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 | |
|---|---|---|---|---|---|---|
451
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$113M
| $21.3M | 0.01% |
560,800
+231,000
| +70% | +$9M |
|
452
PUT
Ford
F
$50.7B
| $21.2M | 0.01% |
1,528,400
+254,300
| +20% | +$3.43M |
|
453
CALL
BlackBerry
BB
$4.82B
| $21.2M | 0.01% |
1,677,200
+1,062,200
| +173% | +$7.42M |
|
454
CALL
STMicroelectronics
STM
$46.3B
| $21.2M | 0.01% |
283,200
+118,900
| +72% | +$7.15M |
|
455
CALL
Fortinet
FTNT
$127B
| $21.2M | 0.01% |
138,000
-14,600
| -10% | -$1.69M |
|
456
SoFi Technologies
SOFI
$21.4B
| $21.2M | 0.01% |
1,181,860
+213,452
| +22% | +$3.62M |
|
457
PUT
Spotify
SPOT
$105B
| $21.2M | 0.01% |
46,100
-25,600
| -36% | -$12.2M |
|
458
CALL
Plains GP Holdings
PAGP
$5.26B
| $21.2M | 0.01% |
871,700
+314,700
| +56% | +$7.55M |
|
459
CALL
S&P Global
SPGI
$119B
| $21.1M | 0.01% |
51,700
+16,500
| +47% | +$6.97M |
|
|
QXO
460
CALL
QXO Inc
QXO
$12.9B
| $21.1M | 0.01% |
1,218,300
+669,200
| +122% | +$12.5M |
|
461
CALL
Rio Tinto
RIO
$154B
| $21M | 0.01% |
221,400
+900
| +0.4% | +$91.2K |
|
462
CALL
Booking.com
BKNG
$123B
| $21M | 0.01% |
117,800
-242,200
| -67% | -$41.3M |
|
|
463
Advanced Micro Devices
AMD
$1.03T
| $21M | 0.01% |
36,092
-224,530
| -86% | -$92.1M |
|
464
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$240M
| $20.7M | 0.01% |
585,000
+2,600
| +0.4% | +$130K |
|
465
CALL
NIO
NIO
$8.97B
| $20.4M | 0.01% |
4,039,900
-4,841,300
| -55% | -$28.2M |
|
466
PUT
Vale
VALE
$57.9B
| $20.4M | 0.01% |
1,358,100
-148,300
| -10% | -$2.42M |
|
|
467
PUT
NIO
NIO
$8.97B
| $20.4M | 0.01% |
4,034,600
+820,000
| +26% | +$4.78M |
|
468
CALL
Albemarle
ALB
$12.9B
| $20.3M | 0.01% |
150,300
-24,900
| -14% | -$4.39M |
|
469
CALL
AXT Inc
AXTI
$5.18B
| $20.2M | 0.01% |
280,700
+174,600
| +165% | +$15.7M |
|
470
PUT
KKR & Co
KKR
$86.8B
| $20.2M | 0.01% |
219,700
-86,900
| -28% | -$8.43M |
|
|
EA
471
CALL
DELISTED
Electronic Arts
EA
| $20.1M | 0.01% |
97,900
+38,000
| +63% | +$7.7M |
|
472
CALL
Applied Digital
APLD
$7.46B
| $20M | 0.01% |
537,100
-221,400
| -29% | -$8.54M |
|
473
PUT
Okta
OKTA
$34.1B
| $20M | 0.01% |
146,300
-30,100
| -17% | -$2.83M |
|
474
PUT
Deere & Co
DE
$186B
| $19.9M | 0.01% |
31,300
-1,000
| -3% | -$579K |
|
475
PUT
DigitalOcean
DOCN
$16.4B
| $19.7M | 0.01% |
125,600
-1,200
| -0.9% | -$162K |
|
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.