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 | |
|---|---|---|---|---|---|---|
|
SMST
4876
CALL
Defiance Daily Target 2x Short MSTR ETF
SMST
$30.6M
| $176K | ﹤0.01% |
28,500
+9,700
| +52% | +$423K |
|
4877
PUT
Rollins
ROL
$14.7B
| $175K | ﹤0.01% |
+4,200
| New | +$215K |
|
|
GPMT
4878
CALL
Granite Point Mortgage Trust
GPMT
$42.8M
| $175K | ﹤0.01% |
116,800
+116,400
| +29,100% | +$167K |
|
|
MIAX
4879
CALL
Miami International Holdings
MIAX
$3.36B
| $175K | ﹤0.01% |
4,700
+2,100
| +81% | +$93.9K |
|
4880
Brookfield Infrastructure Partners
BIP
$16.3B
| $174K | ﹤0.01% |
4,782
+4,666
| +4,022% | +$174K |
|
4881
CALL
Appian
APPN
$2.53B
| $174K | ﹤0.01% |
7,600
+5,600
| +280% | +$125K |
|
4882
PUT
Morgan Stanley Direct Lending Fund
MSDL
$1.2B
| $174K | ﹤0.01% |
11,500
-1,500
| -12% | -$22.7K |
|
4883
PUT
Newell Brands
NWL
$2.27B
| $174K | ﹤0.01% |
28,300
-1,100
| -4% | -$4.65K |
|
|
ACH
4884
CALL
Accendra Health
ACH
$47.1M
| $174K | ﹤0.01% |
50,800
-2,500
| -5% | -$7.77K |
|
|
EXK
4885
Endeavour Silver
EXK
$2.59B
| $174K | ﹤0.01% |
+20,972
| New | +$195K |
|
4886
CALL
Piper Sandler
PIPR
$4.57B
| $174K | ﹤0.01% |
2,400
-16,800
| -88% | -$1.36M |
|
|
WLTH
4887
PUT
Wealthfront Corp
WLTH
$1.58B
| $173K | ﹤0.01% |
19,400
-6,100
| -24% | -$63.5K |
|
|
EMPD
4888
CALL
Empery Digital
EMPD
$88.7M
| $173K | ﹤0.01% |
+48,600
| New | +$217K |
|
4889
CALL
Martin Marietta Materials
MLM
$34B
| $173K | ﹤0.01% |
300
-900
| -75% | -$534K |
|
4890
CALL
Global Ship Lease
GSL
$1.59B
| $173K | ﹤0.01% |
4,600
-1,200
| -21% | -$46.8K |
|
4891
Ribbon Communications
RBBN
$320M
| $173K | ﹤0.01% |
+73,875
| New | +$195K |
|
4892
CALL
Cumberland Pharmaceuticals
CPIX
$115M
| $172K | ﹤0.01% |
26,600
+19,500
| +275% | +$93.5K |
|
|
BOT
4893
RoboStrategy Inc
BOT
$643M
| $172K | ﹤0.01% |
+4,335
| New | +$134K |
|
4894
CALL
Invesco Mortgage Capital
IVR
$682M
| $172K | ﹤0.01% |
21,800
+19,900
| +1,047% | +$160K |
|
4895
Alector
ALEC
$209M
| $172K | ﹤0.01% |
85,488
+17,011
| +25% | +$36.5K |
|
4896
Bankunited
BKU
$3.03B
| $172K | ﹤0.01% |
3,545
+393
| +12% | +$18.5K |
|
4897
CALL
AMC Global Media
AMCX
$476M
| $172K | ﹤0.01% |
17,200
+6,600
| +62% | +$58.5K |
|
4898
CALL
AAR Corp
AIR
$4.3B
| $172K | ﹤0.01% |
1,200
+800
| +200% | +$94.5K |
|
4899
CALL
Pinnacle Financial Partners Inc
PNFP
$14.1B
| $171K | ﹤0.01% |
1,700
+800
| +89% | +$76.8K |
|
|
ANGX
4900
CALL
Angel Studios
ANGX
$870M
| $171K | ﹤0.01% |
46,700
+40,200
| +618% | +$114K |
|
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.