Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5076
PUT
Cushman & Wakefield Ltd
CWK
$3.23B
| $117K | ﹤0.01% |
10,600
+10,000
| +1,667% | +$98K |
|
5077
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.9B
| $117K | ﹤0.01% |
2,588
+1,033
| +66% | +$44.5K |
|
5078
Everest Group
EG
$14.9B
| $117K | ﹤0.01% |
347
-83
| -19% | -$28.6K |
|
5079
Illinois Tool Works
ITW
$81.6B
| $117K | ﹤0.01% |
+477
| New | +$115K |
|
5080
PUT
MakeMyTrip
MMYT
$5.37B
| $117K | ﹤0.01% |
1,200
-16,100
| -93% | -$1.62M |
|
5081
Match Group
MTCH
$9.17B
| $117K | ﹤0.01% |
3,794
-42,400
| -92% | -$1.27M |
|
|
SAGE
5082
PUT
DELISTED
Sage Therapeutics
SAGE
| $117K | ﹤0.01% |
12,900
+5,600
| +77% | +$41.2K |
|
5083
CALL
Ternium
TX
$9.64B
| $117K | ﹤0.01% |
3,900
-15,400
| -80% | -$441K |
|
5084
PUT
Invesco DB Base Metals Fund
DBB
$310M
| $116K | ﹤0.01% |
8,300
+6,400
| +337% | +$118K |
|
|
DENN
5085
PUT
DELISTED
Denny's
DENN
| $116K | ﹤0.01% |
28,400
+3,700
| +15% | +$14.2K |
|
5086
PUT
DXC Technology
DXC
$1.82B
| $116K | ﹤0.01% |
7,600
-86,800
| -92% | -$1.34M |
|
5087
Genmab
GMAB
$17.6B
| $116K | ﹤0.01% |
5,630
-57,846
| -91% | -$1.19M |
|
5088
CALL
Kenon Holdings
KEN
$3.47B
| $116K | ﹤0.01% |
+2,800
| New | +$93.7K |
|
|
LAND
5089
PUT
Gladstone Land Corp
LAND
$357M
| $116K | ﹤0.01% |
11,500
+100
| +0.9% | +$982 |
|
|
MESO
5090
Mesoblast
MESO
$1.89B
| $116K | ﹤0.01% |
10,673
-5,393
| -34% | -$60.4K |
|
5091
OptimizeRx
OPRX
$118M
| $116K | ﹤0.01% |
8,598
+2,247
| +35% | +$24.6K |
|
5092
CALL
Pinnacle West Capital
PNW
$12.3B
| $116K | ﹤0.01% |
1,300
-800
| -38% | -$73.2K |
|
5093
PUT
ARS Pharmaceuticals
SPRY
$559M
| $116K | ﹤0.01% |
6,700
-86,400
| -93% | -$1.25M |
|
|
XOVR
5094
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.79B
| $116K | ﹤0.01% |
+6,115
| New | +$105K |
|
5095
ATS Corp
ATS
$2.6B
| $115K | ﹤0.01% |
+3,630
| New | +$99.4K |
|
5096
CALL
Designer Brands
DBI
$314M
| $115K | ﹤0.01% |
48,500
+26,400
| +119% | +$79.7K |
|
5097
iHeartMedia
IHRT
$529M
| $115K | ﹤0.01% |
65,386
+21,471
| +49% | +$28.6K |
|
5098
PUT
NerdWallet
NRDS
$592M
| $115K | ﹤0.01% |
10,500
-20,000
| -66% | -$201K |
|
5099
CALL
ACI Worldwide
ACIW
$5.86B
| $114K | ﹤0.01% |
2,500
-900
| -26% | -$44.3K |
|
5100
PUT
Ardelyx
ARDX
$1.25B
| $114K | ﹤0.01% |
29,100
-34,000
| -54% | -$140K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.