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 | |
|---|---|---|---|---|---|---|
401
CALL
Veeva Systems
VEEV
$45.4B
| $25.6M | 0.02% |
144,300
+129,200
| +856% | +$21.3M |
|
402
CALL
AutoZone
AZO
$46.5B
| $25.6M | 0.02% |
8,000
-22,900
| -74% | -$76.1M |
|
403
CALL
MP Materials
MP
$8.7B
| $25.6M | 0.02% |
456,400
+13,600
| +3% | +$828K |
|
404
PUT
T-Mobile US
TMUS
$177B
| $25.6M | 0.02% |
152,400
+73,600
| +93% | +$13.9M |
|
405
CALL
Union Pacific
UNP
$163B
| $25.5M | 0.02% |
93,800
+58,100
| +163% | +$15.3M |
|
406
CALL
Rocket Companies
RKT
$34.5B
| $25.5M | 0.01% |
1,618,100
-931,900
| -37% | -$13.4M |
|
|
HUT
407
PUT
Hut 8
HUT
$11.9B
| $25.3M | 0.01% |
218,900
+30,900
| +16% | +$3M |
|
408
CALL
Fair Isaac
FICO
$18.6B
| $25.2M | 0.01% |
21,100
-4,500
| -18% | -$5.04M |
|
409
CALL
Philip Morris
PM
$297B
| $25M | 0.01% |
138,200
+28,600
| +26% | +$4.96M |
|
410
CALL
Blackstone
BX
$88.9B
| $24.9M | 0.01% |
211,900
-1,500
| -0.7% | -$180K |
|
|
TEM
411
CALL
Tempus AI
TEM
$15.4B
| $24.8M | 0.01% |
428,400
-92,000
| -18% | -$4.61M |
|
412
CALL
Oscar Health
OSCR
$9.14B
| $24.8M | 0.01% |
867,900
-218,800
| -20% | -$4.71M |
|
413
CALL
Zoom
ZM
$26.2B
| $24.7M | 0.01% |
286,700
+91,400
| +47% | +$8.64M |
|
414
PUT
Alcoa
AA
$11.3B
| $24.4M | 0.01% |
468,700
+41,400
| +10% | +$2.77M |
|
415
PUT
Applied Digital
APLD
$7.46B
| $24.4M | 0.01% |
654,400
+41,600
| +7% | +$1.61M |
|
416
CALL
Valero Energy
VLO
$111B
| $24.4M | 0.01% |
93,600
+9,100
| +11% | +$2.24M |
|
417
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$163B
| $24.3M | 0.01% |
246,600
+28,100
| +13% | +$2.24M |
|
418
CALL
Applied Optoelectronics
AAOI
$8.61B
| $24.1M | 0.01% |
162,800
+42,300
| +35% | +$6.88M |
|
419
CALL
Wynn Resorts
WYNN
$8.35B
| $24.1M | 0.01% |
248,200
-44,800
| -15% | -$4.62M |
|
|
BNY
420
PUT
Bank of New York Mellon
BNY
$102B
| $24M | 0.01% |
166,200
+118,800
| +251% | +$16.2M |
|
421
PUT
MongoDB
MDB
$33.1B
| $24M | 0.01% |
71,400
-5,800
| -8% | -$1.74M |
|
422
PUT
Intuitive Surgical
ISRG
$143B
| $24M | 0.01% |
60,300
+16,900
| +39% | +$7.38M |
|
423
GE Vernova
GEV
$255B
| $23.9M | 0.01% |
20,352
+3,451
| +20% | +$3.52M |
|
424
CALL
Cheniere Energy
LNG
$55.5B
| $23.8M | 0.01% |
99,600
-7,400
| -7% | -$1.84M |
|
425
PUT
Ciena
CIEN
$50.6B
| $23.8M | 0.01% |
48,500
+19,700
| +68% | +$10M |
|
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.