 quarters
|
|
4
Microsoft
MSFT
$3.94T
| $39.1M | 1.92% |
104,729
-235
| -0.2% | -$95.1K |
2021 Q4
18 quarters
|
|
5
NVIDIA
NVDA
$5.16T
| $35.7M | 1.75% |
178,482
+28,946
| +19% | +$5.95M |
2024 Q3
7 quarters
|
|
6
TSMC
TSM
$2.24T
| $34.2M | 1.68% |
71,595
-10,979
| -13% | -$4.46M |
2024 Q3
7 quarters
|
|
7
Visa
V
$767B
| $33.3M | 1.64% |
97,160
+18,091
| +23% | +$5.81M |
2021 Q4
18 quarters
|
|
8
Texas Instruments
TXN
$286B
| $30.3M | 1.49% |
101,724
+63,152
| +164% | +$17.5M |
2024 Q3
7 quarters
|
|
9
Apple
AAPL
$5.09T
| $28.4M | 1.39% |
98,050
+9,592
| +11% | +$2.74M |
2024 Q1
9 quarters
|
|
10
Berkshire Hathaway Class B
BRK.B
$1.16T
| $28.1M | 1.38% |
56,229
+7,107
| +14% | +$3.42M |
2024 Q3
7 quarters
|
|
11
Eli Lilly
LLY
$1.22T
| $27.7M | 1.36% |
23,135
-6,121
| -21% | -$6.25M |
2025 Q4
2 quarters
|
|
|
12
Mastercard
MA
$557B
| $26.3M | 1.29% |
+51,161
| New | +$25.5M |
2026 Q2
0 quarters
|
|
13
Broadcom
AVGO
$1.65T
| $25.9M | 1.27% |
68,476
+4,419
| +7% | +$1.77M |
2026 Q1
1 quarter
|
|
|
14
Netflix
NFLX
$258B
| $25.4M | 1.25% |
355,147
+334,365
| +1,609% | +$29.4M |
2021 Q4
18 quarters
|
|
15
BioNTech
BNTX
$22.4B
| $23.4M | 1.15% |
251,083
+79,917
| +47% | +$7.52M |
2024 Q2
8 quarters
|
|
16
JPMorgan Chase
JPM
$912B
| $22.6M | 1.11% |
68,940
+1,330
| +2% | +$413K |
2026 Q1
1 quarter
|
|
|
17
Lumentum
LITE
$83.3B
| $21.6M | 1.06% |
25,152
+23,667
| +1,594% | +$21.1M |
2025 Q4
2 quarters
|
|
|
18
Advanced Micro Devices
AMD
$925B
| $21.1M | 1.04% |
36,321
-55,792
| -61% | -$22.9M |
2025 Q2
4 quarters
|
|
|
19
SpaceX
SPCX
$1.95T
| $20.7M | 1.01% |
+120,871
| New | +$20.5M |
2026 Q2
0 quarters
|
|
20
Micron Technology
MU
$1.06T
| $17.5M | 0.86% |
15,198
+9,929
| +188% | +$7.45M |
2026 Q1
1 quarter
|
|
|
21
Palantir
PLTR
$472B
| $15.8M | 0.77% |
+135,093
| New | +$18.4M |
2026 Q2
0 quarters
|
|
22
PowerFleet Inc
AIOT
$384M
| $15.7M | 0.77% |
4,107,647
+666,124
| +19% | +$2.34M |
2024 Q2
8 quarters
|
|
23
FTAI Aviation
FTAI
$20.1B
| $14.9M | 0.73% |
55,079
+21,642
| +65% | +$5.44M |
2026 Q1
1 quarter
|
|
24
EchoStar
ECHO
$28.4B
| $13.7M | 0.67% |
135,076
+122,692
| +991% | +$15M |
2025 Q3
3 quarters
|
|
25
USA Today Co
TDAY
$909M
| $13.6M | 0.67% |
+1,589,163
| New | +$12M |
2026 Q2
0 quarters
|
|
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CenterBook Partners's Q2 2026 Portfolio in Review
As of Q2 2026, CenterBook Partners held 906 positions worth $2.04B, up 9.4% from $1.86B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
CenterBook Partners withdrew a net $93.1M in Q2 2026, closing 213 positions and reducing 244 holdings. Its most notable exit was Home Depot, an estimated $13.4M position sold in full.
By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 26% a quarter earlier, followed by Healthcare and Industrials.
Against the trend, CenterBook Partners opened a new position in Mastercard worth $26.3M.
- CenterBook Partners's largest Q2 2026 buy was Mastercard: 51,161 shares worth $26.3M.
- CenterBook Partners added most to Netflix in Q2 2026, an estimated $29.4M increase.
- CenterBook Partners's biggest Q2 2026 reduction was Applied Materials, cutting an estimated $25.1M.
- CenterBook Partners fully exited Home Depot in Q2 2026, selling an estimated $13.4M.
- CenterBook Partners's ten largest holdings make up 18% of its $2.04B portfolio in Q2 2026.
- CenterBook Partners opened 278 new positions and closed 213 in Q2 2026.
- CenterBook Partners's portfolio value rose 9.4% quarter-over-quarter to $2.04B.
Based on CenterBook Partners's 13F filing for Q2 2026, filed 11 Aug 2026.