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 | |
|---|---|---|---|---|---|---|
3501
CALL
Kura Oncology
KURA
$944M
| $543K | ﹤0.01% |
49,500
-4,300
| -8% | -$40.6K |
|
|
ONIT
3502
Onity Group
ONIT
$246M
| $542K | ﹤0.01% |
13,644
-1,431
| -9% | -$56.5K |
|
3503
Equinix
EQIX
$99.8B
| $542K | ﹤0.01% |
520
-2,759
| -84% | -$2.95M |
|
3504
NetEase
NTES
$77.5B
| $541K | ﹤0.01% |
+4,223
| New | +$498K |
|
3505
CrowdStrike
CRWD
$265B
| $541K | ﹤0.01% |
+2,836
| New | +$403K |
|
3506
PUT
Kodiak Gas Services
KGS
$5.33B
| $541K | ﹤0.01% |
7,200
+4,800
| +200% | +$326K |
|
3507
PUT
Hycroft Mining Holding Corp
HYMC
$1.83B
| $541K | ﹤0.01% |
23,100
-26,500
| -53% | -$894K |
|
3508
PUT
Genworth Financial
GNW
$3.54B
| $540K | ﹤0.01% |
57,000
-1,300
| -2% | -$11.6K |
|
3509
Onto Innovation
ONTO
$14.2B
| $539K | ﹤0.01% |
+1,425
| New | +$403K |
|
3510
Evolv Technologies
EVLV
$842M
| $539K | ﹤0.01% |
92,936
-49,194
| -35% | -$308K |
|
|
EFC
3511
CALL
Ellington Financial
EFC
$1.57B
| $539K | ﹤0.01% |
39,600
+21,100
| +114% | +$279K |
|
3512
PUT
Murphy USA
MUSA
$9.56B
| $539K | ﹤0.01% |
1,000
+900
| +900% | +$489K |
|
3513
CALL
Huazhu Hotels Group
HTHT
$13.7B
| $538K | ﹤0.01% |
12,900
-400
| -3% | -$19.1K |
|
3514
CALL
Imperial Oil
IMO
$59.2B
| $538K | ﹤0.01% |
4,800
-4,600
| -49% | -$576K |
|
3515
Ziff Davis
ZD
$1.91B
| $537K | ﹤0.01% |
+10,258
| New | +$464K |
|
3516
CALL
Vera Therapeutics
VERA
$2.34B
| $536K | ﹤0.01% |
12,500
+1,400
| +13% | +$52.2K |
|
3517
iShares MSCI Global Silver and Metals Miners ETF
SLVP
$902M
| $536K | ﹤0.01% |
17,392
-106,544
| -86% | -$3.8M |
|
3518
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.1B
| $535K | ﹤0.01% |
+9,520
| New | +$515K |
|
3519
CALL
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $534K | ﹤0.01% |
7,600
-2,100
| -22% | -$192K |
|
3520
CALL
HEICO Corp Class A
HEI.A
$32.2B
| $534K | ﹤0.01% |
1,500
-16,600
| -92% | -$3.79M |
|
3521
Uranium Energy
UEC
$4.56B
| $534K | ﹤0.01% |
+50,114
| New | +$673K |
|
|
CMBT
3522
CALL
CMB.TECH NV
CMBT
$5.53B
| $533K | ﹤0.01% |
38,100
-20,200
| -35% | -$291K |
|
3523
CALL
Navios Maritime Partners
NMM
$2.61B
| $533K | ﹤0.01% |
7,600
-3,200
| -30% | -$229K |
|
3524
CALL
Immunome
IMNM
$2.46B
| $532K | ﹤0.01% |
25,100
+8,900
| +55% | +$190K |
|
3525
PUT
Corporacion America
CAAP
$4.26B
| $531K | ﹤0.01% |
21,100
+15,000
| +246% | +$386K |
|
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.