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 | |
|---|---|---|---|---|---|---|
2501
Trade Desk
TTD
$5.96B
| $1.29M | ﹤0.01% |
71,572
-54,961
| -43% | -$1.17M |
|
2502
CALL
Becton Dickinson
BDX
$50.1B
| $1.29M | ﹤0.01% |
9,700
-3,500
| -27% | -$523K |
|
|
XE
2503
CALL
X-Energy Inc
XE
$4.33B
| $1.29M | ﹤0.01% |
+70,300
| New | +$1.82M |
|
2504
Amdocs
DOX
$6.03B
| $1.29M | ﹤0.01% |
25,537
+13,255
| +108% | +$813K |
|
2505
CALL
Crescent Energy
CRGY
$4.34B
| $1.29M | ﹤0.01% |
131,300
-261,600
| -67% | -$3.2M |
|
|
KDK
2506
CALL
Kodiak AI
KDK
$488M
| $1.29M | ﹤0.01% |
253,800
+23,700
| +10% | +$177K |
|
2507
CALL
Magnite
MGNI
$3.44B
| $1.28M | ﹤0.01% |
67,500
+40,400
| +149% | +$579K |
|
2508
PUT
Neurocrine Biosciences
NBIX
$14.1B
| $1.28M | ﹤0.01% |
7,600
-800
| -10% | -$119K |
|
2509
PUT
L3Harris
LHX
$44.3B
| $1.28M | ﹤0.01% |
4,400
-15,200
| -78% | -$4.83M |
|
2510
CALL
Argan
AGX
$5.11B
| $1.28M | ﹤0.01% |
1,600
-1,100
| -41% | -$732K |
|
|
VSXY
2511
PUT
Victoria's Secret
VSXY
$6.61B
| $1.28M | ﹤0.01% |
15,300
+4,400
| +40% | +$264K |
|
2512
PUT
Floor & Decor
FND
$5.01B
| $1.28M | ﹤0.01% |
21,500
+1,100
| +5% | +$55.7K |
|
|
OBE
2513
CALL
Obsidian Energy
OBE
$713M
| $1.28M | ﹤0.01% |
156,900
+78,600
| +100% | +$882K |
|
2514
CALL
Concrete Pumping Holdings
BBCP
$492M
| $1.27M | ﹤0.01% |
+105,800
| New | +$908K |
|
2515
CALL
Marriott Vacations Worldwide
VAC
$3.54B
| $1.27M | ﹤0.01% |
12,500
+2,700
| +28% | +$216K |
|
2516
PUT
Arch Capital
ACGL
$32.3B
| $1.27M | ﹤0.01% |
13,100
+5,100
| +64% | +$481K |
|
2517
VanEck Junior Gold Miners ETF
GDXJ
$8.94B
| $1.27M | ﹤0.01% |
+12,886
| New | +$1.49M |
|
2518
PUT
Veeco
VECO
$3.04B
| $1.27M | ﹤0.01% |
+16,700
| New | +$952K |
|
2519
Genius Sports
GENI
$1.72B
| $1.27M | ﹤0.01% |
+208,775
| New | +$1.08M |
|
|
SA
2520
CALL
Seabridge Gold
SA
$3.27B
| $1.26M | ﹤0.01% |
166,700
+36,200
| +28% | +$1.09M |
|
2521
CALL
Albertsons Companies
ACI
$5.66B
| $1.26M | ﹤0.01% |
93,400
+54,200
| +138% | +$868K |
|
2522
UBS Group
UBS
$152B
| $1.26M | ﹤0.01% |
25,447
-96,871
| -79% | -$4.41M |
|
2523
PUT
VICI Properties
VICI
$25.9B
| $1.26M | ﹤0.01% |
47,500
+21,200
| +81% | +$594K |
|
|
EUV
2524
Corgi Lithography & Semiconductor Photonics ETF
EUV
$454M
| $1.26M | ﹤0.01% |
+39,428
| New | +$1.1M |
|
2525
CALL
Xeris Biopharma Holdings
XERS
$1.66B
| $1.26M | ﹤0.01% |
159,100
+139,200
| +699% | +$889K |
|
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.