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 | |
|---|---|---|---|---|---|---|
|
LTC
6651
LTC Properties
LTC
$2.14B
| $23K | ﹤0.01% |
+693
| New | +$24.4K |
|
6652
VanEck Mortgage REIT Income ETF
MORT
$370M
| $23K | ﹤0.01% |
2,246
-834
| -27% | -$8.47K |
|
|
MRC
6653
CALL
DELISTED
MRC Global
MRC
| $23K | ﹤0.01% |
1,700
-600
| -26% | -$7.24K |
|
6654
CALL
Nkarta
NKTX
$159M
| $23K | ﹤0.01% |
13,900
+6,600
| +90% | +$12.1K |
|
6655
PUT
Patria Investments
PAX
$1.79B
| $23K | ﹤0.01% |
1,700
-13,900
| -89% | -$167K |
|
6656
PUT
Principal Financial Group
PFG
$24.5B
| $23K | ﹤0.01% |
300
-700
| -70% | -$53.7K |
|
6657
CALL
RLX Technology
RLX
$2.43B
| $23K | ﹤0.01% |
10,600
-5,400
| -34% | -$10.6K |
|
6658
CALL
SunCoke Energy
SXC
$779M
| $23K | ﹤0.01% |
2,700
+2,200
| +440% | +$19.1K |
|
6659
PUT
BlackRock TCP Capital
TCPC
$274M
| $23K | ﹤0.01% |
3,100
+300
| +11% | +$2.2K |
|
6660
PUT
TFS Financial
TFSL
$5.18B
| $23K | ﹤0.01% |
1,800
-300
| -14% | -$3.86K |
|
6661
PUT
TETRA Technologies
TTI
$1.07B
| $23K | ﹤0.01% |
7,000
-128,800
| -95% | -$375K |
|
|
UDMY
6662
CALL
DELISTED
Udemy
UDMY
| $23K | ﹤0.01% |
3,300
+1,900
| +136% | +$13.1K |
|
|
UMH
6663
CALL
UMH Properties
UMH
$1.34B
| $23K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$22.2K |
|
6664
Workiva
WK
$3.28B
| $23K | ﹤0.01% |
340
-163
| -32% | -$11.2K |
|
|
YRD
6665
PUT
Yiren Digital
YRD
$98.9M
| $23K | ﹤0.01% |
4,000
+500
| +14% | +$3.15K |
|
|
BAI
6666
iShares A.I. Innovation and Tech Active ETF
BAI
$12.1B
| $23K | ﹤0.01% |
+827
| New | +$20.2K |
|
6667
T-Rex 2X Long Apple Daily Target ETF
AAPX
$11.2M
| $22K | ﹤0.01% |
1,176
+524
| +80% | +$9.87K |
|
|
ACRE
6668
CALL
Ares Commercial Real Estate
ACRE
$256M
| $22K | ﹤0.01% |
4,800
+3,000
| +167% | +$13.3K |
|
6669
PUT
Allogene Therapeutics
ALLO
$573M
| $22K | ﹤0.01% |
20,300
-2,200
| -10% | -$2.92K |
|
6670
CALL
Credicorp
BAP
$30.9B
| $22K | ﹤0.01% |
+100
| New | +$20.3K |
|
6671
PUT
Backblaze
BLZE
$724M
| $22K | ﹤0.01% |
4,000
+1,500
| +60% | +$7.63K |
|
6672
United States Brent Oil Fund
BNO
$724M
| $22K | ﹤0.01% |
+781
| New | +$22K |
|
6673
CALL
BRC Inc
BRCC
$118M
| $22K | ﹤0.01% |
17,100
+9,400
| +122% | +$17.4K |
|
6674
PUT
Clean Energy Fuels
CLNE
$421M
| $22K | ﹤0.01% |
11,400
-4,200
| -27% | -$7.14K |
|
6675
CALL
Coca-Cola Consolidated
COKE
$13B
| $22K | ﹤0.01% |
+200
| New | +$24.2K |
|
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.