John Overdeck Two Sigma Investments
John Overdeck is a co-founder of Two Sigma Investments, one of the world’s leading quantitative and technology-driven investment firms. Two Sigma applies data science, machine learning, and large-scale computing to markets across asset classes. Overdeck’s firm is a central reference point in discussions of modern systematic investing.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Expanded Tech-Software Sector ETF
IGV
|
+$312M |
| 2 |
UnitedHealth
UNH
|
+$286M |
| 3 |
Duolingo
DUOL
|
+$247M |
| 4 |
Aon
AON
|
+$226M |
| 5 |
Chubb
CB
|
+$221M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$338M |
| 2 |
Marvell Technology
MRVL
|
+$241M |
| 3 |
Advanced Micro Devices
AMD
|
+$240M |
| 4 |
ServiceNow
NOW
|
+$203M |
| 5 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$193M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 16.79% |
| 2 | Financials | 14.46% |
| 3 | Healthcare | 12.9% |
| 4 | Consumer Discretionary | 8.97% |
| 5 | Industrials | 8.82% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1451
Acadia Healthcare
ACHC
$2.66B
| $3.2M | 0.01% |
141,182
-37,585
| -21% | -$891K |
|
1452
TAT Technologies
TATT
$496M
| $3.2M | 0.01% |
+104,650
| New | +$3.01M |
|
1453
Invesco KBW Bank ETF
KBWB
$6.8B
| $3.19M | 0.01% |
+44,600
| New | +$2.83M |
|
1454
Caleres
CAL
$450M
| $3.19M | 0.01% |
+261,274
| New | +$3.92M |
|
1455
Vitamin Cottage Natural Grocers
NGVC
$662M
| $3.19M | 0.01% |
81,297
+64,108
| +373% | +$2.97M |
|
1456
Automatic Data Processing
ADP
$111B
| $3.18M | 0.01% |
10,300
-78,692
| -88% | -$24.2M |
|
1457
Nordic American Tanker
NAT
$1.46B
| $3.17M | 0.01% |
1,204,839
-1,146,657
| -49% | -$2.99M |
|
|
TBRG
1458
DELISTED
TruBridge
TBRG
| $3.16M | 0.01% |
134,960
+71,225
| +112% | +$1.75M |
|
1459
TJX Companies
TJX
$156B
| $3.16M | 0.01% |
25,587
-151,891
| -86% | -$19.3M |
|
1460
Scholastic
SCHL
$761M
| $3.16M | 0.01% |
150,391
+6,438
| +4% | +$117K |
|
1461
Service Corp International
SCI
$11.4B
| $3.15M | 0.01% |
38,702
-208,577
| -84% | -$16.3M |
|
|
SMLR
1462
DELISTED
Semler Scientific
SMLR
| $3.13M | 0.01% |
80,780
+55,875
| +224% | +$1.99M |
|
1463
A.O. Smith
AOS
$8.52B
| $3.12M | 0.01% |
47,636
+41,781
| +714% | +$2.73M |
|
1464
Exelon
EXC
$45.4B
| $3.12M | 0.01% |
71,800
-12,800
| -15% | -$570K |
|
|
GDEN
1465
DELISTED
Golden Entertainment
GDEN
| $3.1M | 0.01% |
105,474
+65,117
| +161% | +$1.77M |
|
1466
Telkom Indonesia
TLK
$14.8B
| $3.1M | 0.01% |
182,980
-23,639
| -11% | -$379K |
|
|
SPTN
1467
DELISTED
SpartanNash
SPTN
| $3.09M | 0.01% |
116,492
-91,133
| -44% | -$1.82M |
|
|
CBLL
1468
CeriBell Inc
CBLL
$921M
| $3.08M | 0.01% |
+164,639
| New | +$2.8M |
|
1469
Renasant Corp
RNST
$3.77B
| $3.08M | 0.01% |
85,816
-93,172
| -52% | -$3.11M |
|
|
CWAN
1470
DELISTED
Clearwater Analytics
CWAN
| $3.08M | 0.01% |
140,540
-183,088
| -57% | -$4.21M |
|
1471
SandRidge Energy
SD
$516M
| $3.08M | 0.01% |
284,586
+110,316
| +63% | +$1.12M |
|
1472
Vail Resorts
MTN
$5.25B
| $3.08M | 0.01% |
+19,591
| New | +$2.91M |
|
1473
CareDx
CDNA
$2.45B
| $3.06M | 0.01% |
156,614
-165,292
| -51% | -$2.94M |
|
1474
Eton Pharmaceutcials
ETON
$1.86B
| $3.06M | 0.01% |
214,552
+132,197
| +161% | +$2.09M |
|
1475
ARK Genomic Revolution ETF
ARKG
$1.9B
| $3.05M | 0.01% |
+125,200
| New | +$2.74M |
|
Similar funds
John Overdeck's Q2 2025 Portfolio in Review
As of Q2 2025, John Overdeck held 3,681 positions worth $56.5B, up 21% from $46.8B the previous quarter. Its ten largest holdings account for 7.7% of the portfolio.
John Overdeck deployed $2.96B of net new capital in Q2 2025, opening 509 new positions and adding to 1,200 existing holdings. Its largest new stake was iShares Expanded Tech-Software Sector ETF: 3,154,300 shares worth $345M.
By sector, the portfolio is most concentrated in Technology at 17% of assets, down from 18% a quarter earlier, followed by Financials and Healthcare.
On the sell side, the largest reduction was Broadcom, an estimated $338M trimmed.
- John Overdeck's largest Q2 2025 buy was iShares Expanded Tech-Software Sector ETF: 3,154,300 shares worth $345M.
- John Overdeck added most to UnitedHealth in Q2 2025, an estimated $286M increase.
- John Overdeck's biggest Q2 2025 reduction was Broadcom, cutting an estimated $338M.
- John Overdeck fully exited State Street Utilities Select Sector SPDR ETF in Q2 2025, selling an estimated $134M.
- John Overdeck's ten largest holdings make up 7.7% of its $56.5B portfolio in Q2 2025.
- John Overdeck opened 509 new positions and closed 531 in Q2 2025.
- John Overdeck's portfolio value rose 21% quarter-over-quarter to $56.5B.
Based on Two Sigma Investments's 13F filing for Q2 2025, filed 14 Aug 2025.