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 | |
|---|---|---|---|---|---|---|
1126
PUT
AGNC Investment
AGNC
$11.4B
| $5.63M | ﹤0.01% |
516,700
-181,200
| -26% | -$1.91M |
|
1127
ACM Research
ACMR
$5.38B
| $5.62M | ﹤0.01% |
44,316
+19,852
| +81% | +$1.4M |
|
|
TLN
1128
PUT
Talen Energy Corp
TLN
$14.6B
| $5.61M | ﹤0.01% |
14,600
+9,000
| +161% | +$3.3M |
|
1129
CALL
Chewy
CHWY
$7.34B
| $5.6M | ﹤0.01% |
284,900
-93,900
| -25% | -$2.13M |
|
1130
PUT
PNC Financial Services
PNC
$90B
| $5.59M | ﹤0.01% |
22,700
+5,100
| +29% | +$1.14M |
|
1131
CALL
Quantum Computing Inc
QUBT
$2.03B
| $5.59M | ﹤0.01% |
575,900
+269,000
| +88% | +$2.62M |
|
1132
CALL
FormFactor
FORM
$10.1B
| $5.58M | ﹤0.01% |
34,900
+19,000
| +119% | +$2.52M |
|
1133
CALL
ASE Group
ASX
$115B
| $5.57M | ﹤0.01% |
123,500
+83,800
| +211% | +$2.81M |
|
1134
CALL
Grayscale Bitcoin Trust
GBTC
$12.6B
| $5.56M | ﹤0.01% |
122,200
-4,500
| -4% | -$251K |
|
1135
CALL
Dollar General
DG
$27.5B
| $5.54M | ﹤0.01% |
48,100
-62,500
| -57% | -$7.1M |
|
1136
PUT
Prologis
PLD
$126B
| $5.53M | ﹤0.01% |
40,800
-19,300
| -32% | -$2.74M |
|
1137
CALL
BigBear.ai
BBAI
$1.34B
| $5.52M | ﹤0.01% |
1,503,900
+663,600
| +79% | +$2.65M |
|
1138
CALL
Roper Technologies
ROP
$35.5B
| $5.52M | ﹤0.01% |
16,300
-200
| -1% | -$68.2K |
|
1139
Mercado Libre
MELI
$88.9B
| $5.51M | ﹤0.01% |
3,247
+750
| +30% | +$1.28M |
|
|
INFQ
1140
PUT
Infleqtion Inc
INFQ
$3.27B
| $5.51M | ﹤0.01% |
413,600
+411,500
| +19,595% | +$5.66M |
|
1141
CALL
Macy's
M
$5.91B
| $5.5M | ﹤0.01% |
233,700
+88,000
| +60% | +$1.84M |
|
1142
PUT
Pan American Silver
PAAS
$19.9B
| $5.48M | ﹤0.01% |
122,400
-51,600
| -30% | -$2.76M |
|
1143
PUT
Estee Lauder
EL
$34.2B
| $5.48M | ﹤0.01% |
69,400
-50,800
| -42% | -$4.1M |
|
1144
PUT
Ares Management
ARES
$27.8B
| $5.48M | ﹤0.01% |
49,200
-40,100
| -45% | -$4.81M |
|
1145
PUT
BridgeBio Pharma
BBIO
$12.8B
| $5.47M | ﹤0.01% |
73,500
-500
| -0.7% | -$35K |
|
|
NBIS
1146
Nebius Group N.V.
NBIS
$64.5B
| $5.47M | ﹤0.01% |
19,803
+17,266
| +681% | +$3.42M |
|
1147
PUT
Shake Shack
SHAK
$2.24B
| $5.46M | ﹤0.01% |
97,400
+58,900
| +153% | +$4.44M |
|
1148
PUT
GitLab
GTLB
$7.8B
| $5.45M | ﹤0.01% |
178,400
+84,800
| +91% | +$2.15M |
|
1149
PUT
McCormick & Company Non-Voting
MKC
$12.9B
| $5.44M | ﹤0.01% |
107,900
+69,100
| +178% | +$3.39M |
|
1150
PUT
AutoZone
AZO
$46.5B
| $5.43M | ﹤0.01% |
1,700
+400
| +31% | +$1.33M |
|
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.