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 | |
|---|---|---|---|---|---|---|
4026
CALL
LifeMD
LFMD
$141M
| $354K | ﹤0.01% |
85,700
+71,800
| +517% | +$317K |
|
4027
CALL
Neurocrine Biosciences
NBIX
$14.3B
| $354K | ﹤0.01% |
2,100
+1,400
| +200% | +$208K |
|
4028
PUT
Sagimet Biosciences
SGMT
$618M
| $353K | ﹤0.01% |
45,700
+14,800
| +48% | +$101K |
|
|
TSSI
4029
PUT
TSS Inc
TSSI
$274M
| $353K | ﹤0.01% |
28,700
+28,300
| +7,075% | +$381K |
|
|
XOMA
4030
PUT
DELISTED
Xoma
XOMA
| $353K | ﹤0.01% |
8,300
+8,100
| +4,050% | +$328K |
|
4031
Shift4
FOUR
$2.92B
| $352K | ﹤0.01% |
+7,246
| New | +$313K |
|
|
AMTM
4032
Amentum Holdings
AMTM
$4.52B
| $351K | ﹤0.01% |
+17,003
| New | +$411K |
|
4033
PUT
Alliant Energy
LNT
$16.4B
| $351K | ﹤0.01% |
4,600
+3,500
| +318% | +$255K |
|
4034
Bath & Body Works
BBWI
$3.26B
| $350K | ﹤0.01% |
15,145
-19,159
| -56% | -$367K |
|
4035
Antero Resources
AR
$10.6B
| $350K | ﹤0.01% |
9,958
-85,269
| -90% | -$3.14M |
|
|
PEW
4036
CALL
GrabAGun Digital Holdings
PEW
$62.3M
| $350K | ﹤0.01% |
153,400
-51,400
| -25% | -$143K |
|
4037
CALL
Williams-Sonoma
WSM
$27.2B
| $350K | ﹤0.01% |
1,500
-20,600
| -93% | -$4.08M |
|
4038
CALL
Churchill Downs
CHDN
$5.28B
| $350K | ﹤0.01% |
+3,900
| New | +$350K |
|
4039
CALL
Immuneering
IMRX
$269M
| $349K | ﹤0.01% |
70,000
+49,200
| +237% | +$249K |
|
4040
PUT
Zura Bio
ZURA
$393M
| $349K | ﹤0.01% |
59,200
-73,300
| -55% | -$349K |
|
4041
Eledon Pharmaceuticals
ELDN
$215M
| $349K | ﹤0.01% |
+88,597
| New | +$322K |
|
|
ALM
4042
Almonty Industries
ALM
$3.81B
| $349K | ﹤0.01% |
21,079
+18,135
| +616% | +$346K |
|
4043
PUT
XPO
XPO
$20.7B
| $349K | ﹤0.01% |
1,700
-2,300
| -58% | -$487K |
|
4044
CALL
Prairie Operating Co
PROP
$45.9M
| $349K | ﹤0.01% |
483,500
+445,500
| +1,172% | +$480K |
|
4045
PUT
Supernus Pharmaceuticals
SUPN
$2.6B
| $349K | ﹤0.01% |
7,500
+1,000
| +15% | +$48K |
|
4046
CALL
RenaissanceRe
RNR
$13.5B
| $349K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$301K |
|
4047
CALL
Crown Castle
CCI
$28.5B
| $348K | ﹤0.01% |
4,600
+1,000
| +28% | +$87.8K |
|
4048
PUT
RF Industries
RFIL
$85.9M
| $348K | ﹤0.01% |
16,400
+4,400
| +37% | +$71.2K |
|
4049
CALL
Synaptics
SYNA
$3.98B
| $348K | ﹤0.01% |
2,800
-2,000
| -42% | -$226K |
|
4050
Herc Holdings
HRI
$4.48B
| $348K | ﹤0.01% |
2,425
-1,668
| -41% | -$215K |
|
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.