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 | |
|---|---|---|---|---|---|---|
51
PUT
iShares Bitcoin Trust
IBIT
$65.8B
| $383M | 0.22% |
11,494,600
+1,564,300
| +16% | +$63.6M |
|
52
CALL
Oracle
ORCL
$415B
| $354M | 0.21% |
2,416,200
+23,600
| +1% | +$4.28M |
|
|
NBIS
53
PUT
Nebius Group N.V.
NBIS
$64.5B
| $340M | 0.2% |
1,229,800
+544,900
| +80% | +$108M |
|
|
SPCX
54
PUT
SpaceX
SPCX
$1.96T
| $323M | 0.19% |
+1,890,100
| New | +$321M |
|
55
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.09B
| $315M | 0.18% |
3,232,400
+71,000
| +2% | +$23.7M |
|
56
PUT
iShares Silver Trust
SLV
$31.3B
| $309M | 0.18% |
5,787,600
-4,748,600
| -45% | -$315M |
|
57
NVIDIA
NVDA
$5.43T
| $304M | 0.18% |
1,520,692
+11,539
| +0.8% | +$2.37M |
|
58
CALL
iShares MSCI Australia ETF
EWA
$1.26B
| $302M | 0.18% |
5,313,300
-1,281,100
| -19% | -$37.2M |
|
59
PUT
Arm
ARM
$331B
| $292M | 0.17% |
822,600
+43,200
| +6% | +$11.5M |
|
60
PUT
Strategy Inc
MSTR
$63B
| $282M | 0.17% |
3,243,700
-909,000
| -22% | -$132M |
|
|
61
CALL
TSMC
TSM
$2.34T
| $280M | 0.16% |
587,300
-167,700
| -22% | -$68.1M |
|
|
62
PUT
iShares MSCI Australia ETF
EWA
$1.26B
| $278M | 0.16% |
2,630,600
-1,111,200
| -30% | -$32.2M |
|
63
CALL
CrowdStrike
CRWD
$258B
| $255M | 0.15% |
1,336,000
-234,800
| -15% | -$33.4M |
|
64
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.2B
| $246M | 0.14% |
470,400
+130,900
| +39% | +$65.4M |
|
65
CALL
Goldman Sachs
GS
$272B
| $244M | 0.14% |
240,900
-30,100
| -11% | -$29.3M |
|
66
CALL
Marvell Technology
MRVL
$235B
| $236M | 0.14% |
791,000
-10,300
| -1% | -$2.07M |
|
67
PUT
Cisco
CSCO
$421B
| $235M | 0.14% |
1,997,400
+758,400
| +61% | +$79.3M |
|
68
PUT
United States Oil Fund
USO
$1.96B
| $234M | 0.14% |
2,199,200
-1,080,000
| -33% | -$142M |
|
69
PUT
Applied Materials
AMAT
$385B
| $226M | 0.13% |
313,200
+71,000
| +29% | +$32.8M |
|
|
70
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.09B
| $226M | 0.13% |
1,789,500
-76,000
| -4% | -$25.4M |
|
|
71
PUT
Goldman Sachs
GS
$272B
| $224M | 0.13% |
221,300
-16,300
| -7% | -$15.9M |
|
72
CALL
Robinhood
HOOD
$107B
| $214M | 0.13% |
2,134,200
+478,600
| +29% | +$40.1M |
|
73
CALL
Alibaba
BABA
$273B
| $212M | 0.12% |
2,212,700
-206,000
| -9% | -$25.8M |
|
74
PUT
JPMorgan Chase
JPM
$912B
| $211M | 0.12% |
644,800
-107,400
| -14% | -$33.4M |
|
75
PUT
ASML
ASML
$670B
| $211M | 0.12% |
105,900
-74,300
| -41% | -$118M |
|
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.