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 | |
|---|---|---|---|---|---|---|
|
BRDG
5026
CALL
DELISTED
Bridge Investment Group
BRDG
| $123K | ﹤0.01% |
12,300
+7,600
| +162% | +$70.9K |
|
5027
PUT
ChargePoint
CHPT
$142M
| $123K | ﹤0.01% |
8,785
+495
| +6% | +$6.63K |
|
5028
PUT
Cheniere Energy
CQP
$31.5B
| $123K | ﹤0.01% |
2,200
-1,800
| -45% | -$105K |
|
5029
CALL
Heartland Express
HTLD
$986M
| $123K | ﹤0.01% |
14,300
+14,000
| +4,667% | +$120K |
|
5030
CALL
iRhythm Holdings
IRTC
$3.91B
| $123K | ﹤0.01% |
800
-7,300
| -90% | -$943K |
|
5031
PUT
Procore
PCOR
$8.12B
| $123K | ﹤0.01% |
1,800
-47,900
| -96% | -$3.13M |
|
|
PSTL
5032
CALL
Postal Realty Trust
PSTL
$694M
| $123K | ﹤0.01% |
8,400
+4,800
| +133% | +$65.9K |
|
5033
Schwab 1000 Index ETF
SCHK
$5.68B
| $123K | ﹤0.01% |
+4,140
| New | +$114K |
|
5034
PUT
SFL Corp
SFL
$1.64B
| $123K | ﹤0.01% |
14,800
+700
| +5% | +$5.81K |
|
5035
iPath Series B S&P 500 VIX Mid-Term Futures ETN
VXZ
$31.1M
| $123K | ﹤0.01% |
+2,114
| New | +$128K |
|
5036
CALL
Yelp
YELP
$1.44B
| $123K | ﹤0.01% |
3,600
-200
| -5% | -$7.23K |
|
|
CVAC
5037
DELISTED
CureVac
CVAC
| $122K | ﹤0.01% |
22,495
+9,019
| +67% | +$35.8K |
|
5038
ProShares UltraShort FTSE Europe
EPV
$10.9M
| $122K | ﹤0.01% |
+4,700
| New | +$140K |
|
5039
Cedar Fair
FUN
$1.81B
| $122K | ﹤0.01% |
4,031
+3,120
| +342% | +$105K |
|
5040
CALL
NMI Holdings
NMIH
$3.3B
| $122K | ﹤0.01% |
2,900
+2,700
| +1,350% | +$101K |
|
5041
CALL
Phunware
PHUN
$43.8M
| $122K | ﹤0.01% |
38,600
+5,300
| +16% | +$15.7K |
|
|
THS
5042
PUT
DELISTED
Treehouse Foods
THS
| $122K | ﹤0.01% |
6,300
+1,900
| +43% | +$42.6K |
|
|
UROY
5043
PUT
Uranium Royalty Corp
UROY
$540M
| $122K | ﹤0.01% |
49,000
+44,500
| +989% | +$90K |
|
5044
ARKO Corp
ARKO
$903M
| $121K | ﹤0.01% |
28,756
+2,613
| +10% | +$11.4K |
|
5045
CALL
Blackbaud
BLKB
$1.84B
| $121K | ﹤0.01% |
+1,900
| New | +$119K |
|
5046
Knight Transportation
KNX
$11.3B
| $121K | ﹤0.01% |
2,737
-34,590
| -93% | -$1.47M |
|
5047
El Pollo Loco
LOCO
$502M
| $121K | ﹤0.01% |
11,011
+9,918
| +907% | +$98.3K |
|
5048
ProShares K-1 Free Crude Oil Strategy ETF
OILK
$206M
| $121K | ﹤0.01% |
3,034
+3,028
| +50,467% | +$120K |
|
|
LINE
5049
CALL
Lineage Inc
LINE
$9.76B
| $121K | ﹤0.01% |
2,800
-4,100
| -59% | -$198K |
|
|
ONC
5050
BeOne Medicines Ltd
ONC
$33.4B
| $121K | ﹤0.01% |
503
-2,514
| -83% | -$617K |
|
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.