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 | |
|---|---|---|---|---|---|---|---|
5826
CALL
Milestone Pharmaceuticals
MIST
$94.3M
| $78.8K | ﹤0.01% |
58,800
+30,200
| +106% | +$48.3K |
2026 Q1
1 quarter
|
|
5827
Lantronix
LTRX
$295M
| $78.6K | ﹤0.01% |
13,365
+7,357
| +122% | +$47.2K |
2023 Q1
13 quarters
|
|
5828
CALL
Upwork
UPWK
$1.12B
| $78.6K | ﹤0.01% |
9,400
-12,800
| -58% | -$121K |
2018 Q4
30 quarters
|
|
5829
CALL
Kanzhun
BZ
$7.03B
| $78.5K | ﹤0.01% |
6,100
+4,600
| +307% | +$63.1K |
2021 Q4
18 quarters
|
|
5830
PUT
Northwest Natural Holdings
NWN
$2.08B
| $78.5K | ﹤0.01% |
+1,600
| New | +$81.9K |
2026 Q2
0 quarters
|
|
5831
PUT
Pathward Financial
CASH
$1.58B
| $78.4K | ﹤0.01% |
+900
| New | +$77.9K |
2026 Q2
0 quarters
|
|
5832
PUT
Gentex
GNTX
$4.23B
| $78.3K | ﹤0.01% |
3,100
+2,600
| +520% | +$61.5K |
2018 Q1
33 quarters
|
|
5833
PUT
Odyssey Marine Exploration
OMEX
$31.8M
| $78.2K | ﹤0.01% |
92,000
+12,600
| +16% | +$12.8K |
2023 Q1
13 quarters
|
|
5834
CALL
Tuya Inc
TUYA
$981M
| $78.1K | ﹤0.01% |
44,400
+3,300
| +8% | +$7.19K |
2024 Q4
6 quarters
|
|
5835
Skyward Specialty Insurance
SKWD
$2.57B
| $78.1K | ﹤0.01% |
1,339
-5,287
| -80% | -$249K |
2024 Q1
9 quarters
|
|
5836
PUT
CVR Partners
UAN
$1.32B
| $78K | ﹤0.01% |
700
+600
| +600% | +$73.6K |
2020 Q4
22 quarters
|
|
5837
PUT
Rogers Communications
RCI
$16.9B
| $78K | ﹤0.01% |
2,400
+700
| +41% | +$25.3K |
2023 Q3
11 quarters
|
|
5838
Avantis US Small Cap Value ETF
AVUV
$31.9B
| $78K | ﹤0.01% |
+625
| New | +$74.6K |
2026 Q2
0 quarters
|
|
5839
17 Education & Technology Group
YQ
$28.6M
| $78K | ﹤0.01% |
35,441
+16,386
| +86% | +$36.8K |
2026 Q1
1 quarter
|
|
5840
CALL
1-800-Flowers.com
FLWS
$189M
| $78K | ﹤0.01% |
22,400
+7,800
| +53% | +$30.8K |
2019 Q2
28 quarters
|
|
5841
PUT
OGE Energy
OGE
$10.1B
| $77.9K | ﹤0.01% |
1,600
-5,200
| -76% | -$249K |
2024 Q4
6 quarters
|
|
5842
CALL
Teekay Tankers
TNK
$3.44B
| $77.8K | ﹤0.01% |
1,200
+100
| +9% | +$7.53K |
2026 Q1
1 quarter
|
|
5843
CALL
Agora
API
$377M
| $77.8K | ﹤0.01% |
19,500
+9,400
| +93% | +$37.8K |
2024 Q4
6 quarters
|
|
5844
PUT
Dream Finders Homes
DFH
$880M
| $77.7K | ﹤0.01% |
4,500
+2,200
| +96% | +$32.3K |
2022 Q3
15 quarters
|
|
5845
PUT
Flotek Industries
FTK
$945M
| $77.6K | ﹤0.01% |
3,300
+1,600
| +94% | +$31K |
2026 Q1
1 quarter
|
|
5846
Vanguard Short-Term Treasury ETF
VGSH
$35.2B
| $77.5K | ﹤0.01% |
1,332
+840
| +171% | +$49K |
2025 Q4
2 quarters
|
|
5847
IperionX
IPX
$565M
| $77.4K | ﹤0.01% |
+2,604
| New | +$88.8K |
2026 Q2
0 quarters
|
|
5848
CALL
Maravai LifeSciences
MRVI
$1.27B
| $77.4K | ﹤0.01% |
12,400
-24,300
| -66% | -$105K |
2026 Q1
1 quarter
|
|
5849
PUT
Easterly Government Properties
DEA
$1.07B
| $77.3K | ﹤0.01% |
3,100
-11,300
| -78% | -$265K |
2021 Q1
21 quarters
|
|
5850
CALL
Cullen/Frost Bankers
CFR
$9.8B
| $77.3K | ﹤0.01% |
500
+300
| +150% | +$42.6K |
2026 Q1
1 quarter
|
|
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.