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 | |
|---|---|---|---|---|---|---|
3976
Capital Southwest
CSWC
$1.48B
| $326K | ﹤0.01% |
14,793
+2,895
| +24% | +$59.6K |
|
|
PBT
3977
PUT
Permian Basin Royalty Trust
PBT
$1.31B
| $326K | ﹤0.01% |
26,200
-116,000
| -82% | -$1.23M |
|
3978
PUT
Park Hotels & Resorts
PK
$3.06B
| $326K | ﹤0.01% |
31,900
+19,700
| +161% | +$201K |
|
3979
CALL
ASE Group
ASX
$74.4B
| $325K | ﹤0.01% |
31,500
+26,400
| +518% | +$246K |
|
3980
Gaotu Techedu
GOTU
$384M
| $325K | ﹤0.01% |
90,181
-32,958
| -27% | -$113K |
|
|
USAR
3981
USA Rare Earth Inc
USAR
$3.44B
| $325K | ﹤0.01% |
+29,682
| New | +$315K |
|
|
AMED
3982
PUT
DELISTED
Amedisys
AMED
| $324K | ﹤0.01% |
3,300
+2,600
| +371% | +$246K |
|
3983
CALL
Home BancShares
HOMB
$6.31B
| $324K | ﹤0.01% |
11,400
+11,300
| +11,300% | +$314K |
|
3984
CALL
United Bankshares
UBSI
$6.71B
| $324K | ﹤0.01% |
8,900
+700
| +9% | +$24.6K |
|
3985
PUT
Atlas Energy Solutions
AESI
$1.37B
| $323K | ﹤0.01% |
24,200
+16,700
| +223% | +$228K |
|
3986
CALL
Frontier Group Holdings
ULCC
$1.43B
| $323K | ﹤0.01% |
89,000
+39,900
| +81% | +$146K |
|
3987
PUT
MannKind Corp
MNKD
$1.21B
| $322K | ﹤0.01% |
86,300
+33,200
| +63% | +$146K |
|
3988
PUT
Syndax Pharmaceuticals
SNDX
$1.74B
| $322K | ﹤0.01% |
34,400
+12,400
| +56% | +$136K |
|
3989
PUT
TFI International
TFII
$12.1B
| $322K | ﹤0.01% |
3,600
+3,500
| +3,500% | +$296K |
|
3990
PUT
LendingTree
TREE
$572M
| $322K | ﹤0.01% |
8,700
+7,700
| +770% | +$311K |
|
3991
Apple Hospitality REIT
APLE
$3.97B
| $321K | ﹤0.01% |
27,533
+22,740
| +474% | +$267K |
|
3992
Hercules Capital
HTGC
$3.04B
| $321K | ﹤0.01% |
17,596
-55,258
| -76% | -$979K |
|
3993
NetApp
NTAP
$34.2B
| $321K | ﹤0.01% |
+3,022
| New | +$287K |
|
3994
Surgery Partners
SGRY
$2.04B
| $321K | ﹤0.01% |
+14,458
| New | +$321K |
|
3995
PUT
Ameriprise Financial
AMP
$48.3B
| $320K | ﹤0.01% |
600
-200
| -25% | -$98.8K |
|
|
3996
PUT
Gaotu Techedu
GOTU
$384M
| $320K | ﹤0.01% |
88,900
+13,000
| +17% | +$44.6K |
|
3997
PUT
Loews
L
$24.6B
| $320K | ﹤0.01% |
+3,500
| New | +$307K |
|
3998
PUT
Upexi
UPXI
$64.7M
| $320K | ﹤0.01% |
+107,400
| New | +$929K |
|
|
AMRN
3999
CALL
Amarin Corp
AMRN
$293M
| $319K | ﹤0.01% |
19,700
+19,255
| +4,327% | +$217K |
|
4000
CALL
Bread Financial
BFH
$4.36B
| $319K | ﹤0.01% |
5,600
+4,200
| +300% | +$212K |
|
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.