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 | |
|---|---|---|---|---|---|---|
426
CALL
Eaton
ETN
$171B
| $23.7M | 0.01% |
55,600
+14,800
| +36% | +$5.97M |
|
|
XYZ
427
PUT
Block Inc
XYZ
$45.9B
| $23.7M | 0.01% |
311,400
+4,500
| +1% | +$316K |
|
428
Palantir
PLTR
$456B
| $23.5M | 0.01% |
201,696
-29,596
| -13% | -$4.04M |
|
429
PUT
DoorDash
DASH
$83.8B
| $23.5M | 0.01% |
127,200
+39,900
| +46% | +$6.59M |
|
430
Applied Materials
AMAT
$385B
| $23.4M | 0.01% |
32,303
+20,546
| +175% | +$9.48M |
|
431
CALL
United Airlines
UAL
$37B
| $23.3M | 0.01% |
171,200
-1,002,600
| -85% | -$104M |
|
|
UCD
432
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $23.2M | 0.01% |
401,000
+75,800
| +23% | +$4.39M |
|
433
PUT
Accenture
ACN
$108B
| $23.2M | 0.01% |
186,100
+89,500
| +93% | +$15.5M |
|
434
Corning
GLW
$135B
| $23.1M | 0.01% |
90,456
+43,053
| +91% | +$7.83M |
|
435
PUT
Microchip Technology
MCHP
$42.7B
| $23.1M | 0.01% |
253,000
+42,100
| +20% | +$3.75M |
|
436
CALL
First Majestic Silver
AG
$9.37B
| $23M | 0.01% |
1,357,600
+21,300
| +2% | +$422K |
|
437
PUT
Silicon Laboratories
SLAB
$7.38B
| $22.8M | 0.01% |
104,500
+101,600
| +3,503% | +$22M |
|
438
PUT
ON Semiconductor
ON
$30.1B
| $22.7M | 0.01% |
239,700
+142,500
| +147% | +$14.6M |
|
439
CALL
Delta Air Lines
DAL
$55.9B
| $22.4M | 0.01% |
239,600
-315,900
| -57% | -$23.8M |
|
440
CALL
Rigetti Computing
RGTI
$5.56B
| $22.1M | 0.01% |
1,144,300
+381,800
| +50% | +$7.38M |
|
441
CALL
Celestica
CLS
$46.1B
| $22.1M | 0.01% |
60,500
-4,600
| -7% | -$1.73M |
|
442
PUT
Core Scientific
CORZ
$5.57B
| $22M | 0.01% |
859,700
-530,400
| -38% | -$12.5M |
|
443
PUT
Zscaler
ZS
$31.5B
| $21.9M | 0.01% |
155,300
+71,400
| +85% | +$9.95M |
|
444
PUT
Albemarle
ALB
$12.9B
| $21.9M | 0.01% |
162,300
-4,300
| -3% | -$758K |
|
|
OKLO
445
PUT
Oklo
OKLO
$7.08B
| $21.9M | 0.01% |
417,800
+122,500
| +41% | +$7.64M |
|
446
CALL
Halliburton
HAL
$27.3B
| $21.7M | 0.01% |
638,600
-112,800
| -15% | -$4.41M |
|
447
CALL
Enterprise Products Partners
EPD
$79.4B
| $21.7M | 0.01% |
589,500
-142,500
| -19% | -$5.38M |
|
|
B
448
PUT
Barrick Mining
B
$70.6B
| $21.5M | 0.01% |
584,500
-70,700
| -11% | -$2.9M |
|
449
CALL
Wolfspeed
WOLF
$1.46B
| $21.4M | 0.01% |
444,300
+114,100
| +35% | +$4.97M |
|
450
CALL
GE Aerospace
GE
$339B
| $21.4M | 0.01% |
57,200
-155,300
| -73% | -$48.6M |
|
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.