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 | |
|---|---|---|---|---|---|---|
|
CRON
3326
Cronos Group
CRON
$1.26B
| $622K | ﹤0.01% |
223,728
+11,312
| +5% | +$30.3K |
|
3327
Deere & Co
DE
$186B
| $622K | ﹤0.01% |
+980
| New | +$568K |
|
3328
DexCom
DXCM
$32.7B
| $621K | ﹤0.01% |
9,225
+4,173
| +83% | +$278K |
|
3329
PUT
CenterPoint Energy
CNP
$24.1B
| $621K | ﹤0.01% |
14,100
+11,300
| +404% | +$484K |
|
|
EH
3330
EHang Holdings
EH
$334M
| $620K | ﹤0.01% |
94,714
-160,649
| -63% | -$1.5M |
|
3331
PUT
Manulife Financial
MFC
$72.1B
| $620K | ﹤0.01% |
15,300
+9,100
| +147% | +$352K |
|
3332
Quest Diagnostics
DGX
$26.2B
| $620K | ﹤0.01% |
2,924
+2,328
| +391% | +$457K |
|
3333
CALL
Korn Ferry
KFY
$3.89B
| $619K | ﹤0.01% |
+9,300
| New | +$629K |
|
|
ORBX
3334
Global X Space Tech ETF
ORBX
$39.1M
| $618K | ﹤0.01% |
+11,377
| New | +$663K |
|
3335
Deckers Outdoor
DECK
$10.7B
| $618K | ﹤0.01% |
6,228
-971
| -13% | -$102K |
|
3336
Doximity
DOCS
$4.67B
| $617K | ﹤0.01% |
+29,752
| New | +$658K |
|
3337
CALL
Ryman Hospitality Properties
RHP
$8.42B
| $617K | ﹤0.01% |
4,800
+3,300
| +220% | +$366K |
|
3338
PUT
Western Alliance Bancorporation
WAL
$8.35B
| $617K | ﹤0.01% |
7,500
-14,100
| -65% | -$1.11M |
|
3339
Denali Therapeutics
DNLI
$3.35B
| $616K | ﹤0.01% |
23,952
+11,637
| +94% | +$239K |
|
3340
CEVA Inc
CEVA
$977M
| $616K | ﹤0.01% |
+13,055
| New | +$462K |
|
3341
CALL
RXO
RXO
$3.32B
| $615K | ﹤0.01% |
22,300
+21,300
| +2,130% | +$470K |
|
3342
CALL
Sunoco
SUN
$14.1B
| $614K | ﹤0.01% |
9,100
-4,600
| -34% | -$306K |
|
3343
PUT
Ivanhoe Electric
IE
$1.7B
| $613K | ﹤0.01% |
63,800
-96,100
| -60% | -$1.21M |
|
3344
VanEck Oil Refiners ETF
CRAK
$615M
| $612K | ﹤0.01% |
13,275
+9,835
| +286% | +$474K |
|
3345
PUT
Globalstar
GSAT
$10.7B
| $610K | ﹤0.01% |
7,500
-4,200
| -36% | -$338K |
|
3346
Citizens Financial Group
CFG
$27.3B
| $609K | ﹤0.01% |
+8,695
| New | +$561K |
|
3347
CALL
Nice
NICE
$6.39B
| $609K | ﹤0.01% |
6,700
-1,700
| -20% | -$165K |
|
3348
Vanguard Energy ETF
VDE
$10.5B
| $608K | ﹤0.01% |
4,052
+1,212
| +43% | +$196K |
|
3349
CALL
RingCentral
RNG
$6.36B
| $608K | ﹤0.01% |
15,600
+600
| +4% | +$24.2K |
|
3350
PUT
Ironwood Pharmaceuticals
IRWD
$681M
| $606K | ﹤0.01% |
144,000
+34,400
| +31% | +$133K |
|
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.