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 | |
|---|---|---|---|---|---|---|---|
6751
Solid Power
SLDP
$452M
| $30K | ﹤0.01% |
11,566
+9,933
| +608% | +$30.7K |
2024 Q3
7 quarters
|
|
6752
PUT
Clean Harbors
CLH
$16.8B
| $29.9K | ﹤0.01% |
+100
| New | +$29.5K |
2026 Q2
0 quarters
|
|
6753
CALL
SoundThinking
SSTI
$111M
| $29.9K | ﹤0.01% |
3,300
+2,300
| +230% | +$16.4K |
2024 Q4
6 quarters
|
|
6754
PUT
Innoviz Technologies
INVZ
$66.7M
| $29.8K | ﹤0.01% |
39,200
+1,700
| +5% | +$1.16K |
2021 Q2
20 quarters
|
|
6755
Huya Inc
HUYA
$509M
| $29.8K | ﹤0.01% |
+12,968
| New | +$36.8K |
2026 Q2
0 quarters
|
|
6756
MiMedx Group
MDXG
$571M
| $29.8K | ﹤0.01% |
7,744
-6,112
| -44% | -$22.3K |
2025 Q4
2 quarters
|
|
6757
PUT
Zedge
ZDGE
$42.5M
| $29.8K | ﹤0.01% |
9,600
-56,200
| -85% | -$174K |
2025 Q3
3 quarters
|
|
6758
PUT
Materion
MTRN
$4.61B
| $29.7K | ﹤0.01% |
+100
| New | +$20.9K |
2026 Q2
0 quarters
|
|
6759
PUT
Trupanion
TRUP
$1.29B
| $29.7K | ﹤0.01% |
1,200
-5,000
| -81% | -$122K |
2017 Q4
34 quarters
|
|
6760
PUT
Renaissance International IPO ETF
IPOS
$9.24M
| $29.7K | ﹤0.01% |
+500
| New | +$11.1K |
2026 Q2
0 quarters
|
|
6761
PUT
Cirrus Logic
CRUS
$5.63B
| $29.7K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
6762
PUT
Kemper
KMPR
$1.7B
| $29.7K | ﹤0.01% |
+1,100
| New | +$32K |
2026 Q2
0 quarters
|
|
6763
PUT
EquipmentShare.com Inc
EQPT
$4.06B
| $29.5K | ﹤0.01% |
1,500
+500
| +50% | +$10.7K |
2026 Q1
1 quarter
|
|
6764
CALL
Sasol
SSL
$11.6B
| $29.5K | ﹤0.01% |
3,000
-68,700
| -96% | -$868K |
2024 Q4
6 quarters
|
|
6765
Cumberland Pharmaceuticals
CPIX
$127M
| $29.4K | ﹤0.01% |
+4,544
| New | +$21.8K |
2026 Q2
0 quarters
|
|
6766
CALL
Simmons First National
SFNC
$3.37B
| $29.4K | ﹤0.01% |
1,300
-500
| -28% | -$10.7K |
2022 Q4
14 quarters
|
|
6767
CALL
Nuvectis Pharma
NVCT
$655M
| $29.4K | ﹤0.01% |
1,600
+1,500
| +1,500% | +$16.8K |
2025 Q1
5 quarters
|
|
6768
ProShares UltraShort Energy
DUG
$31.2M
| $29.4K | ﹤0.01% |
+1,376
| New | +$26.2K |
2026 Q2
0 quarters
|
|
6769
Utz Brands
UTZ
$1.27B
| $29.4K | ﹤0.01% |
3,814
+935
| +32% | +$6.97K |
2025 Q3
3 quarters
|
|
6770
PUT
Global X MSCI Norway ETF
NORW
$93.7M
| $29.4K | ﹤0.01% |
1,000
-400
| -29% | -$15K |
2017 Q2
36 quarters
|
|
|
IELG
6771
CALL
DELISTED
ISHARES ENHANCED U.S. LARGE CAP ETF
IELG
| $29.3K | ﹤0.01% |
800
+200
| +33% | +$7.32K |
2025 Q1
5 quarters
|
|
6772
PUT
Tyler Technologies
TYL
$16B
| $29.2K | ﹤0.01% |
100
-2,000
| -95% | -$632K |
2024 Q4
6 quarters
|
|
6773
CALL
Schneider National
SNDR
$5.32B
| $29.2K | ﹤0.01% |
800
-3,100
| -79% | -$101K |
2025 Q4
2 quarters
|
|
6774
PUT
Baytex Energy
BTE
$3.85B
| $29.2K | ﹤0.01% |
7,300
-8,000
| -52% | -$37K |
2023 Q2
12 quarters
|
|
6775
CALL
OGE Energy
OGE
$10B
| $29.2K | ﹤0.01% |
600
| – | – |
2018 Q2
32 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.