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 | |
|---|---|---|---|---|---|---|
6476
FreightCar America
RAIL
$263M
| $28K | ﹤0.01% |
+3,255
| New | +$22.7K |
|
6477
CALL
Riley Exploration Permian
REPX
$728M
| $28K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$26.4K |
|
6478
PUT
Regal Rexnord
RRX
$12.5B
| $28K | ﹤0.01% |
200
-400
| -67% | -$50.2K |
|
6479
CALL
Senseonics Holdings Inc
SENS
$254M
| $28K | ﹤0.01% |
2,965
+95
| +3% | +$1.11K |
|
6480
CALL
Stoke Therapeutics
STOK
$1.84B
| $28K | ﹤0.01% |
2,500
-1,100
| -31% | -$10.4K |
|
6481
Vanguard Russell 1000 ETF
VONE
$8.09B
| $28K | ﹤0.01% |
100
-24
| -19% | -$6.24K |
|
6482
CALL
NCR Voyix
VYX
$1.19B
| $28K | ﹤0.01% |
2,400
-56,000
| -96% | -$566K |
|
6483
PUT
Walker & Dunlop
WD
$1.73B
| $28K | ﹤0.01% |
400
+300
| +300% | +$21.7K |
|
6484
ProShares Ultra Yen
YCL
$31.7M
| $28K | ﹤0.01% |
1,210
-11,836
| -91% | -$276K |
|
|
LUCK
6485
PUT
Lucky Strike Entertainment
LUCK
$959M
| $28K | ﹤0.01% |
3,100
-2,600
| -46% | -$23.5K |
|
|
PLCY
6486
PUT
DELISTED
EventShares U.S. Legislative Opportunities ETF
PLCY
| $28K | ﹤0.01% |
1,500
-8,000
| -84% | -$149K |
|
|
ACRE
6487
Ares Commercial Real Estate
ACRE
$247M
| $27K | ﹤0.01% |
5,866
-9,405
| -62% | -$41.8K |
|
6488
PUT
Alkami Technology
ALKT
$1.96B
| $27K | ﹤0.01% |
900
+800
| +800% | +$22.2K |
|
6489
PUT
Ardmore Shipping
ASC
$683M
| $27K | ﹤0.01% |
2,900
-14,600
| -83% | -$141K |
|
6490
PUT
Aterian
ATER
$4.07M
| $27K | ﹤0.01% |
16,800
-42,900
| -72% | -$73K |
|
6491
PUT
Byrna Technologies
BYRN
$98.3M
| $27K | ﹤0.01% |
900
-7,000
| -89% | -$171K |
|
6492
CALL
Compugen
CGEN
$212M
| $27K | ﹤0.01% |
15,600
+5,300
| +51% | +$7.86K |
|
6493
PUT
FirstCash
FCFS
$8.77B
| $27K | ﹤0.01% |
+200
| New | +$25.6K |
|
6494
PUT
Full House Resorts
FLL
$83.4M
| $27K | ﹤0.01% |
+7,500
| New | +$25.1K |
|
6495
PUT
GoodRx Holdings
GDRX
$1.09B
| $27K | ﹤0.01% |
5,500
-4,100
| -43% | -$17.8K |
|
6496
PUT
Monte Rosa Therapeutics
GLUE
$1.82B
| $27K | ﹤0.01% |
6,200
-8,600
| -58% | -$38.4K |
|
6497
Korn Ferry
KFY
$4.31B
| $27K | ﹤0.01% |
+379
| New | +$25.2K |
|
6498
CALL
Neumora Therapeutics
NMRA
$306M
| $27K | ﹤0.01% |
37,800
-17,800
| -32% | -$13.5K |
|
|
ONL
6499
CALL
Orion Office REIT
ONL
$151M
| $27K | ﹤0.01% |
+12,700
| New | +$24.2K |
|
6500
CALL
OPAL Fuels
OPAL
$62.5M
| $27K | ﹤0.01% |
+11,400
| New | +$26.5K |
|
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.