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 | Held Since | |
|---|---|---|---|---|---|---|---|
7076
PUT
Talphera
TLPH
$56.1M
| $20.7K | ﹤0.01% |
20,100
+17,600
| +704% | +$15K |
2025 Q4
2 quarters
|
|
7077
CALL
StepStone Group
STEP
$3.46B
| $20.7K | ﹤0.01% |
500
+200
| +67% | +$9.9K |
2026 Q1
1 quarter
|
|
7078
Kelly Services Class A
KELYA
$583M
| $20.7K | ﹤0.01% |
1,683
-20,650
| -92% | -$215K |
2026 Q1
1 quarter
|
|
7079
Douglas Elliman
DOUG
$145M
| $20.7K | ﹤0.01% |
11,674
+3,216
| +38% | +$5.77K |
2025 Q1
5 quarters
|
|
7080
CALL
Insperity
NSP
$2.08B
| $20.7K | ﹤0.01% |
500
+300
| +150% | +$9.8K |
2025 Q2
4 quarters
|
|
|
7081
PUT
Insperity
NSP
$2.08B
| $20.7K | ﹤0.01% |
500
| – | – |
2025 Q2
4 quarters
|
|
7082
Dorchester Minerals
DMLP
$1.5B
| $20.7K | ﹤0.01% |
+818
| New | +$22.3K |
2026 Q2
0 quarters
|
|
7083
MidCap Financial Investment
MFIC
$690M
| $20.6K | ﹤0.01% |
+2,047
| New | +$22.5K |
2026 Q2
0 quarters
|
|
7084
WhiteFiber Inc
WYFI
$388M
| $20.6K | ﹤0.01% |
+531
| New | +$12.8K |
2026 Q2
0 quarters
|
|
7085
PUT
American Century Diversified Corporate Bond ETF
KORP
$952M
| $20.6K | ﹤0.01% |
200
-500
| -71% | -$23.4K |
2022 Q3
15 quarters
|
|
7086
CALL
Waystar Holding Corp
WAY
$5.53B
| $20.5K | ﹤0.01% |
1,000
-2,000
| -67% | -$42.1K |
2024 Q4
6 quarters
|
|
7087
CALL
Andersons Inc
ANDE
$2.21B
| $20.5K | ﹤0.01% |
300
-300
| -50% | -$21.8K |
2025 Q4
2 quarters
|
|
7088
Lexicon Pharmaceuticals
LXRX
$632M
| $20.5K | ﹤0.01% |
+8,540
| New | +$16.6K |
2026 Q2
0 quarters
|
|
7089
Tradr 2X Long BE Daily ETF
BEX
$110M
| $20.5K | ﹤0.01% |
342
+302
| +755% | +$15.9K |
2026 Q1
1 quarter
|
|
7090
Kimball Electronics
KE
$590M
| $20.5K | ﹤0.01% |
+799
| New | +$20.5K |
2026 Q2
0 quarters
|
|
7091
T-REX 2X Long SPCX Daily Target ETF
SPAX
$31.9M
| $20.4K | ﹤0.01% |
+1,324
| New | +$21.3K |
2026 Q2
0 quarters
|
|
7092
Nu Skin
NUS
$233M
| $20.4K | ﹤0.01% |
+3,863
| New | +$24.7K |
2026 Q2
0 quarters
|
|
7093
PUT
CareCloud
CCLD
$75.2M
| $20.4K | ﹤0.01% |
9,600
+300
| +3% | +$776 |
2025 Q2
4 quarters
|
|
7094
PUT
WisdomTree High Income Laddered Municipal Fund
WTMY
$4.89M
| $20.4K | ﹤0.01% |
400
-1,000
| -71% | -$25.4K |
2025 Q2
4 quarters
|
|
7095
CALL
Vontier
VNT
$4.65B
| $20.3K | ﹤0.01% |
700
| – | – |
2026 Q1
1 quarter
|
|
7096
PUT
Green Dot
GDOT
$704M
| $20.3K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$17.5K |
2025 Q2
4 quarters
|
|
7097
CALL
EastGroup Properties
EGP
$10.7B
| $20.3K | ﹤0.01% |
+100
| New | +$20K |
2026 Q2
0 quarters
|
|
7098
CALL
Zurn Elkay Water Solutions
ZWS
$8.05B
| $20.2K | ﹤0.01% |
400
+200
| +100% | +$9.8K |
2026 Q1
1 quarter
|
|
7099
Dimensional US Marketwide Value ETF
DFUV
$15.5B
| $20.2K | ﹤0.01% |
+367
| New | +$19.3K |
2026 Q2
0 quarters
|
|
7100
PUT
Eagle Nuclear Energy Corp
NUCL
$141M
| $20.2K | ﹤0.01% |
+2,100
| New | +$21.2K |
2026 Q2
0 quarters
|
|
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.