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 | |
|---|---|---|---|---|---|---|
|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$796B
| $24.9B | 14.63% |
33,407,300
-8,740,600
| -21% | -$6.34B |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$796B
| $17B | 9.95% |
22,725,000
+1,074,900
| +5% | +$779M |
|
3
PUT
Invesco QQQ Trust
QQQ
$502B
| $10.1B | 5.94% |
13,765,500
+2,513,100
| +22% | +$1.73B |
|
|
4
CALL
Invesco QQQ Trust
QQQ
$502B
| $8.03B | 4.71% |
10,904,800
+526,600
| +5% | +$362M |
|
5
PUT
iShares S&P 100 ETF
OEF
$20.6B
| $7.76B | 4.55% |
39,367,200
+5,148,700
| +15% | +$1.84B |
|
|
6
PUT
Micron Technology
MU
$1.22T
| $3.63B | 2.13% |
3,140,900
+1,023,900
| +48% | +$768M |
|
7
CALL
NVIDIA
NVDA
$5.43T
| $3.51B | 2.06% |
17,519,600
-1,561,100
| -8% | -$321M |
|
|
8
CALL
iShares S&P 100 ETF
OEF
$20.6B
| $3.34B | 1.96% |
26,912,500
-6,536,500
| -20% | -$2.34B |
|
|
9
PUT
NVIDIA
NVDA
$5.43T
| $3.28B | 1.92% |
16,385,300
-2,824,200
| -15% | -$581M |
|
|
10
CALL
Tesla
TSLA
$1.47T
| $2.94B | 1.73% |
7,001,500
-2,194,900
| -24% | -$873M |
|
|
11
PUT
Tesla
TSLA
$1.47T
| $2.44B | 1.43% |
5,799,800
-2,512,600
| -30% | -$999M |
|
12
CALL
Alphabet (Google) Class A
GOOGL
$4.21T
| $2.37B | 1.39% |
6,656,100
-541,100
| -8% | -$195M |
|
|
13
CALL
Apple
AAPL
$4.98T
| $2.36B | 1.39% |
8,168,800
-591,300
| -7% | -$169M |
|
|
14
CALL
Micron Technology
MU
$1.22T
| $2.2B | 1.29% |
1,906,800
-121,000
| -6% | -$90.7M |
|
|
15
CALL
Meta Platforms (Facebook)
META
$1.91T
| $2.04B | 1.2% |
3,620,200
-489,500
| -12% | -$299M |
|
|
SNDK
16
PUT
Sandisk
SNDK
$260B
| $1.97B | 1.15% |
864,500
+578,300
| +202% | +$826M |
|
|
17
PUT
Advanced Micro Devices
AMD
$1.03T
| $1.96B | 1.15% |
3,374,900
-106,000
| -3% | -$43.5M |
|
|
18
PUT
Alphabet (Google) Class A
GOOGL
$4.21T
| $1.93B | 1.13% |
5,428,100
+375,000
| +7% | +$135M |
|
19
CALL
Microsoft
MSFT
$3.83T
| $1.74B | 1.02% |
4,655,800
+477,400
| +11% | +$193M |
|
|
20
PUT
Apple
AAPL
$4.98T
| $1.72B | 1.01% |
5,954,700
-68,200
| -1% | -$19.5M |
|
|
21
CALL
Advanced Micro Devices
AMD
$1.03T
| $1.71B | 1.01% |
2,951,000
+3,400
| +0.1% | +$1.39M |
|
22
PUT
VanEck Gold Miners ETF
GDX
$27.6B
| $1.62B | 0.95% |
3,966,700
+690,600
| +21% | +$61M |
|
23
CALL
SPDR Gold Trust
GLD
$145B
| $1.45B | 0.85% |
3,937,600
-1,552,900
| -28% | -$643M |
|
|
24
CALL
Amazon
AMZN
$2.69T
| $1.24B | 0.73% |
5,219,400
-1,781,100
| -25% | -$447M |
|
|
25
PUT
Meta Platforms (Facebook)
META
$1.91T
| $1.17B | 0.69% |
2,084,500
-417,000
| -17% | -$255M |
|
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.