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 | |
|---|---|---|---|---|---|---|
3801
PUT
Eversource Energy
ES
$23.8B
| $426K | ﹤0.01% |
5,900
-5,700
| -49% | -$395K |
|
3802
CALL
Nordic American Tanker
NAT
$1.65B
| $426K | ﹤0.01% |
76,900
-56,000
| -42% | -$317K |
|
|
SPCH
3803
Leverage Shares 2X Long SPCX Daily ETF
SPCH
$352M
| $426K | ﹤0.01% |
+27,800
| New | +$445K |
|
|
USAS
3804
CALL
Americas Gold and Silver
USAS
$1.52B
| $426K | ﹤0.01% |
90,200
+22,800
| +34% | +$132K |
|
3805
CALL
PubMatic
PUBM
$839M
| $425K | ﹤0.01% |
32,400
-43,000
| -57% | -$447K |
|
3806
US Gold Corp
USAU
$245M
| $425K | ﹤0.01% |
27,710
+23,369
| +538% | +$370K |
|
3807
CALL
EyePoint Inc
EYPT
$285M
| $425K | ﹤0.01% |
29,700
+11,600
| +64% | +$155K |
|
|
TWO
3808
PUT
DELISTED
Two Harbors Investment
TWO
| $424K | ﹤0.01% |
34,200
-4,300
| -11% | -$51.4K |
|
3809
CALL
Alkermes
ALKS
$6.74B
| $424K | ﹤0.01% |
8,100
+6,400
| +376% | +$250K |
|
3810
CALL
Prospect Capital
PSEC
$1.14B
| $424K | ﹤0.01% |
183,500
+41,100
| +29% | +$101K |
|
3811
PUT
Moog Inc Class A
MOG.A
$12.4B
| $424K | ﹤0.01% |
1,000
+800
| +400% | +$273K |
|
3812
Alamos Gold
AGI
$13.7B
| $424K | ﹤0.01% |
+13,965
| New | +$566K |
|
3813
CALL
Medpace
MEDP
$17.2B
| $424K | ﹤0.01% |
800
| – | – |
|
3814
CALL
Lazard
LAZ
$3.49B
| $424K | ﹤0.01% |
10,100
+7,600
| +304% | +$348K |
|
3815
PUT
Scholar Rock
SRRK
$5.98B
| $424K | ﹤0.01% |
7,700
+7,300
| +1,825% | +$353K |
|
3816
PUT
Logitech
LOGI
$14.4B
| $423K | ﹤0.01% |
4,500
-5,400
| -55% | -$560K |
|
|
NXH
3817
PUT
Neighborhood Intelligence Inc
NXH
$300M
| $423K | ﹤0.01% |
423,900
-70,800
| -14% | -$388K |
|
3818
Structure Therapeutics
GPCR
$2.5B
| $422K | ﹤0.01% |
+7,871
| New | +$348K |
|
3819
CALL
Arcutis Biotherapeutics
ARQT
$3.44B
| $422K | ﹤0.01% |
16,100
+200
| +1% | +$4.66K |
|
3820
Fidelity National Information Services
FIS
$17.7B
| $422K | ﹤0.01% |
10,852
+1,925
| +22% | +$83.3K |
|
3821
KBR
KBR
$4.39B
| $422K | ﹤0.01% |
12,219
+6,789
| +125% | +$237K |
|
3822
CALL
Twist Bioscience
TWST
$11.9B
| $422K | ﹤0.01% |
4,100
+500
| +14% | +$32.5K |
|
3823
PUT
Weyerhaeuser
WY
$14.2B
| $421K | ﹤0.01% |
17,600
+4,700
| +36% | +$114K |
|
3824
CALL
Rayonier
RYN
$5.59B
| $419K | ﹤0.01% |
19,700
+4,500
| +30% | +$94.3K |
|
3825
CALL
Franklin Templeton
BEN
$16.6B
| $419K | ﹤0.01% |
12,600
-35,500
| -74% | -$1.06M |
|
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.