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 | |
|---|---|---|---|---|---|---|
2776
Immunome
IMNM
$3.18B
| $248K | ﹤0.01% |
26,654
-63,070
| -70% | -$517K |
|
2777
Standard Motor Products
SMP
$838M
| $247K | ﹤0.01% |
+8,048
| New | +$223K |
|
|
INN
2778
Summit Hotel Properties
INN
$662M
| $247K | ﹤0.01% |
48,447
-167,921
| -78% | -$739K |
|
2779
Southern California Bancorp
BCAL
$690M
| $246K | ﹤0.01% |
15,602
+5,209
| +50% | +$74.2K |
|
2780
Alcoa
AA
$13B
| $245K | ﹤0.01% |
8,298
-708,618
| -99% | -$19.1M |
|
|
MRSN
2781
DELISTED
Mersana Therapeutics
MRSN
| $244K | ﹤0.01% |
32,931
+30,785
| +1,435% | +$271K |
|
|
CTNM
2782
Contineum Therapeutics
CTNM
$626M
| $242K | ﹤0.01% |
+60,963
| New | +$265K |
|
2783
Cass Information Systems
CASS
$735M
| $242K | ﹤0.01% |
5,561
+900
| +19% | +$37.6K |
|
2784
MainStreet Bancshares
MNSB
$179M
| $241K | ﹤0.01% |
12,732
-2,732
| -18% | -$49.7K |
|
2785
Starbucks
SBUX
$123B
| $238K | ﹤0.01% |
2,600
-97,279
| -97% | -$8.43M |
|
2786
Malibu Boats
MBUU
$579M
| $238K | ﹤0.01% |
+7,600
| New | +$229K |
|
|
FDIQ
2787
Invesco Bloomberg Financial Data Providers ETF
FDIQ
$44.1M
| $237K | ﹤0.01% |
4,100
-500
| -11% | -$27.5K |
|
2788
MIND Technology
MIND
$39M
| $237K | ﹤0.01% |
+28,043
| New | +$179K |
|
2789
iShares Russell 2000 Value ETF
IWN
$14.6B
| $237K | ﹤0.01% |
1,500
-97,600
| -98% | -$14.5M |
|
|
AHL
2790
DELISTED
Aspen Insurance
AHL
| $236K | ﹤0.01% |
+7,500
| New | +$250K |
|
2791
Graham Corp
GHM
$1.14B
| $236K | ﹤0.01% |
+4,767
| New | +$177K |
|
2792
American Battery Technology Co
ABAT
$327M
| $235K | ﹤0.01% |
145,010
-14,401
| -9% | -$18.7K |
|
2793
Caledonia Mining Corp
CMCL
$483M
| $234K | ﹤0.01% |
12,110
-29,686
| -71% | -$465K |
|
2794
Acumen Pharmaceuticals
ABOS
$223M
| $233K | ﹤0.01% |
200,785
-31,508
| -14% | -$33.9K |
|
2795
Ceco Environmental
CECO
$4.18B
| $230K | ﹤0.01% |
8,135
-47,182
| -85% | -$1.17M |
|
2796
Viatris
VTRS
$19B
| $230K | ﹤0.01% |
25,784
-1,528,599
| -98% | -$12.9M |
|
2797
Treace Medical Concepts
TMCI
$284M
| $230K | ﹤0.01% |
39,081
-42,222
| -52% | -$275K |
|
|
SUNS
2798
Sunrise Realty Trust
SUNS
$103M
| $228K | ﹤0.01% |
21,540
-27,868
| -56% | -$289K |
|
2799
Azenta
AZTA
$1.44B
| $225K | ﹤0.01% |
7,307
-70,430
| -91% | -$1.98M |
|
|
RAPP
2800
Rapport Therapeutics
RAPP
$2.37B
| $224K | ﹤0.01% |
19,743
-14,014
| -42% | -$149K |
|
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.