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 | Held Since | |
|---|---|---|---|---|---|---|---|
6376
PUT
Global X Zero Coupon Bond 2030 ETF
ZCBA
$962K
| $46.2K | ﹤0.01% |
+900
| New | +$44.5K |
2026 Q2
0 quarters
|
|
6377
eHealth
EHTH
$17.1M
| $46K | ﹤0.01% |
30,901
+18,135
| +142% | +$30.4K |
2026 Q1
1 quarter
|
|
6378
PUT
LENZ Therapeutics
LENZ
$99M
| $46K | ﹤0.01% |
8,100
-5,100
| -39% | -$41.1K |
2025 Q3
3 quarters
|
|
6379
PUT
MNTN Inc
MNTN
$702M
| $46K | ﹤0.01% |
5,000
+3,500
| +233% | +$31.9K |
2025 Q2
4 quarters
|
|
6380
PUT
Intrepid Potash
IPI
$424M
| $45.9K | ﹤0.01% |
1,400
-200
| -13% | -$7.61K |
2026 Q1
1 quarter
|
|
6381
PUT
Full House Resorts
FLL
$30.3M
| $45.8K | ﹤0.01% |
16,400
+16,300
| +16,300% | +$43.1K |
2026 Q1
1 quarter
|
|
6382
PUT
Oportun Financial
OPRT
$432M
| $45.7K | ﹤0.01% |
8,000
| – | – |
2025 Q4
2 quarters
|
|
6383
CALL
SAB Biotherapeutics
SABS
$274M
| $45.6K | ﹤0.01% |
11,700
+4,300
| +58% | +$16K |
2026 Q1
1 quarter
|
|
6384
PUT
Richardson Electronics
RELL
$287M
| $45.6K | ﹤0.01% |
2,400
+600
| +33% | +$9.38K |
2025 Q4
2 quarters
|
|
6385
Direxion Daily AI and Big Data Bull 2X ETF
AIBU
$24.5M
| $45.5K | ﹤0.01% |
718
+15
| +2% | +$868 |
2025 Q4
2 quarters
|
|
6386
PUT
CryoPort
CYRX
$918M
| $45.5K | ﹤0.01% |
2,900
| – | – |
2019 Q4
26 quarters
|
|
6387
PUT
Mach Natural Resources
MNR
$1.76B
| $45.5K | ﹤0.01% |
3,600
+900
| +33% | +$12K |
2026 Q1
1 quarter
|
|
6388
Robinhood Ventures Fund I
RVI
$678M
| $45.5K | ﹤0.01% |
+1,387
| New | +$52.8K |
2026 Q2
0 quarters
|
|
6389
Oxford Industries
OXM
$410M
| $45.4K | ﹤0.01% |
1,302
+1,126
| +640% | +$46.8K |
2026 Q1
1 quarter
|
|
6390
PUT
IDEX
IEX
$17.1B
| $45.4K | ﹤0.01% |
200
+100
| +100% | +$21.2K |
2026 Q1
1 quarter
|
|
6391
PUT
Graco
GGG
$10.7B
| $45.4K | ﹤0.01% |
600
+500
| +500% | +$39.4K |
2026 Q1
1 quarter
|
|
6392
PUT
DELISTED
SkyWater Technology
SKYT
| $45.3K | ﹤0.01% |
1,300
-5,300
| -80% | -$181K |
2021 Q4
18 quarters
|
|
6393
CALL
Golub Capital BDC
GBDC
$3.21B
| $45.1K | ﹤0.01% |
3,500
+1,200
| +52% | +$15.6K |
2020 Q1
25 quarters
|
|
6394
PUT
Boston Omaha
BOC
$383M
| $45K | ﹤0.01% |
3,300
+100
| +3% | +$1.26K |
2025 Q2
4 quarters
|
|
6395
AGCO
AGCO
$7.27B
| $45K | ﹤0.01% |
+376
| New | +$43.7K |
2026 Q2
0 quarters
|
|
6396
PUT
Vermilion Energy
VET
$2.09B
| $45K | ﹤0.01% |
4,800
-50,700
| -91% | -$603K |
2017 Q3
35 quarters
|
|
6397
CALL
VinFast Auto
VFS
$7.09B
| $44.9K | ﹤0.01% |
14,400
-27,700
| -66% | -$104K |
2023 Q3
11 quarters
|
|
6398
PUT
Gladstone Investment Corp
GAIN
$592M
| $44.8K | ﹤0.01% |
2,900
-1,800
| -38% | -$28.2K |
2020 Q1
25 quarters
|
|
6399
VanEck Steel ETF
SLX
$152M
| $44.8K | ﹤0.01% |
+455
| New | +$47.4K |
2026 Q2
0 quarters
|
|
6400
CALL
Tronox
TROX
$575M
| $44.7K | ﹤0.01% |
7,100
-3,700
| -34% | -$31.4K |
2021 Q2
20 quarters
|
|
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.