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 | |
|---|---|---|---|---|---|---|
2501
Gevo
GEVO
$378M
| $512K | ﹤0.01% |
387,842
+42
| +0% | +$49 |
|
2502
Star Group
SGU
$414M
| $511K | ﹤0.01% |
43,675
-2,686
| -6% | -$33K |
|
2503
Central Garden & Pet Co Class A
CENTA
$2.4B
| $509K | ﹤0.01% |
16,274
-10,231
| -39% | -$319K |
|
2504
Upland Software
UPLD
$14M
| $508K | ﹤0.01% |
26,043
-4,502
| -15% | -$100K |
|
2505
908 Devices
MASS
$451M
| $506K | ﹤0.01% |
70,994
+1,067
| +2% | +$5.93K |
|
2506
Velocity Financial
VEL
$728M
| $506K | ﹤0.01% |
27,281
-11,319
| -29% | -$198K |
|
2507
Ubiquiti
UI
$33.5B
| $504K | ﹤0.01% |
+1,225
| New | +$446K |
|
2508
Atomera
ATOM
$176M
| $500K | ﹤0.01% |
99,299
+63,414
| +177% | +$338K |
|
2509
Allient
ALNT
$1.58B
| $499K | ﹤0.01% |
13,745
-12,347
| -47% | -$343K |
|
2510
SoundThinking
SSTI
$79.2M
| $498K | ﹤0.01% |
38,110
-1,514
| -4% | -$23.6K |
|
2511
Gran Tierra Energy
GTE
$352M
| $496K | ﹤0.01% |
103,987
-17,424
| -14% | -$82.6K |
|
2512
First Advantage
FA
$3.55B
| $495K | ﹤0.01% |
29,810
-27,313
| -48% | -$441K |
|
2513
MacroGenics
MGNX
$256M
| $493K | ﹤0.01% |
407,288
-247,610
| -38% | -$359K |
|
|
AVB
2514
DELISTED
AvalonBay Communities
AVB
| $492K | ﹤0.01% |
2,419
-889
| -27% | -$182K |
|
2515
Mid-America Apartment Communities
MAA
$15.4B
| $491K | ﹤0.01% |
3,319
-4,843
| -59% | -$756K |
|
2516
HBT Financial
HBT
$1.31B
| $490K | ﹤0.01% |
19,443
-1,338
| -6% | -$31.3K |
|
2517
PACCAR
PCAR
$68.4B
| $489K | ﹤0.01% |
+5,140
| New | +$475K |
|
|
PLG
2518
Platinum Group Metals
PLG
$207M
| $488K | ﹤0.01% |
+319,024
| New | +$427K |
|
2519
China Yuchai International
CYD
$1.45B
| $488K | ﹤0.01% |
20,391
-19,655
| -49% | -$345K |
|
2520
Kornit Digital
KRNT
$708M
| $486K | ﹤0.01% |
+24,414
| New | +$487K |
|
2521
RBB Bancorp
RBB
$450M
| $484K | ﹤0.01% |
28,147
+2,310
| +9% | +$37.6K |
|
2522
Leslie's
LESL
$5.44M
| $484K | ﹤0.01% |
57,576
-5,585
| -9% | -$73.5K |
|
|
VG
2523
Venture Global Inc
VG
$36B
| $483K | ﹤0.01% |
31,024
-384,412
| -93% | -$4.45M |
|
2524
Mistras Group
MG
$608M
| $483K | ﹤0.01% |
60,307
-4,311
| -7% | -$36.3K |
|
2525
Annexon
ANNX
$959M
| $483K | ﹤0.01% |
+201,160
| New | +$403K |
|
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.