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 | |
|---|---|---|---|---|---|---|
4851
PUT
Procore
PCOR
$7.53B
| $179K | ﹤0.01% |
4,400
+4,300
| +4,300% | +$213K |
|
4852
CALL
Abeona Therapeutics
ABEO
$295M
| $179K | ﹤0.01% |
28,900
-31,400
| -52% | -$172K |
|
|
BORR
4853
CALL
Borr Drilling
BORR
$1.21B
| $178K | ﹤0.01% |
43,200
-18,400
| -30% | -$99.3K |
|
4854
First Watch Restaurant Group
FWRG
$641M
| $178K | ﹤0.01% |
13,840
+8,238
| +147% | +$96.6K |
|
4855
Ginkgo Bioworks
DNA
$805M
| $178K | ﹤0.01% |
17,995
+10,521
| +141% | +$88K |
|
4856
CALL
Amneal Pharmaceuticals
AMRX
$7.04B
| $178K | ﹤0.01% |
10,300
+9,200
| +836% | +$126K |
|
|
ROBN
4857
T-Rex 2X Long HOOD Daily Target ETF
ROBN
$110M
| $178K | ﹤0.01% |
5,900
-1,335
| -18% | -$30.9K |
|
|
AIRO
4858
AIRO Group Holdings
AIRO
$214M
| $178K | ﹤0.01% |
24,075
+10,977
| +84% | +$85.9K |
|
4859
ReNew
RNW
$2.5B
| $178K | ﹤0.01% |
28,415
+22,789
| +405% | +$128K |
|
4860
Future Fuel
FF
$222M
| $177K | ﹤0.01% |
39,251
-46,033
| -54% | -$198K |
|
|
VOYG
4861
PUT
Voyager Technologies
VOYG
$1.88B
| $177K | ﹤0.01% |
5,500
-1,600
| -23% | -$55.4K |
|
4862
PUT
FTAI Infrastructure
FIP
$333M
| $177K | ﹤0.01% |
38,200
+13,800
| +57% | +$68.7K |
|
4863
CALL
Urban Outfitters
URBN
$6.48B
| $177K | ﹤0.01% |
2,500
-3,700
| -60% | -$264K |
|
4864
Pentair
PNR
$8.53B
| $177K | ﹤0.01% |
2,310
+2,244
| +3,400% | +$178K |
|
4865
PUT
Genuine Parts
GPC
$17.5B
| $177K | ﹤0.01% |
1,500
-12,500
| -89% | -$1.3M |
|
4866
CALL
Ultragenyx Pharmaceutical
RARE
$1.51B
| $177K | ﹤0.01% |
5,300
-10,200
| -66% | -$253K |
|
4867
Autohome
ATHM
$2.44B
| $177K | ﹤0.01% |
9,298
+9,014
| +3,174% | +$163K |
|
4868
CALL
Steven Madden
SHOO
$3.3B
| $177K | ﹤0.01% |
4,200
-1,400
| -25% | -$56.6K |
|
4869
PUT
Hess Midstream
HESM
$4.83B
| $177K | ﹤0.01% |
4,700
-4,500
| -49% | -$173K |
|
4870
Crexendo
CXDO
$195M
| $177K | ﹤0.01% |
23,655
+21,877
| +1,230% | +$171K |
|
|
VSNT
4871
PUT
Versant Media Group
VSNT
$4.48B
| $176K | ﹤0.01% |
4,900
-5,100
| -51% | -$205K |
|
4872
Danaher
DHR
$159B
| $176K | ﹤0.01% |
+926
| New | +$168K |
|
4873
PUT
The Ensign Group
ENSG
$10.2B
| $176K | ﹤0.01% |
+1,100
| New | +$194K |
|
4874
PUT
Murphy Oil
MUR
$5.15B
| $176K | ﹤0.01% |
5,400
-6,300
| -54% | -$241K |
|
4875
CALL
Arbutus Biopharma
ABUS
$929M
| $176K | ﹤0.01% |
36,600
-22,000
| -38% | -$96.6K |
|
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.