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 | |
|---|---|---|---|---|---|---|
26
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.16B
| $963M | 0.56% |
12,991,800
-2,383,900
| -16% | -$122M |
|
27
PUT
Microsoft
MSFT
$3.83T
| $905M | 0.53% |
2,425,900
+59,700
| +3% | +$24.2M |
|
|
28
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.16B
| $883M | 0.52% |
12,448,000
-532,200
| -4% | -$27.3M |
|
|
29
PUT
Amazon
AMZN
$2.69T
| $831M | 0.49% |
3,486,200
-902,500
| -21% | -$227M |
|
30
CALL
VanEck Gold Miners ETF
GDX
$27.6B
| $805M | 0.47% |
3,268,100
+557,400
| +21% | +$49.2M |
|
31
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.2B
| $785M | 0.46% |
1,503,000
+35,000
| +2% | +$17.5M |
|
32
PUT
Broadcom
AVGO
$1.68T
| $754M | 0.44% |
1,997,300
-99,800
| -5% | -$40M |
|
33
PUT
Intel
INTC
$650B
| $745M | 0.44% |
5,334,900
+1,200,600
| +29% | +$121M |
|
34
PUT
SPDR Gold Trust
GLD
$145B
| $740M | 0.43% |
2,008,600
-1,822,300
| -48% | -$755M |
|
|
35
CALL
Intel
INTC
$650B
| $724M | 0.42% |
5,185,300
-1,712,700
| -25% | -$173M |
|
|
36
CALL
Broadcom
AVGO
$1.68T
| $695M | 0.41% |
1,841,100
+161,600
| +10% | +$64.8M |
|
|
37
PUT
TSMC
TSM
$2.34T
| $630M | 0.37% |
1,320,000
-155,000
| -11% | -$62.9M |
|
|
SNDK
38
CALL
Sandisk
SNDK
$260B
| $588M | 0.34% |
258,700
-3,800
| -1% | -$5.42M |
|
39
CALL
iShares Silver Trust
SLV
$31.3B
| $584M | 0.34% |
10,916,100
-9,074,000
| -45% | -$602M |
|
40
PUT
Palantir
PLTR
$456B
| $547M | 0.32% |
4,692,000
-159,200
| -3% | -$21.7M |
|
41
CALL
Netflix
NFLX
$296B
| $530M | 0.31% |
7,425,500
+12,100
| +0.2% | +$1.07M |
|
42
CALL
UnitedHealth
UNH
$338B
| $508M | 0.3% |
1,223,100
-695,900
| -36% | -$258M |
|
|
43
PUT
Netflix
NFLX
$296B
| $474M | 0.28% |
6,642,600
-926,200
| -12% | -$81.6M |
|
|
44
CALL
Palantir
PLTR
$456B
| $423M | 0.25% |
3,628,900
-356,600
| -9% | -$48.6M |
|
45
CALL
iShares Bitcoin Trust
IBIT
$65.8B
| $415M | 0.24% |
12,461,100
-698,600
| -5% | -$28.4M |
|
|
46
PUT
UnitedHealth
UNH
$338B
| $406M | 0.24% |
976,200
-184,400
| -16% | -$68.3M |
|
|
SPCX
47
CALL
SpaceX
SPCX
$1.96T
| $401M | 0.24% |
+2,348,600
| New | +$399M |
|
48
PUT
Marvell Technology
MRVL
$235B
| $395M | 0.23% |
1,326,300
+332,200
| +33% | +$66.6M |
|
49
PUT
Oracle
ORCL
$415B
| $384M | 0.23% |
2,619,100
+14,200
| +0.5% | +$2.57M |
|
50
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$6.68B
| $383M | 0.22% |
1,621,800
-915,800
| -36% | -$165M |
|
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.