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 | |
|---|---|---|---|---|---|---|
2851
CALL
Roivant Sciences
ROIV
$25.9B
| $945K | ﹤0.01% |
26,700
-29,700
| -53% | -$878K |
|
2852
CALL
OR Royalties Inc
OR
$6.7B
| $943K | ﹤0.01% |
29,800
-3,100
| -9% | -$114K |
|
2853
PUT
Sable Offshore Corp
SOC
$744M
| $941K | ﹤0.01% |
305,500
-213,700
| -41% | -$2.72M |
|
|
TDAY
2854
PUT
USA Today Co
TDAY
$943M
| $941K | ﹤0.01% |
110,000
+85,200
| +344% | +$643K |
|
|
AMTM
2855
CALL
Amentum Holdings
AMTM
$4.69B
| $940K | ﹤0.01% |
45,500
-56,000
| -55% | -$1.35M |
|
2856
iShares MSCI South Africa ETF
EZA
$499M
| $939K | ﹤0.01% |
14,867
+3,623
| +32% | +$248K |
|
2857
CALL
Newell Brands
NWL
$2.31B
| $938K | ﹤0.01% |
152,800
-32,900
| -18% | -$139K |
|
2858
PUT
Otis Worldwide
OTIS
$25.1B
| $938K | ﹤0.01% |
13,100
+6,500
| +98% | +$486K |
|
2859
Novanta
NOVT
$5.44B
| $938K | ﹤0.01% |
+5,780
| New | +$836K |
|
2860
PUT
RELX
RELX
$58.3B
| $937K | ﹤0.01% |
29,600
+14,000
| +90% | +$474K |
|
|
GRNY
2861
FundStrat Granny Shots US Large Cap ETF
GRNY
$4.56B
| $937K | ﹤0.01% |
+33,897
| New | +$902K |
|
2862
CALL
Weatherford International
WFRD
$6.08B
| $937K | ﹤0.01% |
11,500
-76,100
| -87% | -$7.72M |
|
2863
CALL
Belden
BDC
$4.39B
| $935K | ﹤0.01% |
7,800
+7,600
| +3,800% | +$886K |
|
2864
CALL
Trevi Therapeutics
TRVI
$2.05B
| $934K | ﹤0.01% |
50,100
+31,700
| +172% | +$461K |
|
2865
CALL
Harrow
HROW
$1.24B
| $934K | ﹤0.01% |
22,000
-11,200
| -34% | -$417K |
|
|
ARI
2866
Apollo Commercial Real Estate
ARI
$802M
| $934K | ﹤0.01% |
87,461
-32,203
| -27% | -$351K |
|
2867
CALL
Stratasys
SSYS
$723M
| $934K | ﹤0.01% |
109,100
+95,800
| +720% | +$839K |
|
2868
CALL
Stride
LRN
$3.26B
| $931K | ﹤0.01% |
10,800
+8,500
| +370% | +$781K |
|
2869
CALL
Liberty Energy
LBRT
$3.09B
| $930K | ﹤0.01% |
35,500
+20,400
| +135% | +$610K |
|
|
EXE
2870
Expand Energy Corp
EXE
$20.1B
| $927K | ﹤0.01% |
+10,165
| New | +$965K |
|
2871
PUT
Saia
SAIA
$8.63B
| $927K | ﹤0.01% |
2,200
-8,600
| -80% | -$3.78M |
|
2872
Martin Marietta Materials
MLM
$34.4B
| $926K | ﹤0.01% |
+1,606
| New | +$952K |
|
2873
Alexandria Real Estate Equities
ARE
$8.59B
| $926K | ﹤0.01% |
17,519
-7,271
| -29% | -$348K |
|
2874
PUT
Brinker International
EAT
$8.65B
| $924K | ﹤0.01% |
5,500
-1,600
| -23% | -$237K |
|
2875
PUT
AMC Entertainment Holdings
AMC
$2.62B
| $924K | ﹤0.01% |
486,300
+364,200
| +298% | +$627K |
|
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.