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 | |
|---|---|---|---|---|---|---|
3076
Intellia Therapeutics
NTLA
$1.63B
| $771K | ﹤0.01% |
+45,550
| New | +$638K |
|
3077
CALL
Eastman Chemical
EMN
$7.59B
| $770K | ﹤0.01% |
11,500
-10,400
| -47% | -$761K |
|
3078
Gildan
GIL
$7.92B
| $770K | ﹤0.01% |
14,924
+9,074
| +155% | +$521K |
|
3079
CALL
Cemex
CX
$13.7B
| $768K | ﹤0.01% |
64,000
-2,600
| -4% | -$32.3K |
|
3080
PUT
RXO
RXO
$3.28B
| $767K | ﹤0.01% |
27,800
-42,100
| -60% | -$930K |
|
3081
CALL
Portillo's
PTLO
$244M
| $767K | ﹤0.01% |
161,800
+46,800
| +41% | +$227K |
|
|
BAND
3082
CALL
Bandwidth Inc
BAND
$2B
| $766K | ﹤0.01% |
12,100
+11,700
| +2,925% | +$525K |
|
3083
PUT
State Street Multi-Asset Real Return ETF
RLY
$1.39B
| $766K | ﹤0.01% |
19,100
-27,700
| -59% | -$1.01M |
|
3084
Porch Group
PRCH
$1.94B
| $766K | ﹤0.01% |
50,904
+44,743
| +726% | +$441K |
|
3085
CALL
Marten Transport
MRTN
$1.05B
| $765K | ﹤0.01% |
44,100
+3,900
| +10% | +$62K |
|
3086
PUT
Bowman Consulting
BWMN
$738M
| $765K | ﹤0.01% |
26,200
+7,700
| +42% | +$243K |
|
3087
CALL
Dana Inc
DAN
$2.85B
| $765K | ﹤0.01% |
28,100
-400
| -1% | -$13.7K |
|
3088
CALL
Quantum Corp
QMCO
$1.24B
| $765K | ﹤0.01% |
+69,500
| New | +$667K |
|
3089
PUT
TMC The Metals Company
TMC
$1.72B
| $764K | ﹤0.01% |
172,500
+57,400
| +50% | +$299K |
|
3090
CALL
Heritage Insurance Holdings
HRTG
$991M
| $764K | ﹤0.01% |
29,300
+18,800
| +179% | +$469K |
|
3091
PUT
Ovintiv
OVV
$16.6B
| $763K | ﹤0.01% |
14,500
-500
| -3% | -$28.6K |
|
3092
PUT
nVent Electric
NVT
$26.1B
| $763K | ﹤0.01% |
4,500
+3,200
| +246% | +$499K |
|
3093
PUT
Public Service Enterprise Group
PEG
$33.3B
| $763K | ﹤0.01% |
9,400
+8,300
| +755% | +$663K |
|
3094
KE Holdings
BEKE
$18.7B
| $763K | ﹤0.01% |
52,501
+39,020
| +289% | +$643K |
|
3095
PUT
Main Street Capital
MAIN
$5.14B
| $763K | ﹤0.01% |
14,700
-10,700
| -42% | -$564K |
|
3096
CALL
Flywire
FLYW
$2.12B
| $763K | ﹤0.01% |
43,400
+41,300
| +1,967% | +$610K |
|
3097
Quantum Computing Inc
QUBT
$1.97B
| $762K | ﹤0.01% |
78,534
-87,518
| -53% | -$851K |
|
3098
Absci
ABSI
$1.62B
| $762K | ﹤0.01% |
65,707
-161,337
| -71% | -$909K |
|
3099
PUT
Vanguard Total International Stock ETF
VXUS
$162B
| $761K | ﹤0.01% |
8,900
+200
| +2% | +$16.7K |
|
3100
CALL
Babcock & Wilcox
BW
$877M
| $760K | ﹤0.01% |
53,900
-57,000
| -51% | -$967K |
|
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.