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 | |
|---|---|---|---|---|---|---|
5776
CALL
StoneX
SNEX
$8.38B
| $83K | ﹤0.01% |
+1,050
| New | +$78.8K |
|
5777
Global X Defense Tech ETF
SHLD
$6.97B
| $82.9K | ﹤0.01% |
1,388
-11,920
| -90% | -$793K |
|
5778
CALL
Vertical Aerospace
EVTL
$103M
| $82.8K | ﹤0.01% |
47,600
+33,000
| +226% | +$79.3K |
|
5779
CALL
Cardiff Oncology
CRDF
$84.8M
| $82.7K | ﹤0.01% |
63,600
+4,800
| +8% | +$7.62K |
|
5780
Labcorp
LH
$26.5B
| $82.6K | ﹤0.01% |
295
+81
| +38% | +$21.3K |
|
|
INR
5781
PUT
Infinity Natural Resources
INR
$291M
| $82.5K | ﹤0.01% |
+6,500
| New | +$96.7K |
|
5782
CALL
Sumitomo Mitsui Financial
SMFG
$173B
| $82.5K | ﹤0.01% |
3,500
-1,100
| -24% | -$24.4K |
|
5783
Prairie Operating Co
PROP
$51.1M
| $82.2K | ﹤0.01% |
113,984
-190,302
| -63% | -$205K |
|
5784
Diodes
DIOD
$4.23B
| $82.2K | ﹤0.01% |
+751
| New | +$76.2K |
|
|
NREF
5785
CALL
NexPoint Real Estate Finance
NREF
$335M
| $82.2K | ﹤0.01% |
+5,300
| New | +$78.8K |
|
5786
PUT
Boot Barn
BOOT
$4.67B
| $82.1K | ﹤0.01% |
500
-2,200
| -81% | -$357K |
|
5787
CALL
Calix
CALX
$2.26B
| $82.1K | ﹤0.01% |
+2,200
| New | +$92.3K |
|
5788
PUT
GoodRx Holdings
GDRX
$1.19B
| $82.1K | ﹤0.01% |
28,500
-39,700
| -58% | -$101K |
|
|
OGI
5789
CALL
Organigram Holdings
OGI
$167M
| $82K | ﹤0.01% |
80,400
-11,800
| -13% | -$14.4K |
|
5790
PUT
CoinShares Bitcoin and Ether ETF
BTF
$16.3M
| $82K | ﹤0.01% |
1,300
-13,200
| -91% | -$256K |
|
|
DFDV
5791
CALL
DeFi Development Corp
DFDV
$182M
| $81.8K | ﹤0.01% |
50,700
-6,600
| -12% | -$25.3K |
|
5792
CALL
News Corp Class B
NWS
$18.2B
| $81.7K | ﹤0.01% |
3,200
+400
| +14% | +$11.9K |
|
|
ACR
5793
ACRES Commercial Realty
ACR
$102M
| $81.7K | ﹤0.01% |
4,592
+2,637
| +135% | +$51.6K |
|
5794
CALL
Barnes & Noble Education
BNED
$441M
| $81.6K | ﹤0.01% |
6,500
-8,300
| -56% | -$86.7K |
|
5795
PUT
Flowserve
FLS
$9.74B
| $81.6K | ﹤0.01% |
1,100
-2,300
| -68% | -$175K |
|
5796
PUT
Immix Biopharma
IMMX
$990M
| $81.4K | ﹤0.01% |
7,900
-4,700
| -37% | -$43.6K |
|
5797
PUT
Arcutis Biotherapeutics
ARQT
$3B
| $81.3K | ﹤0.01% |
3,100
-1,100
| -26% | -$25.6K |
|
5798
PUT
Entravision Communication
EVC
$777M
| $80.8K | ﹤0.01% |
6,200
+3,700
| +148% | +$26.2K |
|
5799
PUT
C4 Therapeutics
CCCC
$463M
| $80.8K | ﹤0.01% |
+17,300
| New | +$59.2K |
|
5800
Unisys
UIS
$191M
| $80.7K | ﹤0.01% |
+22,042
| New | +$69.1K |
|
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.