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 | |
|---|---|---|---|---|---|---|
4151
Customers Bancorp
CUBI
$2.69B
| $281K | ﹤0.01% |
4,788
-2,867
| -37% | -$145K |
|
4152
PUT
Jack in the Box
JACK
$308M
| $281K | ﹤0.01% |
16,100
-29,200
| -64% | -$657K |
|
4153
CALL
Kinetik
KNTK
$3.64B
| $281K | ﹤0.01% |
6,400
-10,000
| -61% | -$439K |
|
4154
iShares Europe ETF
IEV
$1.64B
| $280K | ﹤0.01% |
+4,440
| New | +$270K |
|
4155
Sportsman's Warehouse
SPWH
$45.7M
| $280K | ﹤0.01% |
81,275
+72,704
| +848% | +$163K |
|
4156
CALL
Terex
TEX
$7.84B
| $280K | ﹤0.01% |
6,000
-3,400
| -36% | -$142K |
|
4157
CALL
WisdomTree
WT
$2.97B
| $280K | ﹤0.01% |
24,400
-4,700
| -16% | -$44K |
|
4158
CALL
Strive Inc
ASST
$1.01B
| $279K | ﹤0.01% |
+3,725
| New | +$301K |
|
4159
DoubleVerify
DV
$1.73B
| $279K | ﹤0.01% |
+18,697
| New | +$256K |
|
|
DX
4160
PUT
Dynex Capital
DX
$3.19B
| $279K | ﹤0.01% |
22,900
-16,100
| -41% | -$195K |
|
4161
CALL
Suburban Propane Partners
SPH
$1.24B
| $279K | ﹤0.01% |
15,100
-3,600
| -19% | -$70K |
|
4162
CALL
ARS Pharmaceuticals
SPRY
$563M
| $279K | ﹤0.01% |
16,000
-5,000
| -24% | -$72.1K |
|
4163
CALL
Teekay Tankers
TNK
$2.66B
| $279K | ﹤0.01% |
6,700
-32,600
| -83% | -$1.39M |
|
4164
Unum
UNM
$14B
| $279K | ﹤0.01% |
3,462
-1,270
| -27% | -$100K |
|
4165
PUT
W.R. Berkley
WRB
$28.3B
| $279K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$258K |
|
|
CRWL
4166
GraniteShares 2x Long CRWD Daily ETF
CRWL
$38.5M
| $279K | ﹤0.01% |
+6,607
| New | +$212K |
|
|
ACB
4167
CALL
Aurora Cannabis
ACB
$168M
| $278K | ﹤0.01% |
65,700
-8,200
| -11% | -$39.7K |
|
4168
CALL
AutoNation
AN
$7.37B
| $278K | ﹤0.01% |
1,400
-400
| -22% | -$72.2K |
|
4169
CALL
Community Health Systems
CYH
$393M
| $278K | ﹤0.01% |
81,900
-64,400
| -44% | -$207K |
|
4170
PUT
Intapp
INTA
$2.36B
| $278K | ﹤0.01% |
5,400
+4,600
| +575% | +$251K |
|
4171
Invesco Mortgage Capital
IVR
$769M
| $278K | ﹤0.01% |
35,525
-5,376
| -13% | -$39.6K |
|
4172
PUT
Universal Display
OLED
$3.85B
| $278K | ﹤0.01% |
1,800
-3,500
| -66% | -$490K |
|
4173
CALL
Arcturus Therapeutics
ARCT
$163M
| $277K | ﹤0.01% |
21,300
+12,400
| +139% | +$147K |
|
4174
CALL
Clean Harbors
CLH
$16B
| $277K | ﹤0.01% |
1,200
-5,400
| -82% | -$1.18M |
|
4175
CALL
Piper Sandler
PIPR
$5.24B
| $277K | ﹤0.01% |
4,000
| – | – |
|
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.