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 | |
|---|---|---|---|---|---|---|
3901
Toro Company
TTC
$9.19B
| $394K | ﹤0.01% |
+4,044
| New | +$376K |
|
3902
Alkami Technology
ALKT
$1.43B
| $393K | ﹤0.01% |
21,706
-40,575
| -65% | -$670K |
|
3903
Vanguard Morningstar Mega Cap Growth ETF
MGK
$34.5B
| $393K | ﹤0.01% |
+4,469
| New | +$381K |
|
3904
PUT
FLEX LNG
FLNG
$1.67B
| $393K | ﹤0.01% |
14,000
+10,700
| +324% | +$331K |
|
|
ORLA
3905
CALL
DELISTED
Orla Mining
ORLA
| $393K | ﹤0.01% |
40,100
-81,700
| -67% | -$1.09M |
|
3906
CALL
CryoPort
CYRX
$880M
| $392K | ﹤0.01% |
25,000
-15,000
| -38% | -$192K |
|
3907
PUT
Vaalco Energy
EGY
$606M
| $392K | ﹤0.01% |
77,200
-2,300
| -3% | -$13.3K |
|
3908
BBB Foods
TBBB
$6.45B
| $392K | ﹤0.01% |
9,410
+3,734
| +66% | +$143K |
|
3909
CALL
Willis Towers Watson
WTW
$27.1B
| $392K | ﹤0.01% |
+1,500
| New | +$401K |
|
3910
PUT
Patterson-UTI
PTEN
$4.14B
| $392K | ﹤0.01% |
42,700
-3,100
| -7% | -$34.6K |
|
3911
CALL
Orion
OEC
$332M
| $392K | ﹤0.01% |
59,100
-8,000
| -12% | -$57.5K |
|
3912
Exelixis
EXEL
$14.5B
| $392K | ﹤0.01% |
+7,198
| New | +$350K |
|
3913
Primoris Services
PRIM
$3.83B
| $392K | ﹤0.01% |
3,951
+838
| +27% | +$110K |
|
3914
PUT
PBF Energy
PBF
$8.82B
| $391K | ﹤0.01% |
8,600
-50,500
| -85% | -$2.1M |
|
3915
PUT
Halozyme
HALO
$12.8B
| $391K | ﹤0.01% |
5,000
+1,100
| +28% | +$75K |
|
3916
CALL
10x Genomics
TXG
$11.5B
| $391K | ﹤0.01% |
10,200
-25,200
| -71% | -$660K |
|
3917
PUT
Magnite
MGNI
$3.36B
| $391K | ﹤0.01% |
20,600
+5,000
| +32% | +$71.6K |
|
|
ORKA
3918
CALL
Oruka Therapeutics
ORKA
$5.57B
| $390K | ﹤0.01% |
+4,100
| New | +$273K |
|
|
JHG
3919
CALL
DELISTED
Janus Henderson
JHG
| $390K | ﹤0.01% |
7,500
-200
| -3% | -$10.3K |
|
3920
CALL
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1.03B
| $389K | ﹤0.01% |
13,600
-49,600
| -78% | -$1.59M |
|
|
HPP
3921
PUT
Hudson Pacific Properties
HPP
$624M
| $389K | ﹤0.01% |
25,600
-800
| -3% | -$8.77K |
|
|
OPRA
3922
PUT
Opera Ltd
OPRA
$1.55B
| $389K | ﹤0.01% |
19,600
-1,000
| -5% | -$17.7K |
|
3923
PUT
Ardelyx
ARDX
$880M
| $389K | ﹤0.01% |
76,200
+16,300
| +27% | +$99.5K |
|
3924
CALL
Hallador Energy
HNRG
$678M
| $388K | ﹤0.01% |
22,300
+7,200
| +48% | +$124K |
|
3925
PUT
ArcBest
ARCB
$2.84B
| $388K | ﹤0.01% |
2,700
+100
| +4% | +$13K |
|
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.