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 | |
|---|---|---|---|---|---|---|
7001
CALL
Haemonetics
HAE
$4.68B
| $22.5K | ﹤0.01% |
300
+200
| +200% | +$12.8K |
|
7002
Valvoline
VVV
$4.09B
| $22.5K | ﹤0.01% |
569
-3,684
| -87% | -$128K |
|
7003
CALL
Mayville Engineering Co
MEC
$501M
| $22.5K | ﹤0.01% |
600
-700
| -54% | -$18.7K |
|
7004
CALL
Middlesex Water
MSEX
$1.1B
| $22.5K | ﹤0.01% |
400
-100
| -20% | -$5.26K |
|
|
AVGW
7005
Roundhill AVGO WeeklyPay ETF
AVGW
$44.8M
| $22.4K | ﹤0.01% |
567
-242
| -30% | -$11.1K |
|
7006
PUT
Fossil Group
FOSL
$305M
| $22.4K | ﹤0.01% |
5,400
+5,000
| +1,250% | +$22.4K |
|
|
MEME
7007
Roundhill Meme Stock ETF
MEME
$16.1M
| $22.3K | ﹤0.01% |
2,320
-3,169
| -58% | -$29.6K |
|
7008
PUT
AmpliTech
AMPG
$101M
| $22.3K | ﹤0.01% |
3,200
+2,400
| +300% | +$10K |
|
7009
PUT
Children's Place
PLCE
$62.5M
| $22.3K | ﹤0.01% |
7,300
-21,200
| -74% | -$71.9K |
|
7010
Provident Financial Services
PFS
$3.09B
| $22.2K | ﹤0.01% |
+941
| New | +$21.1K |
|
7011
Alight
ALIT
$398M
| $22.2K | ﹤0.01% |
1,985
-19,465
| -91% | -$275K |
|
7012
PUT
Aviat Networks
AVNW
$253M
| $22.2K | ﹤0.01% |
+1,000
| New | +$19.6K |
|
|
PSTL
7013
PUT
Postal Realty Trust
PSTL
$717M
| $22.2K | ﹤0.01% |
900
-100
| -10% | -$2.23K |
|
7014
TTEC Holdings
TTEC
$68M
| $22.2K | ﹤0.01% |
11,428
+10,593
| +1,269% | +$27.4K |
|
|
RYZ
7015
CALL
Ryerson Holding Corp
RYZ
$1.37B
| $22.1K | ﹤0.01% |
900
-3,000
| -77% | -$79.3K |
|
7016
Astec Industries
ASTE
$1.02B
| $22.1K | ﹤0.01% |
361
-12
| -3% | -$662 |
|
7017
Gogo Inc
GOGO
$385M
| $22.1K | ﹤0.01% |
7,123
-5,474
| -43% | -$22.3K |
|
7018
PUT
Bitwise Crypto Industry Innovators ETF
BITQ
$447M
| $22.1K | ﹤0.01% |
900
+800
| +800% | +$20.2K |
|
|
WNTR
7019
YieldMax MSTR Short Option Income Strategy ETF
WNTR
$61.3M
| $22K | ﹤0.01% |
716
-1,065
| -60% | -$27.9K |
|
7020
PUT
Franklin International Core Dividend Tilt Index ETF
DIVI
$2.77B
| $22K | ﹤0.01% |
400
-500
| -56% | -$21.2K |
|
7021
PUT
Cricut
CRCT
$1.16B
| $21.9K | ﹤0.01% |
+5,000
| New | +$21.4K |
|
|
AHRT
7022
CALL
AH Realty Trust
AHRT
$493M
| $21.9K | ﹤0.01% |
3,100
-10,500
| -77% | -$67.4K |
|
7023
Digimarc Corp
DMRC
$119M
| $21.9K | ﹤0.01% |
2,665
-120
| -4% | -$1.13K |
|
7024
PUT
Westlake Corp
WLK
$9.56B
| $21.9K | ﹤0.01% |
300
-4,900
| -94% | -$478K |
|
7025
SITE Centers
SITC
$151M
| $21.9K | ﹤0.01% |
5,510
+2,015
| +58% | +$10.5K |
|
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.