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 | |
|---|---|---|---|---|---|---|
26
Thermo Fisher Scientific
TMO
$233B
| $258M | 0.46% |
637,117
+305,856
| +92% | +$128M |
|
27
Zscaler
ZS
$29.4B
| $255M | 0.45% |
812,308
+579,991
| +250% | +$145M |
|
28
MSCI
MSCI
$41B
| $252M | 0.45% |
436,842
+15,193
| +4% | +$8.41M |
|
29
Atlassian
TEAM
$43.5B
| $252M | 0.45% |
1,239,975
+609,176
| +97% | +$127M |
|
30
Alphabet (Google) Class A
GOOGL
$4.22T
| $251M | 0.44% |
1,422,143
-167,120
| -11% | -$27.4M |
|
31
T-Mobile US
TMUS
$196B
| $244M | 0.43% |
1,024,186
+800,200
| +357% | +$195M |
|
32
GE Vernova
GEV
$255B
| $243M | 0.43% |
459,054
+435,816
| +1,875% | +$181M |
|
33
Bank of America
BAC
$431B
| $238M | 0.42% |
5,031,873
+3,451,423
| +218% | +$145M |
|
34
Motorola Solutions
MSI
$79.5B
| $237M | 0.42% |
563,990
+209,898
| +59% | +$87.8M |
|
|
35
UnitedHealth
UNH
$350B
| $236M | 0.42% |
756,506
+748,406
| +9,240% | +$286M |
|
36
Danaher
DHR
$154B
| $235M | 0.42% |
1,189,679
+84,078
| +8% | +$16.3M |
|
|
37
Duolingo
DUOL
$6.84B
| $235M | 0.42% |
572,841
+562,685
| +5,540% | +$247M |
|
38
Union Pacific
UNP
$183B
| $235M | 0.42% |
1,019,532
+944,994
| +1,268% | +$210M |
|
39
Costco
COST
$420B
| $232M | 0.41% |
234,117
+111,097
| +90% | +$110M |
|
40
Republic Services
RSG
$67.6B
| $232M | 0.41% |
939,170
+414,484
| +79% | +$102M |
|
41
Qualcomm
QCOM
$169B
| $231M | 0.41% |
1,447,782
+390,553
| +37% | +$57.5M |
|
42
HubSpot
HUBS
$12B
| $229M | 0.41% |
411,125
+180,098
| +78% | +$105M |
|
43
CME Group
CME
$98.9B
| $227M | 0.4% |
824,490
-194,195
| -19% | -$52.8M |
|
|
44
Aon
AON
$75.3B
| $225M | 0.4% |
629,555
+624,321
| +11,928% | +$226M |
|
|
45
Chubb
CB
$132B
| $224M | 0.4% |
773,426
+767,626
| +13,235% | +$221M |
|
46
Mercado Libre
MELI
$97.5B
| $224M | 0.4% |
85,532
-24,697
| -22% | -$57.7M |
|
47
Intuitive Surgical
ISRG
$134B
| $218M | 0.39% |
400,871
-10,790
| -3% | -$5.64M |
|
|
MRSH
48
Marsh
MRSH
$91.6B
| $217M | 0.38% |
993,284
+778,413
| +362% | +$176M |
|
49
Coupang
CPNG
$29.6B
| $217M | 0.38% |
7,242,249
+6,061,224
| +513% | +$155M |
|
50
Robinhood
HOOD
$97.2B
| $217M | 0.38% |
2,315,076
-76,268
| -3% | -$4.51M |
|
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.