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 | |
|---|---|---|---|---|---|---|
1626
PUT
Nextpower Inc. Common Stock
NXT
$12.3B
| $3M | ﹤0.01% |
25,200
+4,500
| +22% | +$555K |
|
1627
CALL
American Water Works
AWK
$26B
| $3M | ﹤0.01% |
22,800
+16,200
| +245% | +$2.08M |
|
1628
PUT
Aurora
AUR
$12.1B
| $2.99M | ﹤0.01% |
438,100
+15,200
| +4% | +$93K |
|
1629
PUT
Wingstop
WING
$2.7B
| $2.98M | ﹤0.01% |
17,200
+12,000
| +231% | +$1.89M |
|
1630
PUT
AES
AES
$10.6B
| $2.98M | ﹤0.01% |
203,400
-85,300
| -30% | -$1.24M |
|
1631
PUT
Hudbay
HBM
$11.8B
| $2.98M | ﹤0.01% |
126,100
+81,000
| +180% | +$2.05M |
|
1632
CALL
AMC Entertainment Holdings
AMC
$2.62B
| $2.98M | ﹤0.01% |
1,566,600
-367,400
| -19% | -$632K |
|
1633
PUT
Bio-Techne
TECH
$11.4B
| $2.97M | ﹤0.01% |
42,100
+39,400
| +1,459% | +$2.13M |
|
1634
CALL
Capri Holdings
CPRI
$1.72B
| $2.97M | ﹤0.01% |
160,000
-156,600
| -49% | -$3.01M |
|
1635
CALL
Olin
OLN
$1.87B
| $2.97M | ﹤0.01% |
149,700
-69,600
| -32% | -$1.82M |
|
1636
PUT
Arbor Realty Trust
ABR
$752M
| $2.97M | ﹤0.01% |
547,300
+194,600
| +55% | +$1.26M |
|
1637
PUT
Hertz
HTZ
$620M
| $2.97M | ﹤0.01% |
1,309,300
+235,000
| +22% | +$1.28M |
|
1638
PUT
O'Reilly Automotive
ORLY
$69.7B
| $2.97M | ﹤0.01% |
32,200
+1,500
| +5% | +$137K |
|
1639
CALL
Digital Realty Trust
DLR
$66.3B
| $2.96M | ﹤0.01% |
16,500
+3,600
| +28% | +$689K |
|
1640
CALL
Coca-Cola Europacific Partners
CCEP
$44.8B
| $2.96M | ﹤0.01% |
29,600
+7,000
| +31% | +$667K |
|
1641
Blackstone
BX
$88.9B
| $2.96M | ﹤0.01% |
25,133
+19,600
| +354% | +$2.36M |
|
1642
Sanmina
SANM
$12B
| $2.95M | ﹤0.01% |
+11,674
| New | +$2.56M |
|
1643
PUT
Ball Corp
BALL
$15B
| $2.95M | ﹤0.01% |
47,300
+31,900
| +207% | +$1.88M |
|
1644
PUT
Kroger
KR
$34.7B
| $2.95M | ﹤0.01% |
53,100
-103,300
| -66% | -$6.74M |
|
1645
Champion Homes
SKY
$4.76B
| $2.94M | ﹤0.01% |
+33,359
| New | +$2.55M |
|
1646
CALL
Conagra Brands
CAG
$6.87B
| $2.94M | ﹤0.01% |
218,300
-56,200
| -20% | -$785K |
|
1647
CALL
Allegro MicroSystems
ALGM
$6.85B
| $2.94M | ﹤0.01% |
42,200
+34,200
| +428% | +$1.6M |
|
1648
D-Wave Quantum Inc
QBTS
$6.61B
| $2.93M | ﹤0.01% |
122,302
+122,000
| +40,397% | +$2.68M |
|
|
Q
1649
CALL
Qnity Electronics Inc
Q
$26.1B
| $2.92M | ﹤0.01% |
17,900
-1,000
| -5% | -$147K |
|
1650
CALL
Rockwell Automation
ROK
$48.2B
| $2.92M | ﹤0.01% |
5,900
-12,500
| -68% | -$5.44M |
|
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.