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 | |
|---|---|---|---|---|---|---|
376
Flowserve
FLS
$10.1B
| $31.4M | 0.06% |
599,828
+586,220
| +4,308% | +$27.6M |
|
377
Itron
ITRI
$4.38B
| $31.2M | 0.06% |
237,243
+210,479
| +786% | +$23.8M |
|
378
Canadian Imperial Bank of Commerce
CM
$106B
| $31.2M | 0.06% |
440,505
-378,383
| -46% | -$24.4M |
|
379
Western Digital
WDC
$166B
| $31.1M | 0.06% |
486,516
-105,402
| -18% | -$5.02M |
|
380
Southern Copper
SCCO
$182B
| $31.1M | 0.06% |
322,625
+96,116
| +42% | +$8.36M |
|
|
ARES.PRB
381
Ares Management Corp 6.75% Series B Preferred Stock
ARES.PRB
$1.35B
| $31M | 0.05% |
585,348
+20,410
| +4% | +$1.03M |
|
382
GFL Environmental
GFL
$14.8B
| $30.9M | 0.05% |
611,386
+387,964
| +174% | +$19M |
|
383
Applied Industrial Technologies
AIT
$12.5B
| $30.8M | 0.05% |
132,442
+127,847
| +2,782% | +$29.1M |
|
384
Argan
AGX
$7.03B
| $30.8M | 0.05% |
139,589
+703
| +0.5% | +$127K |
|
385
Dutch Bros
BROS
$6.88B
| $30.8M | 0.05% |
449,782
-85,865
| -16% | -$5.6M |
|
386
JFrog
FROG
$11.4B
| $30.7M | 0.05% |
700,577
+680,377
| +3,368% | +$25.9M |
|
387
Unum
UNM
$13.9B
| $30.7M | 0.05% |
380,378
+161,301
| +74% | +$12.7M |
|
388
Roku
ROKU
$23.4B
| $30.5M | 0.05% |
347,553
-382,597
| -52% | -$26.7M |
|
389
Polaris
PII
$3.66B
| $30.4M | 0.05% |
748,819
+284,874
| +61% | +$10.7M |
|
|
VISN
390
Vistance Networks Inc
VISN
$2.59B
| $30.4M | 0.05% |
3,673,551
-556,875
| -13% | -$2.91M |
|
391
Group 1 Automotive
GPI
$3.12B
| $30.4M | 0.05% |
69,575
+30,863
| +80% | +$13M |
|
392
STMicroelectronics
STM
$45.1B
| $30.1M | 0.05% |
988,348
-2,940,238
| -75% | -$73M |
|
|
FBCG
393
Fidelity Blue Chip Growth ETF
FBCG
$7.22B
| $30M | 0.05% |
622,700
+195,800
| +46% | +$8.35M |
|
394
Omega Healthcare
OHI
$14.1B
| $29.7M | 0.05% |
810,702
+638,190
| +370% | +$23.7M |
|
395
Ryan Specialty Holdings
RYAN
$11.1B
| $29.6M | 0.05% |
435,866
+337,088
| +341% | +$23.3M |
|
396
Lam Research
LRCX
$393B
| $29.6M | 0.05% |
303,888
+47,229
| +18% | +$3.75M |
|
397
CAVA Group
CAVA
$8.6B
| $29.6M | 0.05% |
350,881
-329,712
| -48% | -$28.1M |
|
398
Pagaya Technologies
PGY
$1.81B
| $29.4M | 0.05% |
1,380,939
+75,024
| +6% | +$1.07M |
|
399
Oscar Health
OSCR
$9.89B
| $29.3M | 0.05% |
1,366,565
+644,644
| +89% | +$9.58M |
|
400
ZIM Integrated Shipping Services
ZIM
$3.4B
| $29.3M | 0.05% |
1,817,955
-108,754
| -6% | -$1.71M |
|
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.