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 | |
|---|---|---|---|---|---|---|
1201
VeriSign
VRSN
$26.3B
| $4.61M | 0.01% |
15,951
-33,081
| -67% | -$8.96M |
|
1202
PagerDuty
PD
$956M
| $4.6M | 0.01% |
301,220
-109,336
| -27% | -$1.7M |
|
|
GSHR
1203
Gesher Acquisition Corp II
GSHR
$216M
| $4.6M | 0.01% |
+453,124
| New | +$4.55M |
|
1204
Selective Insurance
SIGI
$5.52B
| $4.59M | 0.01% |
52,962
+18,489
| +54% | +$1.62M |
|
|
MCGAU
1205
Yorkville Acquisition Corp Unit
MCGAU
$160M
| $4.59M | 0.01% |
+407,812
| New | +$4.51M |
|
|
OACC
1206
Oaktree Acquisition Corp III Life Sciences
OACC
$264M
| $4.57M | 0.01% |
437,500
| – | – |
|
1207
Aspen Aerogels
ASPN
$416M
| $4.57M | 0.01% |
771,307
-130,177
| -14% | -$749K |
|
|
CCAQ
1208
Collective Acquisition Corp
CCAQ
| $4.55M | 0.01% |
+453,124
| New | +$4.55M |
|
1209
Kiniksa Pharmaceuticals
KNSA
$6.19B
| $4.53M | 0.01% |
+163,740
| New | +$4.17M |
|
1210
First Financial Bankshares
FFIN
$4.87B
| $4.52M | 0.01% |
125,714
-39,436
| -24% | -$1.37M |
|
|
BDN
1211
Brandywine Realty Trust
BDN
$548M
| $4.51M | 0.01% |
1,052,154
+301,023
| +40% | +$1.25M |
|
1212
IBEX
IBEX
$493M
| $4.51M | 0.01% |
155,013
+12,052
| +8% | +$322K |
|
1213
American Superconductor
AMSC
$1.4B
| $4.51M | 0.01% |
122,850
+79,493
| +183% | +$1.95M |
|
|
SVM
1214
Silvercorp Metals
SVM
$2.8B
| $4.5M | 0.01% |
1,065,633
-819,089
| -43% | -$3.17M |
|
|
PARA
1215
DELISTED
Paramount Global Class B
PARA
| $4.49M | 0.01% |
348,350
-1,551,480
| -82% | -$18.2M |
|
1216
Capital One
COF
$133B
| $4.48M | 0.01% |
21,072
+1,510
| +8% | +$282K |
|
1217
Corcept Therapeutics
CORT
$13.3B
| $4.47M | 0.01% |
60,844
-119,305
| -66% | -$8.65M |
|
1218
FNB Corp
FNB
$6.58B
| $4.46M | 0.01% |
305,914
-246,379
| -45% | -$3.33M |
|
1219
Ball Corp
BALL
$17.1B
| $4.45M | 0.01% |
79,363
-325,889
| -80% | -$17M |
|
|
HOLX
1220
DELISTED
Hologic
HOLX
| $4.45M | 0.01% |
+68,296
| New | +$4.09M |
|
|
XYZ
1221
Block Inc
XYZ
$48.9B
| $4.44M | 0.01% |
65,400
+57,954
| +778% | +$3.37M |
|
1222
Sasol
SSL
$7.87B
| $4.44M | 0.01% |
1,004,589
-510,790
| -34% | -$2.09M |
|
1223
Privia Health
PRVA
$2.68B
| $4.44M | 0.01% |
192,928
+3,823
| +2% | +$88.5K |
|
1224
Certara
CERT
$1.21B
| $4.44M | 0.01% |
379,247
+178,800
| +89% | +$2.12M |
|
1225
Marqeta
MQ
$1.7B
| $4.44M | 0.01% |
190,207
-523,067
| -73% | -$9.93M |
|
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.