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 | |
|---|---|---|---|---|---|---|
4926
iShares Core S&P US Growth ETF
IUSG
$34B
| $168K | ﹤0.01% |
894
+171
| +24% | +$30.9K |
|
4927
CALL
East-West Bancorp
EWBC
$17.2B
| $168K | ﹤0.01% |
1,300
+300
| +30% | +$36.9K |
|
4928
CALL
Larimar Therapeutics
LRMR
$326M
| $168K | ﹤0.01% |
55,000
-131,900
| -71% | -$524K |
|
4929
Patrick Industries
PATK
$2.22B
| $168K | ﹤0.01% |
+1,867
| New | +$178K |
|
4930
PUT
James Hardie Industries
JHX
$14.6B
| $168K | ﹤0.01% |
6,400
-10,600
| -62% | -$233K |
|
4931
PUT
Laser Photonics
LASE
$51.1M
| $167K | ﹤0.01% |
101,400
+101,200
| +50,600% | +$139K |
|
4932
Roundhill Daily 2X Long Magnificent Seven ETF
MAGX
$65.7M
| $167K | ﹤0.01% |
+3,269
| New | +$179K |
|
4933
PUT
Canadian National Railway
CNI
$72.8B
| $167K | ﹤0.01% |
1,400
-900
| -39% | -$102K |
|
4934
PUT
CBIZ
CBZ
$3B
| $167K | ﹤0.01% |
5,200
| – | – |
|
4935
PUT
First Internet Bancorp
INBK
$228M
| $167K | ﹤0.01% |
6,000
+5,600
| +1,400% | +$136K |
|
4936
Qorvo
QRVO
$10.3B
| $166K | ﹤0.01% |
+1,785
| New | +$165K |
|
4937
CALL
Alto Ingredients
ALTO
$282M
| $166K | ﹤0.01% |
29,200
-19,200
| -40% | -$98K |
|
|
GRMN
4938
CALL
Garmin
GRMN
$56B
| $166K | ﹤0.01% |
700
-9,100
| -93% | -$2.21M |
|
4939
PagerDuty
PD
$1.18B
| $166K | ﹤0.01% |
+17,224
| New | +$130K |
|
|
ADAM
4940
PUT
Adamas Trust
ADAM
$713M
| $166K | ﹤0.01% |
17,700
+12,200
| +222% | +$105K |
|
|
TRON
4941
PUT
Tron Inc
TRON
$650M
| $166K | ﹤0.01% |
103,100
-9,700
| -9% | -$19.6K |
|
4942
PUT
Consolidated Edison
ED
$38.2B
| $166K | ﹤0.01% |
1,500
-2,200
| -59% | -$239K |
|
4943
CALL
Frequency Electronics
FEIM
$949M
| $166K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$142K |
|
4944
Forward Air
FWRD
$507M
| $166K | ﹤0.01% |
12,270
-5,329
| -30% | -$79.4K |
|
4945
Kingstone Companies
KINS
$259M
| $165K | ﹤0.01% |
8,686
-5,905
| -40% | -$95.2K |
|
4946
CALL
NeoGenomics
NEO
$2.41B
| $165K | ﹤0.01% |
11,300
+5,000
| +79% | +$48.2K |
|
4947
PUT
Triple Flag Precious Metals
TFPM
$6.4B
| $165K | ﹤0.01% |
5,500
-7,100
| -56% | -$228K |
|
4948
CALL
Baytex Energy
BTE
$3.13B
| $165K | ﹤0.01% |
41,200
+3,900
| +10% | +$18K |
|
4949
CALL
GeneDx Holdings
WGS
$2.26B
| $165K | ﹤0.01% |
2,400
-900
| -27% | -$51.1K |
|
|
4950
PUT
GeneDx Holdings
WGS
$2.26B
| $165K | ﹤0.01% |
2,400
+1,300
| +118% | +$73.9K |
|
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.