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 | |
|---|---|---|---|---|---|---|
|
VLD
3476
PUT
DELISTED
Velo3D, Inc.
VLD
| $555K | ﹤0.01% |
31,600
+15,700
| +99% | +$276K |
|
3477
PUT
CPI Aerostructures
CVU
$67.3M
| $554K | ﹤0.01% |
106,800
+11,300
| +12% | +$47.9K |
|
3478
Anterix
ATEX
$1.6B
| $554K | ﹤0.01% |
5,377
-38,373
| -88% | -$2.25M |
|
3479
PUT
Timken Company
TKR
$8.09B
| $552K | ﹤0.01% |
+3,800
| New | +$457K |
|
|
ORBS
3480
CALL
Eightco Holdings
ORBS
$499M
| $552K | ﹤0.01% |
793,900
+379,800
| +92% | +$342K |
|
3481
Digital Realty Trust
DLR
$65.7B
| $551K | ﹤0.01% |
+3,068
| New | +$588K |
|
3482
CALL
Perrigo
PRGO
$2.1B
| $551K | ﹤0.01% |
53,000
+45,300
| +588% | +$499K |
|
3483
Clearwater Paper
CLW
$321M
| $551K | ﹤0.01% |
35,112
+13,060
| +59% | +$197K |
|
|
BELFB
3484
Bel Fuse Inc Class B
BELFB
$3.58B
| $550K | ﹤0.01% |
+1,651
| New | +$446K |
|
3485
PUT
Nordic American Tanker
NAT
$1.65B
| $550K | ﹤0.01% |
99,200
-93,500
| -49% | -$529K |
|
3486
CALL
Cheesecake Factory
CAKE
$5.23B
| $549K | ﹤0.01% |
6,900
-8,600
| -55% | -$557K |
|
3487
PUT
Mattel
MAT
$3.81B
| $548K | ﹤0.01% |
39,500
+24,400
| +162% | +$357K |
|
3488
CALL
Grupo Cibest SA
CIB
$21.8B
| $548K | ﹤0.01% |
6,900
+5,700
| +475% | +$412K |
|
3489
PUT
Huntington Bancshares
HBAN
$30.9B
| $548K | ﹤0.01% |
30,900
+10,800
| +54% | +$178K |
|
3490
PUT
Richtech Robotics
RR
$353M
| $548K | ﹤0.01% |
259,600
+1,400
| +0.5% | +$3.4K |
|
3491
PUT
M&T Bank
MTB
$31.8B
| $547K | ﹤0.01% |
2,300
-10,000
| -81% | -$2.19M |
|
3492
Red Violet
RDVT
$1.26B
| $547K | ﹤0.01% |
8,578
+8,364
| +3,908% | +$396K |
|
3493
CALL
Syndax Pharmaceuticals
SNDX
$1.59B
| $547K | ﹤0.01% |
25,000
+13,300
| +114% | +$277K |
|
3494
PUT
C.H. Robinson
CHRW
$17.3B
| $546K | ﹤0.01% |
2,900
-3,200
| -52% | -$568K |
|
3495
Broadwind
BWEN
$99.8M
| $546K | ﹤0.01% |
113,080
+109,150
| +2,777% | +$362K |
|
3496
PUT
PPG Industries
PPG
$23.8B
| $546K | ﹤0.01% |
4,500
-2,700
| -38% | -$301K |
|
3497
SiTime
SITM
$19.7B
| $545K | ﹤0.01% |
731
-90
| -11% | -$56.7K |
|
3498
CALL
Melco Resorts & Entertainment
MLCO
$1.78B
| $545K | ﹤0.01% |
103,400
+16,000
| +18% | +$89.3K |
|
3499
ProShares UltraShort Bitcoin ETF
SBIT
$130M
| $544K | ﹤0.01% |
7,818
-627
| -7% | -$31.5K |
|
|
YSS
3500
CALL
York Space Systems
YSS
$1.26B
| $544K | ﹤0.01% |
22,100
+5,100
| +30% | +$158K |
|
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.