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 | |
|---|---|---|---|---|---|---|---|
5951
CALL
Toro Corp
TORO
$153M
| $69.6K | ﹤0.01% |
14,300
+14,100
| +7,050% | +$72.8K |
2025 Q4
2 quarters
|
|
5952
CALL
Savara
SVRA
$1.02B
| $69.6K | ﹤0.01% |
11,300
+8,000
| +242% | +$42.9K |
2020 Q4
22 quarters
|
|
5953
Telesat
TSAT
$719M
| $69.6K | ﹤0.01% |
1,374
-3,986
| -74% | -$193K |
2024 Q4
6 quarters
|
|
5954
PUT
Starling Oncology
STLN
$677M
| $69.5K | ﹤0.01% |
12,800
+4,500
| +54% | +$18.9K |
2025 Q4
2 quarters
|
|
5955
PUT
NioCorp Developments
NB
$499M
| $69.4K | ﹤0.01% |
14,400
-12,400
| -46% | -$67.9K |
2025 Q1
5 quarters
|
|
5956
PUT
Teradata
TDC
$3.17B
| $69.3K | ﹤0.01% |
2,000
+300
| +18% | +$9.12K |
2018 Q2
32 quarters
|
|
5957
CALL
Delcath Systems
DCTH
$513M
| $69.2K | ﹤0.01% |
5,500
-4,400
| -44% | -$48.6K |
2023 Q3
11 quarters
|
|
5958
Direxion Daily S&P 500 Bear 1X ETF
SPDN
$269M
| $69.1K | ﹤0.01% |
7,966
+7,137
| +861% | +$64.1K |
2025 Q1
5 quarters
|
|
5959
WD-40
WDFC
$2.9B
| $69K | ﹤0.01% |
283
+278
| +5,560% | +$59.5K |
2025 Q4
2 quarters
|
|
5960
CALL
International Seaways
INSW
$5.75B
| $68.9K | ﹤0.01% |
900
-12,700
| -93% | -$1.03M |
2020 Q1
25 quarters
|
|
5961
PUT
Navigator Holdings
NVGS
$1.31B
| $68.9K | ﹤0.01% |
+3,700
| New | +$80.3K |
2026 Q2
0 quarters
|
|
5962
PUT
Emera Inc
EMA
$14.9B
| $68.9K | ﹤0.01% |
+1,300
| New | +$68.1K |
2026 Q2
0 quarters
|
|
5963
CALL
Array Digital Infrastructure
AD
$2.75B
| $68.9K | ﹤0.01% |
1,900
-3,900
| -67% | -$185K |
2026 Q1
1 quarter
|
|
|
5964
PUT
Array Digital Infrastructure
AD
$2.75B
| $68.9K | ﹤0.01% |
1,900
| – | – |
2026 Q1
1 quarter
|
|
5965
CALL
Gladstone Commercial Corp
GOOD
$557M
| $68.9K | ﹤0.01% |
5,600
+5,300
| +1,767% | +$66K |
2019 Q3
27 quarters
|
|
5966
OraSure Technologies
OSUR
$281M
| $68.9K | ﹤0.01% |
15,440
-102,611
| -87% | -$363K |
2024 Q3
7 quarters
|
|
5967
CALL
CMS Energy
CMS
$21.4B
| $68.8K | ﹤0.01% |
900
+200
| +29% | +$15K |
2021 Q2
20 quarters
|
|
5968
PUT
Dropbox
DBX
$7.89B
| $68.7K | ﹤0.01% |
2,500
+2,000
| +400% | +$51.4K |
2018 Q2
32 quarters
|
|
5969
CALL
VSE Corp
VSEC
$4.11B
| $68.6K | ﹤0.01% |
300
-2,900
| -91% | -$557K |
2026 Q1
1 quarter
|
|
5970
PUT
Amplify Energy
AMPY
$183M
| $68.5K | ﹤0.01% |
17,200
+14,400
| +514% | +$73.9K |
2021 Q1
21 quarters
|
|
5971
Direxion Daily MRVL Bull 2X ETF
MRVU
$142M
| $68.4K | ﹤0.01% |
+299
| New | +$39K |
2026 Q2
0 quarters
|
|
5972
CALL
Suburban Propane Partners
SPH
$1.18B
| $68.4K | ﹤0.01% |
4,000
-1,600
| -29% | -$30.6K |
2021 Q1
21 quarters
|
|
5973
PUT
Mission Produce
AVO
$1B
| $68.4K | ﹤0.01% |
5,800
+1,800
| +45% | +$22.7K |
2025 Q2
4 quarters
|
|
5974
CALL
PMV Pharmaceuticals
PMVP
$72.2M
| $68.3K | ﹤0.01% |
51,000
+50,400
| +8,400% | +$64.7K |
2026 Q1
1 quarter
|
|
5975
Invesco Galaxy Bitcoin ETF
BTCO
$432M
| $68K | ﹤0.01% |
1,165
+405
| +53% | +$28.9K |
2025 Q4
2 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.