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 | |
|---|---|---|---|---|---|---|
526
PUT
Charter Communications
CHTR
$12.9B
| $17.3M | 0.01% |
121,600
+27,600
| +29% | +$4.61M |
|
527
CALL
SELLAS Life Sciences
SLS
$2.34B
| $17.3M | 0.01% |
1,169,800
-37,600
| -3% | -$260K |
|
|
CBRS
528
PUT
Cerebras Systems
CBRS
$49.1B
| $17.2M | 0.01% |
+77,900
| New | +$18.3M |
|
529
PUT
Interactive Brokers
IBKR
$40.4B
| $17.1M | 0.01% |
197,000
+6,600
| +3% | +$549K |
|
530
PUT
Intuit
INTU
$73.7B
| $17.1M | 0.01% |
65,500
+18,200
| +38% | +$6.34M |
|
531
CALL
Altria Group
MO
$115B
| $17.1M | 0.01% |
237,600
+31,700
| +15% | +$2.21M |
|
532
PUT
Affirm
AFRM
$24.1B
| $17.1M | 0.01% |
209,100
+18,300
| +10% | +$1.2M |
|
533
CALL
Trade Desk
TTD
$5.96B
| $17M | 0.01% |
941,800
-88,200
| -9% | -$1.87M |
|
534
CALL
Sea Limited
SE
$61B
| $17M | 0.01% |
177,400
-85,000
| -32% | -$7.47M |
|
535
CALL
Dow Inc
DOW
$20.2B
| $17M | 0.01% |
620,900
-26,900
| -4% | -$976K |
|
536
PUT
General Motors
GM
$72.5B
| $16.9M | 0.01% |
219,600
-131,300
| -37% | -$10.3M |
|
537
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$163B
| $16.9M | 0.01% |
182,500
+16,300
| +10% | +$1.3M |
|
538
PUT
First Majestic Silver
AG
$9.37B
| $16.9M | 0.01% |
995,700
+68,200
| +7% | +$1.35M |
|
539
CALL
Riot Platforms
RIOT
$8.63B
| $16.9M | 0.01% |
615,900
-449,800
| -42% | -$10.1M |
|
540
CALL
Texas Pacific Land
TPL
$23.5B
| $16.8M | 0.01% |
38,500
+4,900
| +15% | +$1.99M |
|
541
PUT
NRG Energy
NRG
$21.1B
| $16.8M | 0.01% |
115,200
+89,400
| +347% | +$12.9M |
|
|
SHNY
542
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $16.8M | 0.01% |
947,500
-2,500
| -0.3% | -$44.2K |
|
543
CALL
Enphase Energy
ENPH
$4.28B
| $16.8M | 0.01% |
340,300
+166,200
| +95% | +$7.57M |
|
544
PUT
Booking.com
BKNG
$123B
| $16.6M | 0.01% |
93,200
-136,800
| -59% | -$23.3M |
|
545
CALL
Abbott
ABT
$175B
| $16.6M | 0.01% |
182,600
+88,500
| +94% | +$8.08M |
|
546
CALL
Tower Semiconductor
TSEM
$26.1B
| $16.5M | 0.01% |
63,300
+3,900
| +7% | +$934K |
|
547
PUT
Lucid Motors
LCID
$1.6B
| $16.4M | 0.01% |
2,456,100
+307,600
| +14% | +$1.99M |
|
548
CALL
SiriusXM
SIRI
$8.72B
| $16.4M | 0.01% |
555,800
+26,400
| +5% | +$709K |
|
|
ARCX
549
PUT
Tradr 2X Long ACHR Daily ETF
ARCX
$7.21M
| $16.4M | 0.01% |
425,900
+390,500
| +1,103% | +$6.9M |
|
550
CALL
D-Wave Quantum Inc
QBTS
$6.61B
| $16.4M | 0.01% |
681,600
+21,400
| +3% | +$469K |
|
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.