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 | |
|---|---|---|---|---|---|---|
3151
CALL
Omnicom Group
OMC
$20.6B
| $728K | ﹤0.01% |
10,000
-59,800
| -86% | -$4.5M |
|
3152
PUT
Vista Energy
VIST
$7.44B
| $727K | ﹤0.01% |
11,400
-7,600
| -40% | -$535K |
|
3153
CALL
GigaCloud Technology
GCT
$1.9B
| $727K | ﹤0.01% |
23,000
-9,800
| -30% | -$386K |
|
3154
CALL
Biomea Fusion
BMEA
$92.8M
| $725K | ﹤0.01% |
493,500
+157,800
| +47% | +$236K |
|
3155
CALL
Emergent Biosolutions
EBS
$353M
| $725K | ﹤0.01% |
86,500
+2,900
| +3% | +$24.3K |
|
3156
CALL
Prime Medicine
PRME
$526M
| $725K | ﹤0.01% |
196,400
-107,600
| -35% | -$357K |
|
3157
CALL
Adtran
ADTN
$557M
| $724K | ﹤0.01% |
52,100
+51,600
| +10,320% | +$805K |
|
3158
Starbucks
SBUX
$109B
| $724K | ﹤0.01% |
7,084
-8,409
| -54% | -$847K |
|
3159
PUT
Woodward
WWD
$19.3B
| $723K | ﹤0.01% |
1,700
-900
| -35% | -$341K |
|
|
FPS
3160
Forgent Power Solutions
FPS
$10.1B
| $722K | ﹤0.01% |
+12,933
| New | +$590K |
|
3161
PDF Solutions
PDFS
$2.1B
| $722K | ﹤0.01% |
+10,205
| New | +$506K |
|
3162
CALL
Magna International
MGA
$17.3B
| $722K | ﹤0.01% |
11,000
-6,200
| -36% | -$387K |
|
3163
PUT
Tonix Pharmaceuticals
TNXP
$170M
| $722K | ﹤0.01% |
56,600
+39,300
| +227% | +$507K |
|
|
LB
3164
PUT
LandBridge Co
LB
$2.42B
| $721K | ﹤0.01% |
9,100
+8,100
| +810% | +$556K |
|
3165
CALL
Finance of America Companies
FOA
$126M
| $721K | ﹤0.01% |
26,200
+5,200
| +25% | +$106K |
|
3166
PUT
Intellia Therapeutics
NTLA
$1.62B
| $721K | ﹤0.01% |
42,600
-84,500
| -66% | -$1.18M |
|
3167
CALL
PACCAR
PCAR
$58.8B
| $721K | ﹤0.01% |
6,000
+1,100
| +22% | +$130K |
|
3168
CALL
Levi Strauss
LEVI
$7.64B
| $720K | ﹤0.01% |
29,000
+5,200
| +22% | +$117K |
|
|
BABO
3169
CALL
YieldMax BABA Option Income Strategy ETF
BABO
$13.5M
| $719K | ﹤0.01% |
25,600
+6,700
| +35% | +$64.9K |
|
3170
CALL
Amdocs
DOX
$5.98B
| $718K | ﹤0.01% |
14,200
-44,000
| -76% | -$2.7M |
|
3171
PUT
HF Sinclair
DINO
$19B
| $717K | ﹤0.01% |
10,300
-94,200
| -90% | -$6.26M |
|
3172
F5
FFIV
$24.9B
| $715K | ﹤0.01% |
+1,720
| New | +$611K |
|
3173
W.P. Carey
WPC
$15B
| $715K | ﹤0.01% |
10,003
-4,796
| -32% | -$351K |
|
|
SUPV
3174
Grupo Supervielle
SUPV
$612M
| $715K | ﹤0.01% |
74,025
-36,173
| -33% | -$335K |
|
3175
PUT
Western Midstream Partners
WES
$18.8B
| $713K | ﹤0.01% |
16,300
-2,800
| -15% | -$121K |
|
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.