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 | |
|---|---|---|---|---|---|---|
7126
CALL
Evolution Petroleum
EPM
$132M
| $19.5K | ﹤0.01% |
5,300
-5,800
| -52% | -$25.4K |
|
7127
PUT
Workiva
WK
$4.17B
| $19.4K | ﹤0.01% |
+400
| New | +$20.6K |
|
7128
PUT
Goosehead Insurance
GSHD
$1.55B
| $19.4K | ﹤0.01% |
+400
| New | +$16.5K |
|
7129
Neuronetics
STIM
$219M
| $19.3K | ﹤0.01% |
14,861
+788
| +6% | +$1.15K |
|
|
MPLT
7130
MapLight Therapeutics
MPLT
$639M
| $19.3K | ﹤0.01% |
+538
| New | +$15.5K |
|
|
IRS
7131
IRSA Inversiones y Representaciones
IRS
$1.28B
| $19.3K | ﹤0.01% |
+1,248
| New | +$19K |
|
7132
Boise Cascade
BCC
$2.76B
| $19.3K | ﹤0.01% |
248
+48
| +24% | +$3.56K |
|
7133
PUT
Q2 Holdings
QTWO
$3.87B
| $19.2K | ﹤0.01% |
400
-900
| -69% | -$42.7K |
|
|
LTC
7134
PUT
LTC Properties
LTC
$2.22B
| $19.2K | ﹤0.01% |
500
-700
| -58% | -$26.6K |
|
7135
PUT
Kiniksa Pharmaceuticals
KNSA
$6.08B
| $19.2K | ﹤0.01% |
300
-2,400
| -89% | -$124K |
|
7136
PUT
Regenxbio
RGNX
$590M
| $19.2K | ﹤0.01% |
1,600
+800
| +100% | +$6.64K |
|
|
BKV
7137
CALL
BKV Corp
BKV
$2.85B
| $19.2K | ﹤0.01% |
700
+300
| +75% | +$8.26K |
|
7138
CALL
Solana Company
HSDT
$135M
| $19.1K | ﹤0.01% |
11,600
-7,500
| -39% | -$14.3K |
|
7139
PUT
Prenetics Global
PRE
$427M
| $19.1K | ﹤0.01% |
1,000
+700
| +233% | +$12.9K |
|
7140
PUT
Red Violet
RDVT
$1.22B
| $19.1K | ﹤0.01% |
300
-100
| -25% | -$4.73K |
|
7141
CALL
Boston Omaha
BOC
$415M
| $19.1K | ﹤0.01% |
1,400
+300
| +27% | +$3.77K |
|
7142
CALL
Coca-Cola Consolidated
COKE
$12.6B
| $19.1K | ﹤0.01% |
100
-700
| -88% | -$130K |
|
|
WSE
7143
CALL
Wise Group
WSE
$12.6B
| $19.1K | ﹤0.01% |
+1,600
| New | +$19.1K |
|
7144
CALL
Algoma Steel
ASTL
$498M
| $19K | ﹤0.01% |
4,700
-35,100
| -88% | -$168K |
|
7145
Cricut
CRCT
$1.16B
| $19K | ﹤0.01% |
4,335
+2,660
| +159% | +$11.4K |
|
7146
CALL
CVRx
CVRX
$81.3M
| $19K | ﹤0.01% |
3,700
-700
| -16% | -$4.52K |
|
|
DUOG
7147
Leverage Shares 2X Long DUOL Daily ETF
DUOG
$11.4M
| $19K | ﹤0.01% |
491
+487
| +12,175% | +$18.2K |
|
7148
PUT
Shinhan Financial Group
SHG
$38.6B
| $19K | ﹤0.01% |
+300
| New | +$19.7K |
|
|
HTT
7149
PUT
High Templar Tech Ltd
HTT
$405M
| $18.9K | ﹤0.01% |
7,400
-111,400
| -94% | -$290K |
|
7150
CALL
Radiant Logistics
RLGT
$395M
| $18.9K | ﹤0.01% |
2,000
-23,700
| -92% | -$200K |
|
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.