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 | |
|---|---|---|---|---|---|---|
3001
CALL
Dick's Sporting Goods
DKS
$13.1B
| $817K | ﹤0.01% |
3,600
-3,500
| -49% | -$773K |
|
3002
CALL
Omeros
OMER
$1.43B
| $816K | ﹤0.01% |
85,800
+400
| +0.5% | +$4.76K |
|
|
BLD
3003
PUT
DELISTED
TopBuild
BLD
| $815K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$907K |
|
3004
CALL
Dominari Holdings
DOMH
$59.2M
| $815K | ﹤0.01% |
+259,600
| New | +$817K |
|
3005
Harmony Gold Mining
HMY
$11.1B
| $815K | ﹤0.01% |
53,592
-5,671
| -10% | -$94.2K |
|
3006
Bloom Energy
BE
$76.8B
| $815K | ﹤0.01% |
+2,692
| New | +$690K |
|
3007
CALL
Main Street Capital
MAIN
$5.11B
| $815K | ﹤0.01% |
15,700
+6,700
| +74% | +$353K |
|
3008
CALL
iShares Convertible Bond ETF
ICVT
$8.01B
| $814K | ﹤0.01% |
19,300
+6,900
| +56% | +$800K |
|
3009
PUT
Tidewater
TDW
$4.24B
| $813K | ﹤0.01% |
12,200
-1,900
| -13% | -$151K |
|
3010
CALL
Boyd Gaming
BYD
$5.09B
| $813K | ﹤0.01% |
9,200
+5,700
| +163% | +$485K |
|
3011
PUT
Fastenal
FAST
$57.8B
| $812K | ﹤0.01% |
16,900
+12,500
| +284% | +$567K |
|
3012
PUT
Capri Holdings
CPRI
$1.68B
| $812K | ﹤0.01% |
43,700
-7,400
| -14% | -$142K |
|
3013
PUT
Portillo's
PTLO
$241M
| $811K | ﹤0.01% |
171,000
-66,900
| -28% | -$324K |
|
3014
PUT
Copa Holdings
CPA
$5.34B
| $809K | ﹤0.01% |
5,200
+3,400
| +189% | +$443K |
|
3015
PUT
Ichor Holdings
ICHR
$2.15B
| $808K | ﹤0.01% |
7,200
+5,200
| +260% | +$375K |
|
3016
Rollins
ROL
$14.4B
| $808K | ﹤0.01% |
+19,356
| New | +$989K |
|
3017
FormFactor
FORM
$9.87B
| $808K | ﹤0.01% |
5,050
+3,233
| +178% | +$429K |
|
3018
CALL
Brinker International
EAT
$8.43B
| $806K | ﹤0.01% |
4,800
-3,300
| -41% | -$488K |
|
3019
CALL
ProPetro Holding
PUMP
$1.17B
| $806K | ﹤0.01% |
56,200
-12,700
| -18% | -$197K |
|
3020
CALL
UL Solutions
ULS
$13.3B
| $805K | ﹤0.01% |
7,900
+7,300
| +1,217% | +$690K |
|
|
CMBT
3021
PUT
CMB.TECH NV
CMBT
$5.6B
| $804K | ﹤0.01% |
57,500
-75,500
| -57% | -$1.09M |
|
|
FETH
3022
PUT
Fidelity Ethereum Fund
FETH
$1.44B
| $804K | ﹤0.01% |
51,100
-12,300
| -19% | -$252K |
|
3023
CALL
Rentokil
RTO
$10.2B
| $804K | ﹤0.01% |
28,100
+4,500
| +19% | +$143K |
|
3024
PUT
NexGen Energy
NXE
$6.01B
| $803K | ﹤0.01% |
85,500
-20,800
| -20% | -$236K |
|
3025
Mondelez International
MDLZ
$76.8B
| $802K | ﹤0.01% |
13,860
-2,346
| -14% | -$141K |
|
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.