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 | |
|---|---|---|---|---|---|---|
|
FISV
476
CALL
Fiserv Inc
FISV
$24.7B
| $19.7M | 0.01% |
401,900
+131,400
| +49% | +$7.34M |
|
477
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$442M
| $19.5M | 0.01% |
655,500
+136,850
| +26% | +$3.75M |
|
478
CALL
United Microelectronic
UMC
$61B
| $19.4M | 0.01% |
713,900
+575,900
| +417% | +$9.84M |
|
479
PUT
STMicroelectronics
STM
$46.3B
| $19.4M | 0.01% |
258,800
+75,500
| +41% | +$4.54M |
|
480
CALL
Navitas Semiconductor
NVTS
$3.2B
| $19.3M | 0.01% |
1,078,200
+477,800
| +80% | +$9.12M |
|
481
CALL
Spotify
SPOT
$105B
| $19.2M | 0.01% |
41,900
-15,600
| -27% | -$7.44M |
|
482
PUT
Synopsys
SNPS
$81.6B
| $19.2M | 0.01% |
43,000
+25,000
| +139% | +$11.8M |
|
483
PUT
Cameco
CCJ
$38.4B
| $19.2M | 0.01% |
188,200
-43,800
| -19% | -$4.91M |
|
484
PUT
Strive Inc
ASST
$2.86B
| $19.1M | 0.01% |
1,729,900
-76,400
| -4% | -$1.13M |
|
485
CALL
Vodafone
VOD
$38.5B
| $19M | 0.01% |
1,438,700
+10,900
| +0.8% | +$165K |
|
486
PUT
JD.com
JD
$35.8B
| $19M | 0.01% |
745,500
+1,500
| +0.2% | +$44.2K |
|
487
Coinbase
COIN
$51.5B
| $18.9M | 0.01% |
+129,499
| New | +$23.4M |
|
488
CALL
Okta
OKTA
$34.1B
| $18.9M | 0.01% |
138,600
+56,200
| +68% | +$5.29M |
|
489
PUT
Dow Inc
DOW
$20.2B
| $18.9M | 0.01% |
690,700
-106,900
| -13% | -$3.88M |
|
490
PUT
Apollo Global Management
APO
$71.9B
| $18.9M | 0.01% |
159,500
-37,400
| -19% | -$4.7M |
|
491
CALL
Stanley Black & Decker
SWK
$13.8B
| $18.9M | 0.01% |
200,300
-10,900
| -5% | -$854K |
|
492
CALL
Capital One
COF
$123B
| $18.8M | 0.01% |
93,900
-38,500
| -29% | -$7.36M |
|
493
PUT
RTX Corp
RTX
$255B
| $18.8M | 0.01% |
99,000
-29,300
| -23% | -$5.37M |
|
494
PUT
Abbott
ABT
$175B
| $18.8M | 0.01% |
206,800
+121,500
| +142% | +$11.1M |
|
495
PUT
Futu Holdings
FUTU
$15.7B
| $18.8M | 0.01% |
200,100
+81,800
| +69% | +$10.5M |
|
496
PUT
AXT Inc
AXTI
$5.18B
| $18.7M | 0.01% |
260,100
+146,000
| +128% | +$13.1M |
|
497
CALL
Zscaler
ZS
$31.5B
| $18.5M | 0.01% |
130,900
+76,900
| +142% | +$10.7M |
|
498
CALL
Akamai
AKAM
$16.4B
| $18.5M | 0.01% |
156,200
+31,900
| +26% | +$3.97M |
|
499
CALL
ProShares Ultra S&P500
SSO
$9.03B
| $18.4M | 0.01% |
203,200
+34,400
| +20% | +$2.2M |
|
500
PUT
Avis
CAR
$3.83B
| $18.4M | 0.01% |
124,500
+106,200
| +580% | +$23.4M |
|
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.