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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5401
PUT
Evolent Health
EVH
$488M
| $112K | ﹤0.01% |
20,700
+17,600
| +568% | +$67.5K |
|
5402
Direxion Daily Mid Cap Bull 3X ETF
MIDU
$69.4M
| $112K | ﹤0.01% |
1,498
+575
| +62% | +$37.7K |
|
5403
PUT
TransAlta
TAC
$3.78B
| $112K | ﹤0.01% |
8,100
-200
| -2% | -$2.64K |
|
|
HUYA
5404
PUT
Huya Inc
HUYA
$484M
| $112K | ﹤0.01% |
48,700
+28,700
| +144% | +$81.3K |
|
5405
CALL
Enterprise Financial Services Corp
EFSC
$2.34B
| $112K | ﹤0.01% |
+1,700
| New | +$102K |
|
5406
CALL
Huntington Ingalls Industries
HII
$11.3B
| $112K | ﹤0.01% |
400
-7,100
| -95% | -$2.37M |
|
|
5407
PUT
Huntington Ingalls Industries
HII
$11.3B
| $112K | ﹤0.01% |
400
-900
| -69% | -$301K |
|
5408
CALL
American Financial Group
AFG
$11.8B
| $112K | ﹤0.01% |
800
-200
| -20% | -$26.5K |
|
5409
PUT
Real REMAX Group Inc. Common Stock
REAX
$407M
| $112K | ﹤0.01% |
6,150
+5,960
| +3,137% | +$121K |
|
5410
PUT
Qorvo
QRVO
$9.07B
| $112K | ﹤0.01% |
1,200
+100
| +9% | +$9.22K |
|
|
AFCG
5411
PUT
AFC Gamma
AFCG
$80.5M
| $112K | ﹤0.01% |
36,100
+22,600
| +167% | +$71K |
|
5412
iShares MSCI Emerging Markets ex China ETF
EMXC
$25.7B
| $112K | ﹤0.01% |
+1,093
| New | +$103K |
|
|
SFD
5413
PUT
Smithfield Foods
SFD
$8.65B
| $112K | ﹤0.01% |
4,600
+1,900
| +70% | +$50.8K |
|
|
5414
Real REMAX Group Inc. Common Stock
REAX
$407M
| $112K | ﹤0.01% |
6,131
+5,945
| +3,196% | +$121K |
|
5415
Lear
LEA
$6.64B
| $112K | ﹤0.01% |
832
+760
| +1,056% | +$102K |
|
5416
HealthStream
HSTM
$854M
| $111K | ﹤0.01% |
+4,087
| New | +$95.7K |
|
5417
CALL
Flowserve
FLS
$9.74B
| $111K | ﹤0.01% |
1,500
-200
| -12% | -$15.2K |
|
5418
CALL
Central Garden & Pet Co Class A
CENTA
$2.26B
| $111K | ﹤0.01% |
2,500
| – | – |
|
5419
CALL
Alto Neuroscience
ANRO
$1.4B
| $111K | ﹤0.01% |
+4,200
| New | +$97.1K |
|
5420
PUT
Ocugen
OCGN
$461M
| $111K | ﹤0.01% |
72,400
-77,300
| -52% | -$117K |
|
5421
CALL
Mueller Industries
MLI
$14.1B
| $111K | ﹤0.01% |
1,800
+200
| +13% | +$13.1K |
|
|
CYPH
5422
CALL
Cypherpunk Technologies Inc
CYPH
$261M
| $111K | ﹤0.01% |
180,700
+117,000
| +184% | +$107K |
|
5423
Janux Therapeutics
JANX
$1.24B
| $110K | ﹤0.01% |
+7,192
| New | +$104K |
|
5424
Pacific Biosciences
PACB
$420M
| $110K | ﹤0.01% |
65,659
-43,357
| -40% | -$63K |
|
5425
Vanguard Russell 2000 ETF
VTWO
$17.4B
| $110K | ﹤0.01% |
+908
| New | +$103K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.