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 | |
|---|---|---|---|---|---|---|
501
PUT
Halliburton
HAL
$27.3B
| $18.3M | 0.01% |
539,600
-24,000
| -4% | -$938K |
|
502
PUT
GameStop
GME
$11.8B
| $18.3M | 0.01% |
1,144,300
-263,800
| -19% | -$6.05M |
|
503
CALL
BHP
BHP
$216B
| $18.3M | 0.01% |
219,700
-42,900
| -16% | -$3.56M |
|
504
CALL
Silicon Motion
SIMO
$9.37B
| $18.1M | 0.01% |
54,300
+7,200
| +15% | +$1.67M |
|
505
PUT
AT&T
T
$174B
| $18.1M | 0.01% |
873,300
-780,700
| -47% | -$19.4M |
|
506
PUT
Akamai
AKAM
$16.4B
| $18M | 0.01% |
152,600
-67,500
| -31% | -$8.4M |
|
507
CALL
Suncor Energy
SU
$79.8B
| $18M | 0.01% |
336,000
+144,300
| +75% | +$9.14M |
|
508
PUT
Equinix
EQIX
$99.5B
| $18M | 0.01% |
17,300
-5,200
| -23% | -$5.57M |
|
509
CALL
ON Semiconductor
ON
$30.1B
| $18M | 0.01% |
190,300
+9,600
| +5% | +$984K |
|
510
CALL
Microchip Technology
MCHP
$42.7B
| $17.9M | 0.01% |
196,000
-26,400
| -12% | -$2.35M |
|
511
CALL
Warner Bros
WBD
$77.4B
| $17.9M | 0.01% |
670,400
-146,500
| -18% | -$3.96M |
|
512
PUT
SLB Ltd
SLB
$76.5B
| $17.9M | 0.01% |
384,000
-238,900
| -38% | -$12.8M |
|
513
PUT
Southern Company
SO
$95.3B
| $17.8M | 0.01% |
186,000
+44,900
| +32% | +$4.23M |
|
514
CALL
Schwab US Broad Market ETF
SCHB
$44.8B
| $17.8M | 0.01% |
560,700
+179,200
| +47% | +$5.02M |
|
515
CALL
British American Tobacco
BTI
$120B
| $17.7M | 0.01% |
287,200
+79,100
| +38% | +$4.77M |
|
516
CALL
Unity
U
$18.3B
| $17.7M | 0.01% |
619,600
-352,700
| -36% | -$9.38M |
|
517
PUT
Amgen
AMGN
$224B
| $17.7M | 0.01% |
48,800
| – | – |
|
518
CALL
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$20.4M
| $17.7M | 0.01% |
5,060,600
+3,164,200
| +167% | +$59.7M |
|
519
PUT
HP
HPQ
$28.2B
| $17.5M | 0.01% |
799,900
+437,000
| +120% | +$9.67M |
|
520
CALL
Thermo Fisher Scientific
TMO
$250B
| $17.5M | 0.01% |
35,000
+13,100
| +60% | +$6.29M |
|
|
521
PUT
Thermo Fisher Scientific
TMO
$250B
| $17.5M | 0.01% |
35,000
-10,200
| -23% | -$4.9M |
|
522
CALL
Workday
WDAY
$45.7B
| $17.4M | 0.01% |
142,500
+10,000
| +8% | +$1.27M |
|
523
PUT
ConocoPhillips
COP
$153B
| $17.4M | 0.01% |
167,700
-55,400
| -25% | -$6.57M |
|
524
CALL
Cleveland-Cliffs
CLF
$6.95B
| $17.4M | 0.01% |
1,853,600
+10,200
| +0.6% | +$112K |
|
525
Qualcomm
QCOM
$216B
| $17.4M | 0.01% |
+93,992
| New | +$17.6M |
|
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.