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 | |
|---|---|---|---|---|---|---|
6126
CALL
LXP Industrial Trust
LXP
$3.58B
| $59.3K | ﹤0.01% |
1,100
-400
| -27% | -$20.6K |
|
6127
Starwood Property Trust
STWD
$5.95B
| $59.2K | ﹤0.01% |
+3,612
| New | +$62.9K |
|
6128
Spire
SR
$4.89B
| $59.1K | ﹤0.01% |
+757
| New | +$65K |
|
6129
Nexstar Media Group
NXST
$5.45B
| $59.1K | ﹤0.01% |
331
-624
| -65% | -$117K |
|
6130
Gold Royalty Corp
GROY
$776M
| $59.1K | ﹤0.01% |
21,405
-55,981
| -72% | -$185K |
|
6131
Duluth Holdings
DLTH
$172M
| $59K | ﹤0.01% |
13,173
+10,702
| +433% | +$38.6K |
|
6132
PUT
Vulcan Materials
VMC
$34B
| $59K | ﹤0.01% |
200
-8,700
| -98% | -$2.49M |
|
6133
PUT
Grindr
GRND
$2.65B
| $58.9K | ﹤0.01% |
4,100
-1,800
| -31% | -$23.3K |
|
6134
PUT
MiMedx Group
MDXG
$666M
| $58.9K | ﹤0.01% |
15,300
-7,800
| -34% | -$28.5K |
|
6135
Microbot Medical
MBOT
$96.7M
| $58.9K | ﹤0.01% |
30,189
-24,653
| -45% | -$50.3K |
|
6136
CALL
Impact Shares Womens Empowerment ETF Trading
WOMN
$59.1M
| $58.8K | ﹤0.01% |
900
+700
| +350% | +$29.4K |
|
6137
Visteon
VC
$2.74B
| $58.8K | ﹤0.01% |
+593
| New | +$64.8K |
|
6138
Bank OZK
OZK
$5.5B
| $58.8K | ﹤0.01% |
+1,128
| New | +$54.9K |
|
6139
CALL
Vanda Pharmaceuticals
VNDA
$328M
| $58.8K | ﹤0.01% |
9,600
-118,700
| -93% | -$775K |
|
|
AYA
6140
CALL
Aya Gold & Silver Inc
AYA
$4.16B
| $58.7K | ﹤0.01% |
+3,100
| New | +$58.6K |
|
6141
PUT
Phunware
PHUN
$42.6M
| $58.6K | ﹤0.01% |
28,600
-206,700
| -88% | -$418K |
|
|
CRWL
6142
GraniteShares 2x Long CRWD Daily ETF
CRWL
$56.2M
| $58.6K | ﹤0.01% |
918
-481
| -34% | -$18.8K |
|
|
XRP
6143
Bitwise XRP ETF
XRP
$317M
| $58.5K | ﹤0.01% |
5,015
-104
| -2% | -$1.52K |
|
6144
CALL
Travelzoo
TZOO
$63.8M
| $58.4K | ﹤0.01% |
+5,000
| New | +$46K |
|
|
ZBIO
6145
CALL
Zenas BioPharma
ZBIO
$2.14B
| $58.4K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$43.7K |
|
6146
CALL
Spok Holdings
SPOK
$224M
| $58.4K | ﹤0.01% |
5,700
+3,000
| +111% | +$32.6K |
|
6147
Protalix BioTherapeutics
PLX
$215M
| $58.4K | ﹤0.01% |
25,048
+2,377
| +10% | +$5.03K |
|
6148
CALL
Compass Therapeutics
CMPX
$429M
| $58.3K | ﹤0.01% |
26,600
+19,900
| +297% | +$58.8K |
|
6149
CALL
Selective Insurance
SIGI
$5.49B
| $58.2K | ﹤0.01% |
+600
| New | +$51.9K |
|
6150
PUT
Build-A-Bear
BBW
$369M
| $58.2K | ﹤0.01% |
1,900
-500
| -21% | -$17.9K |
|
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.