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 | |
|---|---|---|---|---|---|---|
976
PUT
Fabrinet
FN
$15B
| $6.97M | ﹤0.01% |
12,400
+4,500
| +57% | +$2.9M |
|
977
PUT
Agnico Eagle Mines
AEM
$98.5B
| $6.97M | ﹤0.01% |
44,900
+3,200
| +8% | +$593K |
|
|
SW
978
CALL
Smurfit Westrock
SW
$24.3B
| $6.96M | ﹤0.01% |
150,500
+112,100
| +292% | +$4.63M |
|
979
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$96.8M
| $6.94M | ﹤0.01% |
185,100
-131,900
| -42% | -$12.4M |
|
980
PUT
SolarEdge
SEDG
$2.01B
| $6.94M | ﹤0.01% |
118,700
+40,900
| +53% | +$2.14M |
|
981
PUT
NXP Semiconductors
NXPI
$60B
| $6.91M | ﹤0.01% |
24,600
+700
| +3% | +$193K |
|
982
PUT
HSBC
HSBC
$345B
| $6.91M | ﹤0.01% |
72,700
-79,400
| -52% | -$7.25M |
|
983
PUT
Tema ETF Trust Tema Heart & Health ETF
HRTS
$54.1M
| $6.91M | ﹤0.01% |
+227,300
| New | +$7.74M |
|
|
UCTT
984
PUT
Ultra Clean Holdings
UCTT
$3.52B
| $6.9M | ﹤0.01% |
48,400
+48,100
| +16,033% | +$4.23M |
|
985
CALL
Unilever
UL
$135B
| $6.9M | ﹤0.01% |
127,800
+43,200
| +51% | +$2.5M |
|
986
CALL
uniQure
QURE
$2.65B
| $6.9M | ﹤0.01% |
149,800
-507,300
| -77% | -$13.3M |
|
987
PUT
Novanta
NOVT
$5.44B
| $6.9M | ﹤0.01% |
42,500
+41,400
| +3,764% | +$5.99M |
|
988
PUT
Zeta Global
ZETA
$7.39B
| $6.89M | ﹤0.01% |
350,000
+234,100
| +202% | +$4.34M |
|
989
PUT
Snap
SNAP
$9.17B
| $6.87M | ﹤0.01% |
1,547,900
-318,400
| -17% | -$1.74M |
|
990
PUT
American Tower
AMT
$78.8B
| $6.87M | ﹤0.01% |
42,000
-25,400
| -38% | -$4.57M |
|
991
PUT
XPeng
XPEV
$9.69B
| $6.86M | ﹤0.01% |
518,300
+140,900
| +37% | +$2.23M |
|
992
PUT
Marriott International
MAR
$91.8B
| $6.86M | ﹤0.01% |
18,500
+5,900
| +47% | +$2.18M |
|
993
CALL
dLocal
DLO
$4.14B
| $6.81M | ﹤0.01% |
524,200
+457,400
| +685% | +$5.8M |
|
994
PUT
Canadian Pacific Kansas City
CP
$76.4B
| $6.81M | ﹤0.01% |
78,600
-20,900
| -21% | -$1.79M |
|
995
PUT
Lennar Class A
LEN
$19.8B
| $6.8M | ﹤0.01% |
75,200
+27,600
| +58% | +$2.47M |
|
996
CALL
Diamondback Energy
FANG
$52.3B
| $6.79M | ﹤0.01% |
38,600
-19,700
| -34% | -$3.82M |
|
997
PUT
Rockwell Automation
ROK
$48.2B
| $6.78M | ﹤0.01% |
13,700
-11,000
| -45% | -$4.79M |
|
998
CALL
PENN Entertainment
PENN
$2.1B
| $6.78M | ﹤0.01% |
317,200
+154,700
| +95% | +$2.77M |
|
999
CALL
Interactive Brokers
IBKR
$40.4B
| $6.77M | ﹤0.01% |
77,800
-49,900
| -39% | -$4.15M |
|
1000
iShares Bitcoin Trust
IBIT
$65.8B
| $6.76M | ﹤0.01% |
203,178
+10,152
| +5% | +$413K |
|
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.