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 | |
|---|---|---|---|---|---|---|
7401
PUT
Bright Horizons
BFAM
$3.42B
| $14.2K | ﹤0.01% |
200
+100
| +100% | +$7.23K |
|
7402
PUT
Commault Systems
CVLT
$5.65B
| $14.2K | ﹤0.01% |
+100
| New | +$10.7K |
|
7403
PUT
Freshworks
FRSH
$3.32B
| $14.2K | ﹤0.01% |
1,400
-1,600
| -53% | -$14.2K |
|
|
FSP
7404
PUT
Franklin Street Properties
FSP
$42.1M
| $14.2K | ﹤0.01% |
27,500
| – | – |
|
7405
Carter's
CRI
$1.23B
| $14.2K | ﹤0.01% |
344
+324
| +1,620% | +$12.3K |
|
7406
Liberty Live Group Series C
LLYVK
$9.11B
| $14.2K | ﹤0.01% |
+134
| New | +$13.1K |
|
7407
CALL
Fidelity National Financial
FNF
$12.3B
| $14.1K | ﹤0.01% |
300
-900
| -75% | -$43.6K |
|
7408
CALL
Lantronix
LTRX
$244M
| $14.1K | ﹤0.01% |
2,400
-14,600
| -86% | -$93.6K |
|
7409
PUT
Caribou Biosciences
CRBU
$168M
| $14.1K | ﹤0.01% |
8,000
+3,900
| +95% | +$7.71K |
|
7410
CALL
Marcus Corp
MCS
$841M
| $14.1K | ﹤0.01% |
+600
| New | +$11.8K |
|
7411
PUT
WhiteHorse Finance
WHF
$152M
| $14.1K | ﹤0.01% |
2,100
-500
| -19% | -$3.56K |
|
|
RMAX
7412
DELISTED
RE/MAX Holdings
RMAX
| $14.1K | ﹤0.01% |
1,426
+1,329
| +1,370% | +$11.6K |
|
7413
Geospace Technologies
GEOS
$69.6M
| $14K | ﹤0.01% |
2,075
+1,679
| +424% | +$14.5K |
|
7414
CALL
Costamare
CMRE
$1.88B
| $14K | ﹤0.01% |
1,000
-6,800
| -87% | -$112K |
|
7415
WisdomTree US Quality Growth Fund
QGRW
$3B
| $14K | ﹤0.01% |
+212
| New | +$13.4K |
|
|
XRP
7416
CALL
Bitwise XRP ETF
XRP
$317M
| $14K | ﹤0.01% |
+1,200
| New | +$17.5K |
|
|
QPUX
7417
Defiance 2X Daily Long Pure Quantum ETF
QPUX
$32M
| $14K | ﹤0.01% |
500
-73
| -13% | -$2.22K |
|
7418
National Beverage
FIZZ
$3.02B
| $13.9K | ﹤0.01% |
447
+342
| +326% | +$11.9K |
|
7419
Tompkins Financial
TMP
$1.43B
| $13.9K | ﹤0.01% |
147
+1
| +0.7% | +$86 |
|
7420
CALL
Evertec
EVTC
$1.81B
| $13.9K | ﹤0.01% |
500
-14,000
| -97% | -$372K |
|
7421
Korea Electric Power
KEP
$15.3B
| $13.9K | ﹤0.01% |
1,145
-2,151
| -65% | -$29.7K |
|
7422
CALL
First Financial Bankshares
FFIN
$4.79B
| $13.8K | ﹤0.01% |
400
| – | – |
|
7423
PUT
Ezcorp Inc
EZPW
$2.05B
| $13.8K | ﹤0.01% |
400
+100
| +33% | +$3.16K |
|
7424
BWX Technologies
BWXT
$14.4B
| $13.8K | ﹤0.01% |
+71
| New | +$14.8K |
|
7425
PUT
Ameresco
AMRC
$1.23B
| $13.8K | ﹤0.01% |
+500
| New | +$14.5K |
|
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.