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 | |
|---|---|---|---|---|---|---|
4226
CALL
SS&C Technologies
SSNC
$18.1B
| $298K | ﹤0.01% |
4,800
-16,900
| -78% | -$1.15M |
|
|
GRAL
4227
GRAIL Inc
GRAL
$5.91B
| $298K | ﹤0.01% |
4,362
+1,821
| +72% | +$107K |
|
4228
PUT
Dakota Gold
DC
$833M
| $298K | ﹤0.01% |
69,900
+37,000
| +112% | +$200K |
|
4229
CALL
Option Care Health
OPCH
$3.4B
| $298K | ﹤0.01% |
14,200
+12,100
| +576% | +$281K |
|
4230
SunCoke Energy
SXC
$802M
| $298K | ﹤0.01% |
36,976
+10,943
| +42% | +$84.6K |
|
4231
Navigator Holdings
NVGS
$1.41B
| $298K | ﹤0.01% |
15,975
-22,244
| -58% | -$483K |
|
|
FDRS
4232
PUT
Founder-Led ETF
FDRS
$87.2M
| $297K | ﹤0.01% |
+9,900
| New | +$226K |
|
4233
ProShares VIX Mid-Term Futures ETF
VIXM
$49.9M
| $297K | ﹤0.01% |
20,728
-6,189
| -23% | -$96.7K |
|
4234
CALL
AutoNation
AN
$5.3B
| $297K | ﹤0.01% |
1,600
+1,000
| +167% | +$196K |
|
4235
PUT
Construction Partners
ROAD
$5.26B
| $297K | ﹤0.01% |
2,500
+100
| +4% | +$11.9K |
|
4236
Extra Space Storage
EXR
$27.9B
| $297K | ﹤0.01% |
+2,043
| New | +$292K |
|
4237
CALL
Frontier Group Holdings
ULCC
$1.4B
| $297K | ﹤0.01% |
37,500
+32,500
| +650% | +$168K |
|
4238
CALL
Atkore
ATKR
$3.2B
| $297K | ﹤0.01% |
3,900
+2,400
| +160% | +$181K |
|
4239
Frontdoor
FTDR
$4.95B
| $296K | ﹤0.01% |
+3,820
| New | +$244K |
|
4240
Aaon
AAON
$7.09B
| $296K | ﹤0.01% |
2,335
+1,728
| +285% | +$202K |
|
4241
CALL
Viridian Therapeutics
VRDN
$2.24B
| $296K | ﹤0.01% |
16,100
+3,400
| +27% | +$54.8K |
|
4242
PUT
Relay Therapeutics
RLAY
$3.89B
| $296K | ﹤0.01% |
15,800
+7,600
| +93% | +$110K |
|
4243
Atlas Energy Solutions
AESI
$1.5B
| $296K | ﹤0.01% |
+17,797
| New | +$291K |
|
|
TGB
4244
Trekor Metals
TGB
$3.17B
| $295K | ﹤0.01% |
42,855
-68,723
| -62% | -$491K |
|
4245
CALL
Lloyds Banking Group
LYG
$81.6B
| $294K | ﹤0.01% |
50,500
-31,900
| -39% | -$173K |
|
4246
CALL
Chegg
CHGG
$79.2M
| $294K | ﹤0.01% |
291,200
+62,600
| +27% | +$68.7K |
|
4247
Kiniksa Pharmaceuticals
KNSA
$5.82B
| $294K | ﹤0.01% |
4,598
-3,404
| -43% | -$177K |
|
4248
AXT Inc
AXTI
$5.27B
| $294K | ﹤0.01% |
4,078
-169,496
| -98% | -$15.3M |
|
4249
CALL
LiveRamp
RAMP
$2.29B
| $294K | ﹤0.01% |
7,800
+7,300
| +1,460% | +$240K |
|
4250
CALL
Hilton Grand Vacations
HGV
$2.78B
| $293K | ﹤0.01% |
5,600
-400
| -7% | -$19.3K |
|
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.