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 | |
|---|---|---|---|---|---|---|
2626
Invesco Solar ETF
TAN
$924M
| $1.16M | ﹤0.01% |
19,551
-15,509
| -44% | -$942K |
|
2627
Belden
BDC
$4.39B
| $1.16M | ﹤0.01% |
9,640
+9,453
| +5,055% | +$1.1M |
|
2628
CALL
Ardagh Metal Packaging
AMBP
$2.62B
| $1.15M | ﹤0.01% |
243,600
-3,200
| -1% | -$13.1K |
|
2629
Ferrari
RACE
$72.2B
| $1.15M | ﹤0.01% |
3,093
-617
| -17% | -$215K |
|
2630
PUT
Factset
FDS
$9.71B
| $1.15M | ﹤0.01% |
5,000
-6,300
| -56% | -$1.45M |
|
2631
CALL
Fidelity National Information Services
FIS
$18.3B
| $1.15M | ﹤0.01% |
29,500
-600
| -2% | -$26K |
|
2632
CALL
Equinix
EQIX
$99.5B
| $1.15M | ﹤0.01% |
1,100
+500
| +83% | +$535K |
|
|
PPTA
2633
PUT
Perpetua Resources
PPTA
$2.94B
| $1.15M | ﹤0.01% |
55,200
+8,500
| +18% | +$231K |
|
2634
CALL
Genworth Financial
GNW
$3.56B
| $1.14M | ﹤0.01% |
120,800
+59,900
| +98% | +$532K |
|
2635
J.M. Smucker
SJM
$12.9B
| $1.14M | ﹤0.01% |
10,161
+4,388
| +76% | +$447K |
|
2636
CALL
Atomera
ATOM
$170M
| $1.14M | ﹤0.01% |
131,200
+65,300
| +99% | +$512K |
|
2637
CALL
American Battery Technology Co
ABAT
$322M
| $1.14M | ﹤0.01% |
403,600
+137,600
| +52% | +$440K |
|
2638
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$1.73B
| $1.14M | ﹤0.01% |
+35,249
| New | +$4.2M |
|
|
EMBJ
2639
CALL
Embraer S.A. ADS
EMBJ
$14B
| $1.14M | ﹤0.01% |
17,900
+2,700
| +18% | +$166K |
|
2640
CALL
Lincoln Electric
LECO
$14.8B
| $1.14M | ﹤0.01% |
4,300
+1,800
| +72% | +$471K |
|
2641
PUT
Arhaus
ARHS
$1.38B
| $1.14M | ﹤0.01% |
135,500
+104,700
| +340% | +$727K |
|
2642
CALL
Tyler Technologies
TYL
$13.3B
| $1.14M | ﹤0.01% |
3,900
+200
| +5% | +$63.2K |
|
|
NTSK
2643
PUT
Netskope Inc
NTSK
$7.22B
| $1.14M | ﹤0.01% |
104,100
+102,000
| +4,857% | +$1.04M |
|
2644
CALL
Spire Global
SPIR
$473M
| $1.14M | ﹤0.01% |
61,200
+53,300
| +675% | +$991K |
|
2645
CALL
Alignment Healthcare
ALHC
$1.7B
| $1.14M | ﹤0.01% |
47,800
+12,200
| +34% | +$234K |
|
2646
PUT
IAMGOLD
IAG
$11.2B
| $1.14M | ﹤0.01% |
71,700
+26,200
| +58% | +$458K |
|
2647
CoreCivic
CXW
$3.18B
| $1.13M | ﹤0.01% |
37,343
+18,485
| +98% | +$419K |
|
2648
CALL
TransAlta
TAC
$3.65B
| $1.13M | ﹤0.01% |
81,900
-6,500
| -7% | -$85.8K |
|
2649
Planet Fitness
PLNT
$3.22B
| $1.13M | ﹤0.01% |
21,709
+21,340
| +5,783% | +$1.25M |
|
2650
Levi Strauss
LEVI
$7.59B
| $1.13M | ﹤0.01% |
45,600
+33,916
| +290% | +$764K |
|
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.