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 | |
|---|---|---|---|---|---|---|---|
5901
Lifezone Metals
LZM
$316M
| $73.6K | ﹤0.01% |
18,959
+17,637
| +1,334% | +$82.4K |
2026 Q1
1 quarter
|
|
5902
Hexcel
HXL
$5.89B
| $73.5K | ﹤0.01% |
+735
| New | +$66.6K |
2026 Q2
0 quarters
|
|
5903
Defiance Daily Target 2x Short MSTR ETF
SMST
$11.8M
| $73.5K | ﹤0.01% |
+927
| New | +$40.4K |
2026 Q2
0 quarters
|
|
5904
CALL
DELISTED
BioLife Solutions
BLFS
| $73.4K | ﹤0.01% |
2,600
+1,500
| +136% | +$35.1K |
2023 Q2
12 quarters
|
|
5905
CALL
AC Immune
ACIU
$227M
| $73.3K | ﹤0.01% |
30,800
-16,900
| -35% | -$46.6K |
2025 Q3
3 quarters
|
|
5906
MBX Biosciences
MBX
$2.56B
| $73.2K | ﹤0.01% |
1,327
+20
| +2% | +$699 |
2025 Q4
2 quarters
|
|
5907
PUT
WD-40
WDFC
$2.9B
| $73.1K | ﹤0.01% |
300
+200
| +200% | +$42.8K |
2018 Q3
31 quarters
|
|
5908
YieldMax Target 12 Semiconductor Option Income ETF
SOXY
$60.6M
| $73K | ﹤0.01% |
+639
| New | +$57.7K |
2026 Q2
0 quarters
|
|
5909
PUT
California Water Service
CWT
$2.92B
| $73K | ﹤0.01% |
1,500
-300
| -17% | -$13.5K |
2025 Q4
2 quarters
|
|
|
SILA
5910
DELISTED
Sila Realty Trust
SILA
| $73K | ﹤0.01% |
2,403
+1,990
| +482% | +$58.2K |
2024 Q4
6 quarters
|
|
5911
CALL
WPP
WPP
$5.53B
| $72.8K | ﹤0.01% |
4,700
+200
| +4% | +$3.56K |
2025 Q3
3 quarters
|
|
5912
PUT
Mohawk Industries
MHK
$8.47B
| $72.8K | ﹤0.01% |
+600
| New | +$63.1K |
2026 Q2
0 quarters
|
|
5913
Azenta
AZTA
$1.79B
| $72.7K | ﹤0.01% |
2,849
+1,862
| +189% | +$41.7K |
2026 Q1
1 quarter
|
|
5914
PUT
MFA Financial
MFA
$682M
| $72.7K | ﹤0.01% |
7,500
-162,200
| -96% | -$1.57M |
2018 Q2
32 quarters
|
|
5915
Milestone Pharmaceuticals
MIST
$94.9M
| $72.6K | ﹤0.01% |
54,171
-95,120
| -64% | -$152K |
2026 Q1
1 quarter
|
|
5916
TON Strategy Co
TONX
$182M
| $72.5K | ﹤0.01% |
28,435
+24,206
| +572% | +$71.6K |
2025 Q3
3 quarters
|
|
5917
CALL
Orion Digital Corp
ORIO
$21M
| $72.2K | ﹤0.01% |
85,000
| – | – |
2024 Q4
6 quarters
|
|
5918
PUT
Sabra Healthcare REIT
SBRA
$4.84B
| $72.2K | ﹤0.01% |
3,700
+2,100
| +131% | +$41.7K |
2018 Q2
32 quarters
|
|
5919
Liberty Latin America Class C
LILAK
$1.55B
| $72.2K | ﹤0.01% |
+9,262
| New | +$67.1K |
2026 Q2
0 quarters
|
|
5920
CALL
NanoViricides
NNVC
$37.3M
| $72K | ﹤0.01% |
52,200
+47,800
| +1,086% | +$65.5K |
2025 Q4
2 quarters
|
|
5921
CALL
WaterBridge Infrastructure LLC
WBI
$1.69B
| $72K | ﹤0.01% |
+2,100
| New | +$61.1K |
2026 Q2
0 quarters
|
|
5922
iShares MSCI USA Value Factor ETF
VLUE
$9.37B
| $71.9K | ﹤0.01% |
360
+136
| +61% | +$24.4K |
2025 Q4
2 quarters
|
|
5923
Sprott Junior Uranium Miners ETF
URNJ
$312M
| $71.9K | ﹤0.01% |
3,096
+1,533
| +98% | +$43.7K |
2025 Q4
2 quarters
|
|
5924
CALL
Arcturus Therapeutics
ARCT
$344M
| $71.9K | ﹤0.01% |
10,700
+4,100
| +62% | +$32.3K |
2019 Q1
29 quarters
|
|
5925
Tuttle Capital Concentrated Memory Stack ETF
HBMX
$26.2M
| $71.8K | ﹤0.01% |
+2,299
| New | +$64.4K |
2026 Q2
0 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.