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 | |
|---|---|---|---|---|---|---|
3176
PUT
Ryder
R
$8.95B
| $712K | ﹤0.01% |
2,700
-1,500
| -36% | -$367K |
|
3177
Ichor Holdings
ICHR
$2.22B
| $712K | ﹤0.01% |
+6,339
| New | +$457K |
|
3178
CALL
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$411M
| $712K | ﹤0.01% |
4,400
+4,000
| +1,000% | +$66.2K |
|
3179
CALL
Northern Oil and Gas
NOG
$2.47B
| $711K | ﹤0.01% |
39,200
+9,100
| +30% | +$216K |
|
3180
CALL
Vornado Realty Trust
VNO
$6.32B
| $711K | ﹤0.01% |
18,100
+3,900
| +27% | +$126K |
|
3181
Lightwave Logic
LWLG
$775M
| $711K | ﹤0.01% |
75,117
+73,054
| +3,541% | +$856K |
|
3182
NNN REIT
NNN
$7.92B
| $711K | ﹤0.01% |
15,270
+4,349
| +40% | +$194K |
|
3183
CALL
Remitly
RELY
$4.63B
| $710K | ﹤0.01% |
31,700
-16,000
| -34% | -$328K |
|
3184
PUT
HDFC Bank
HDB
$115B
| $710K | ﹤0.01% |
27,500
+19,500
| +244% | +$489K |
|
3185
CALL
Planet Fitness
PLNT
$3.04B
| $710K | ﹤0.01% |
13,600
+10,200
| +300% | +$599K |
|
3186
PUT
J.M. Smucker
SJM
$12.9B
| $709K | ﹤0.01% |
6,300
-3,200
| -34% | -$326K |
|
3187
CALL
Scholastic
SCHL
$612M
| $708K | ﹤0.01% |
15,400
-6,700
| -30% | -$275K |
|
3188
PUT
Aptiv
APTV
$9.07B
| $708K | ﹤0.01% |
13,200
+10,800
| +450% | +$661K |
|
3189
CALL
Qfin Holdings
QFIN
$867M
| $708K | ﹤0.01% |
44,800
+27,400
| +157% | +$385K |
|
3190
CALL
Alexandria Real Estate Equities
ARE
$8.28B
| $708K | ﹤0.01% |
13,400
-14,700
| -52% | -$703K |
|
3191
Rithm Capital
RITM
$5.09B
| $707K | ﹤0.01% |
75,313
+491
| +0.7% | +$4.68K |
|
3192
Centuri Holdings
CTRI
$2.03B
| $707K | ﹤0.01% |
23,380
-32,070
| -58% | -$1.04M |
|
3193
CALL
KULR Technology Group
KULR
$114M
| $706K | ﹤0.01% |
185,400
+2,000
| +1% | +$6.66K |
|
3194
Extreme Networks
EXTR
$2.79B
| $706K | ﹤0.01% |
+21,802
| New | +$526K |
|
3195
PUT
Shoals Technologies Group
SHLS
$1.25B
| $705K | ﹤0.01% |
71,200
+39,700
| +126% | +$360K |
|
|
VSNT
3196
Versant Media Group
VSNT
$4.53B
| $704K | ﹤0.01% |
19,551
+4,718
| +32% | +$189K |
|
3197
PUT
Praxis Precision Medicines
PRAX
$8.11B
| $703K | ﹤0.01% |
2,100
-10,200
| -83% | -$3.23M |
|
3198
CALL
Henry Schein
HSIC
$9.52B
| $702K | ﹤0.01% |
8,400
+3,900
| +87% | +$298K |
|
3199
CALL
Varonis Systems
VRNS
$5.41B
| $701K | ﹤0.01% |
16,700
-4,700
| -22% | -$138K |
|
3200
PUT
Rhythm Pharmaceuticals
RYTM
$6.78B
| $699K | ﹤0.01% |
6,300
+6,100
| +3,050% | +$552K |
|
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.