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 | |
|---|---|---|---|---|---|---|
|
TPC
4076
CALL
Tutor Perini Cor
TPC
$4.41B
| $340K | ﹤0.01% |
4,100
+1,000
| +32% | +$80.5K |
|
4077
PUT
Newmark Group
NMRK
$2.26B
| $340K | ﹤0.01% |
22,500
+700
| +3% | +$10.7K |
|
|
BLSH
4078
PUT
Bullish
BLSH
$5.46B
| $340K | ﹤0.01% |
14,500
-19,000
| -57% | -$661K |
|
4079
Neumora Therapeutics
NMRA
$130M
| $340K | ﹤0.01% |
199,810
+70,654
| +55% | +$135K |
|
4080
Sonos
SONO
$2.13B
| $340K | ﹤0.01% |
+25,101
| New | +$367K |
|
4081
Satellogic
SATL
$930M
| $339K | ﹤0.01% |
59,301
-61,624
| -51% | -$451K |
|
4082
CALL
Acuity Brands
AYI
$9.16B
| $339K | ﹤0.01% |
900
+600
| +200% | +$178K |
|
|
PVLA
4083
Palvella Therapeutics
PVLA
$2.01B
| $339K | ﹤0.01% |
2,218
+596
| +37% | +$72.3K |
|
4084
CALL
Limbach Holdings
LMB
$579M
| $339K | ﹤0.01% |
4,400
+2,800
| +175% | +$233K |
|
4085
WEX
WEX
$6.03B
| $338K | ﹤0.01% |
+2,399
| New | +$355K |
|
4086
CALL
Structure Therapeutics
GPCR
$2.5B
| $338K | ﹤0.01% |
6,300
-13,000
| -67% | -$575K |
|
4087
Duos Technologies
DUOT
$283M
| $338K | ﹤0.01% |
28,171
+20,874
| +286% | +$210K |
|
4088
PUT
Janux Therapeutics
JANX
$1.01B
| $338K | ﹤0.01% |
22,000
+13,200
| +150% | +$191K |
|
4089
Leonardo DRS
DRS
$9.79B
| $337K | ﹤0.01% |
+7,889
| New | +$351K |
|
4090
CALL
Hyliion Holdings
HYLN
$707M
| $337K | ﹤0.01% |
64,600
-61,900
| -49% | -$258K |
|
4091
PUT
Alarm.com
ALRM
$2.64B
| $336K | ﹤0.01% |
7,200
+7,000
| +3,500% | +$314K |
|
4092
PUT
Fulcrum Therapeutics
FULC
$284M
| $336K | ﹤0.01% |
91,900
+61,400
| +201% | +$373K |
|
4093
CALL
Precigen
PGEN
$2.8B
| $336K | ﹤0.01% |
59,000
-49,500
| -46% | -$214K |
|
|
BLLN
4094
CALL
BillionToOne Inc
BLLN
$5.74B
| $336K | ﹤0.01% |
2,800
+1,100
| +65% | +$100K |
|
4095
CALL
Westlake Corp
WLK
$8.54B
| $336K | ﹤0.01% |
4,600
-1,500
| -25% | -$146K |
|
4096
PUT
NBT Bancorp
NBTB
$2.64B
| $336K | ﹤0.01% |
6,800
+400
| +6% | +$18.3K |
|
4097
PUT
Advanced Energy
AEIS
$11.1B
| $336K | ﹤0.01% |
900
-2,400
| -73% | -$839K |
|
4098
PUT
Verra Mobility
VRRM
$454M
| $335K | ﹤0.01% |
+78,900
| New | +$833K |
|
4099
PUT
Harmony Biosciences
HRMY
$2.33B
| $335K | ﹤0.01% |
9,200
+600
| +7% | +$18.9K |
|
4100
PUT
Edwards Lifesciences
EW
$50B
| $335K | ﹤0.01% |
3,700
-5,000
| -57% | -$419K |
|
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.