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 | |
|---|---|---|---|---|---|---|
2176
AdvanSix
ASIX
$443M
| $997K | ﹤0.01% |
41,969
-25,227
| -38% | -$572K |
|
|
IAS
2177
DELISTED
Integral Ad Science
IAS
| $993K | ﹤0.01% |
+119,500
| New | +$912K |
|
2178
Harrow
HROW
$1.52B
| $992K | ﹤0.01% |
32,475
-68,939
| -68% | -$1.85M |
|
2179
W.R. Berkley
WRB
$25.6B
| $989K | ﹤0.01% |
13,468
-18,958
| -58% | -$1.36M |
|
2180
Neuropace
NPCE
$487M
| $987K | ﹤0.01% |
88,638
+56,206
| +173% | +$703K |
|
2181
Quad
QUAD
$521M
| $987K | ﹤0.01% |
174,630
+1,963
| +1% | +$10.6K |
|
2182
Greif
GEF
$4.86B
| $985K | ﹤0.01% |
15,158
-6,745
| -31% | -$384K |
|
2183
World Acceptance Corp
WRLD
$897M
| $985K | ﹤0.01% |
5,966
-6,006
| -50% | -$856K |
|
|
SEMR
2184
DELISTED
Semrush
SEMR
| $985K | ﹤0.01% |
108,834
-29,008
| -21% | -$281K |
|
2185
Portillo's
PTLO
$354M
| $983K | ﹤0.01% |
84,235
-49,599
| -37% | -$572K |
|
2186
BBVA Argentina
BBAR
$2.97B
| $982K | ﹤0.01% |
59,656
+4,894
| +9% | +$93.5K |
|
2187
Travelzoo
TZOO
$67.9M
| $979K | ﹤0.01% |
76,924
+2,075
| +3% | +$27.2K |
|
2188
Viridian Therapeutics
VRDN
$2.76B
| $978K | ﹤0.01% |
69,977
-152,422
| -69% | -$2.07M |
|
2189
C4 Therapeutics
CCCC
$511M
| $978K | ﹤0.01% |
683,599
+168,996
| +33% | +$246K |
|
2190
Origin Bancorp
OBK
$1.63B
| $977K | ﹤0.01% |
27,336
-25,642
| -48% | -$849K |
|
2191
CPI Card Group
PMTS
$329M
| $976K | ﹤0.01% |
41,131
+4,520
| +12% | +$107K |
|
2192
KNOT Offshore Partners
KNOP
$369M
| $975K | ﹤0.01% |
155,796
+789
| +0.5% | +$5.15K |
|
|
CHX
2193
DELISTED
ChampionX
CHX
| $975K | ﹤0.01% |
39,240
+28,625
| +270% | +$721K |
|
2194
First Trust Dow Jones Select MicroCap Index Fund
FDM
$268M
| $974K | ﹤0.01% |
13,600
-500
| -4% | -$32.3K |
|
2195
MBIA
MBI
$249M
| $971K | ﹤0.01% |
223,739
-55,223
| -20% | -$245K |
|
2196
Sprout Social
SPT
$650M
| $968K | ﹤0.01% |
46,283
-36,050
| -44% | -$764K |
|
2197
POSCO
PKX
$17.9B
| $965K | ﹤0.01% |
19,896
+7,200
| +57% | +$331K |
|
2198
OFS Capital
OFS
$48.6M
| $964K | ﹤0.01% |
114,272
-6,552
| -5% | -$56.4K |
|
2199
Covenant Logistics
CVLG
$872M
| $962K | ﹤0.01% |
39,914
-60,930
| -60% | -$1.32M |
|
2200
Capital City Bank Group
CCBG
$878M
| $958K | ﹤0.01% |
24,341
-1,491
| -6% | -$54.9K |
|
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.