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 | |
|---|---|---|---|---|---|---|
3876
PUT
Breakwave Tanker Shipping ETF
BWET
$212M
| $402K | ﹤0.01% |
2,800
+2,600
| +1,300% | +$438K |
|
3877
CALL
OraSure Technologies
OSUR
$272M
| $401K | ﹤0.01% |
+90,000
| New | +$318K |
|
3878
CALL
Kodiak Sciences
KOD
$5.65B
| $401K | ﹤0.01% |
10,300
+3,900
| +61% | +$152K |
|
3879
Eaton
ETN
$168B
| $400K | ﹤0.01% |
939
+108
| +13% | +$43.6K |
|
3880
PUT
Avantor
AVTR
$10.3B
| $400K | ﹤0.01% |
40,400
+31,300
| +344% | +$269K |
|
3881
OneSpan
OSPN
$659M
| $400K | ﹤0.01% |
27,850
+26,456
| +1,898% | +$334K |
|
3882
PUT
Jack Henry & Associates
JKHY
$10.4B
| $399K | ﹤0.01% |
2,900
+2,400
| +480% | +$341K |
|
3883
CALL
Qualys
QLYS
$6.01B
| $399K | ﹤0.01% |
2,900
+2,600
| +867% | +$256K |
|
3884
PUT
Agilent Technologies
A
$49.4B
| $398K | ﹤0.01% |
3,000
+700
| +30% | +$85.3K |
|
3885
Park Hotels & Resorts
PK
$3.17B
| $398K | ﹤0.01% |
+27,962
| New | +$342K |
|
3886
CALL
RLJ Lodging Trust
RLJ
$1.69B
| $398K | ﹤0.01% |
33,600
+33,100
| +6,620% | +$310K |
|
3887
B2Gold
BTG
$6.98B
| $398K | ﹤0.01% |
106,363
+27,640
| +35% | +$127K |
|
3888
CALL
Rayonier Advanced Materials
RYAM
$551M
| $397K | ﹤0.01% |
50,500
-138,300
| -73% | -$1.25M |
|
3889
PUT
Incyte
INCY
$25.3B
| $397K | ﹤0.01% |
3,500
+2,200
| +169% | +$218K |
|
3890
Scotiabank
BNS
$113B
| $397K | ﹤0.01% |
+4,568
| New | +$360K |
|
3891
PUT
Crexendo
CXDO
$195M
| $397K | ﹤0.01% |
53,100
+37,100
| +232% | +$290K |
|
3892
Broadridge
BR
$18.6B
| $397K | ﹤0.01% |
2,896
+1,623
| +127% | +$245K |
|
3893
CALL
Pinnacle West Capital
PNW
$11.1B
| $396K | ﹤0.01% |
3,700
+2,900
| +363% | +$297K |
|
3894
CALL
Allogene Therapeutics
ALLO
$563M
| $396K | ﹤0.01% |
190,200
+163,200
| +604% | +$358K |
|
|
BDN
3895
PUT
Brandywine Realty Trust
BDN
$486M
| $395K | ﹤0.01% |
124,700
-5,400
| -4% | -$16.2K |
|
3896
Corpay
CPAY
$26B
| $395K | ﹤0.01% |
+1,186
| New | +$394K |
|
3897
PUT
Adient
ADNT
$1.32B
| $395K | ﹤0.01% |
21,500
+21,100
| +5,275% | +$451K |
|
3898
PUT
Huntsman Corp
HUN
$1.51B
| $395K | ﹤0.01% |
37,200
-31,900
| -46% | -$440K |
|
3899
Dynatrace
DT
$16.7B
| $395K | ﹤0.01% |
+8,993
| New | +$350K |
|
3900
Canadian National Railway
CNI
$73.2B
| $395K | ﹤0.01% |
+3,310
| New | +$377K |
|
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.