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 | |
|---|---|---|---|---|---|---|
|
USAS
4751
PUT
Americas Gold and Silver
USAS
$1.52B
| $194K | ﹤0.01% |
41,200
+21,300
| +107% | +$123K |
|
4752
PUT
Gartner
IT
$11.7B
| $194K | ﹤0.01% |
1,500
-1,700
| -53% | -$256K |
|
4753
PUT
Bitwise Bitcoin ETF
BITB
$3.09B
| $194K | ﹤0.01% |
6,100
+100
| +2% | +$3.9K |
|
4754
CALL
Vista Gold
VGZ
$391M
| $194K | ﹤0.01% |
101,500
-67,500
| -40% | -$147K |
|
4755
PUT
WillScot Mobile Mini Holdings
WSC
$3.16B
| $193K | ﹤0.01% |
6,700
+900
| +16% | +$21.8K |
|
4756
PUT
Americold
COLD
$4.15B
| $193K | ﹤0.01% |
12,300
-62,400
| -84% | -$856K |
|
|
SMCY
4757
YieldMax SMCI Option Income Strategy ETF
SMCY
$140M
| $193K | ﹤0.01% |
38,195
+2,058
| +6% | +$12.6K |
|
|
BCAX
4758
PUT
Bicara Therapeutics
BCAX
$1.23B
| $193K | ﹤0.01% |
6,500
-2,800
| -30% | -$62.5K |
|
4759
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.33B
| $193K | ﹤0.01% |
3,700
+1,300
| +54% | +$73.6K |
|
4760
CALL
United Bankshares
UBSI
$6.28B
| $192K | ﹤0.01% |
4,200
-13,000
| -76% | -$569K |
|
|
AIRJ
4761
CALL
Montana Technologies Corp
AIRJ
$290M
| $192K | ﹤0.01% |
+34,700
| New | +$134K |
|
4762
CALL
Matsons
MATX
$6.77B
| $192K | ﹤0.01% |
+1,000
| New | +$182K |
|
|
BCYC
4763
CALL
Bicycle Therapeutics
BCYC
$255M
| $192K | ﹤0.01% |
45,300
+15,700
| +53% | +$72K |
|
4764
CALL
Arrow Electronics
ARW
$11.7B
| $192K | ﹤0.01% |
900
+800
| +800% | +$160K |
|
4765
CALL
Hess Midstream
HESM
$4.83B
| $192K | ﹤0.01% |
5,100
-3,600
| -41% | -$138K |
|
4766
CALL
InflaRx
IFRX
$273M
| $192K | ﹤0.01% |
85,500
+35,900
| +72% | +$67.5K |
|
4767
CALL
Repay Holdings
RPAY
$308M
| $192K | ﹤0.01% |
+45,600
| New | +$158K |
|
4768
Ralph Lauren
RL
$21.2B
| $191K | ﹤0.01% |
+477
| New | +$178K |
|
4769
PUT
ADS-TEC Energy
ADSE
$827M
| $191K | ﹤0.01% |
15,000
+14,900
| +14,900% | +$172K |
|
4770
Supernus Pharmaceuticals
SUPN
$2.56B
| $191K | ﹤0.01% |
4,112
+1,262
| +44% | +$60.6K |
|
4771
PUT
RadNet
RDNT
$5.56B
| $191K | ﹤0.01% |
3,100
+3,000
| +3,000% | +$169K |
|
4772
Golub Capital BDC
GBDC
$3.28B
| $191K | ﹤0.01% |
+14,823
| New | +$193K |
|
4773
Eastman Chemical
EMN
$7.52B
| $191K | ﹤0.01% |
+2,846
| New | +$208K |
|
4774
CALL
National Grid
NGG
$75.3B
| $191K | ﹤0.01% |
2,300
-10,000
| -81% | -$850K |
|
|
WLTH
4775
CALL
Wealthfront Corp
WLTH
$1.58B
| $190K | ﹤0.01% |
21,300
-20,900
| -50% | -$218K |
|
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.