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 | |
|---|---|---|---|---|---|---|
4376
CALL
Root
ROOT
$716M
| $263K | ﹤0.01% |
4,700
-3,000
| -39% | -$160K |
|
4377
Dakota Gold
DC
$828M
| $263K | ﹤0.01% |
61,687
+28,925
| +88% | +$156K |
|
4378
United States 12 Month Oil Fund,
USL
$48.3M
| $262K | ﹤0.01% |
5,780
+819
| +17% | +$41.8K |
|
4379
Chord Energy
CHRD
$7.34B
| $262K | ﹤0.01% |
2,294
-3,468
| -60% | -$470K |
|
4380
Ovintiv
OVV
$16.3B
| $262K | ﹤0.01% |
4,980
-1,968
| -28% | -$112K |
|
4381
Atmos Energy
ATO
$26.6B
| $262K | ﹤0.01% |
+1,521
| New | +$272K |
|
4382
PUT
ARKO Corp
ARKO
$467M
| $262K | ﹤0.01% |
32,600
-1,700
| -5% | -$11.9K |
|
4383
CALL
Reliance Steel & Aluminium
RS
$19.7B
| $262K | ﹤0.01% |
700
+500
| +250% | +$183K |
|
|
EMBJ
4384
Embraer S.A. ADS
EMBJ
$13.7B
| $261K | ﹤0.01% |
+4,098
| New | +$252K |
|
4385
Mach Natural Resources
MNR
$1.7B
| $261K | ﹤0.01% |
+20,665
| New | +$276K |
|
4386
PUT
Comstock Resources
CRK
$3.7B
| $261K | ﹤0.01% |
17,500
-1,800
| -9% | -$27.5K |
|
4387
PUT
10x Genomics
TXG
$11.5B
| $261K | ﹤0.01% |
6,800
+6,700
| +6,700% | +$176K |
|
4388
CALL
Breakwave Tanker Shipping ETF
BWET
$211M
| $261K | ﹤0.01% |
2,400
+1,900
| +380% | +$320K |
|
4389
PUT
Scotiabank
BNS
$112B
| $261K | ﹤0.01% |
3,000
-19,800
| -87% | -$1.56M |
|
4390
PUT
BioCryst Pharmaceuticals
BCRX
$2.13B
| $260K | ﹤0.01% |
26,000
-8,700
| -25% | -$78.7K |
|
4391
CALL
OneSpaWorld
OSW
$2.35B
| $260K | ﹤0.01% |
9,200
+9,100
| +9,100% | +$225K |
|
|
SNDU
4392
T-REX 2X Long SNDK Daily Target ETF
SNDU
$228M
| $260K | ﹤0.01% |
+3,827
| New | +$131K |
|
4393
PUT
Xenon Pharmaceuticals
XENE
$3.56B
| $260K | ﹤0.01% |
4,300
-6,100
| -59% | -$339K |
|
4394
CALL
TPG
TPG
$7.24B
| $260K | ﹤0.01% |
6,400
-1,400
| -18% | -$58.9K |
|
4395
CALL
Manulife Financial
MFC
$71.5B
| $259K | ﹤0.01% |
6,400
+3,200
| +100% | +$124K |
|
4396
CALL
Outfront Media
OUT
$4.93B
| $259K | ﹤0.01% |
7,900
+4,600
| +139% | +$143K |
|
4397
MannKind Corp
MNKD
$1.07B
| $259K | ﹤0.01% |
60,749
-91,722
| -60% | -$298K |
|
4398
PUT
Xperi
XPER
$267M
| $258K | ﹤0.01% |
31,400
-28,600
| -48% | -$207K |
|
4399
CALL
nCino
NCNO
$1.9B
| $258K | ﹤0.01% |
15,800
-700
| -4% | -$11.5K |
|
4400
Alpha and Omega Semiconductor
AOSL
$833M
| $258K | ﹤0.01% |
5,452
+432
| +9% | +$17.3K |
|
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.