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 | |
|---|---|---|---|---|---|---|
751
CALL
Truist Financial
TFC
$58.2B
| $10.2M | 0.01% |
203,900
+51,200
| +34% | +$2.52M |
|
752
PUT
Axsome Therapeutics
AXSM
$10.2B
| $10.2M | 0.01% |
41,500
+37,700
| +992% | +$8.18M |
|
753
PUT
PG&E
PCG
$37B
| $10.1M | 0.01% |
603,200
+379,600
| +170% | +$6.39M |
|
754
CALL
Coeur Mining
CDE
$19.8B
| $10.1M | 0.01% |
619,300
+34,100
| +6% | +$622K |
|
755
PUT
Oscar Health
OSCR
$9.14B
| $10.1M | 0.01% |
354,300
-239,300
| -40% | -$5.15M |
|
756
CALL
Cognizant
CTSH
$25.8B
| $10.1M | 0.01% |
260,700
+182,300
| +233% | +$9.6M |
|
757
PUT
Eos Energy Enterprises
EOSE
$1.15B
| $10.1M | 0.01% |
1,717,100
+60,300
| +4% | +$419K |
|
758
PUT
VanEck Durable High Dividend ETF
DURA
$44.5M
| $10.1M | 0.01% |
50,800
+10,600
| +26% | +$397K |
|
759
CALL
Quanta Services
PWR
$97.6B
| $10.1M | 0.01% |
14,000
-2,400
| -15% | -$1.64M |
|
760
VanEck Gold Miners ETF
GDX
$27.6B
| $10.1M | 0.01% |
133,483
+111,892
| +518% | +$9.89M |
|
761
PUT
Amkor Technology
AMKR
$13.3B
| $10M | 0.01% |
116,500
+87,100
| +296% | +$6.21M |
|
762
PUT
Vertex Pharmaceuticals
VRTX
$133B
| $10M | 0.01% |
20,200
-9,100
| -31% | -$4.03M |
|
763
Take-Two Interactive
TTWO
$37.7B
| $10M | 0.01% |
+40,136
| New | +$8.86M |
|
764
CALL
Blackrock
BLK
$168B
| $10M | 0.01% |
10,400
-7,400
| -42% | -$7.65M |
|
765
CALL
MGM Resorts International
MGM
$8.2B
| $9.97M | 0.01% |
208,500
+2,200
| +1% | +$91.4K |
|
766
CALL
Sunrun
RUN
$1.95B
| $9.89M | 0.01% |
739,100
+243,000
| +49% | +$3.28M |
|
767
CALL
Southwest Airlines
LUV
$20.9B
| $9.82M | 0.01% |
191,000
-136,200
| -42% | -$5.72M |
|
768
PUT
Duke Energy
DUK
$88.4B
| $9.78M | 0.01% |
77,300
+29,700
| +62% | +$3.75M |
|
769
CALL
Kroger
KR
$34.7B
| $9.78M | 0.01% |
176,100
-10,500
| -6% | -$685K |
|
770
CALL
CAVA Group
CAVA
$6.02B
| $9.76M | 0.01% |
124,400
+21,900
| +21% | +$1.84M |
|
771
Altria Group
MO
$115B
| $9.74M | 0.01% |
135,419
+94,751
| +233% | +$6.61M |
|
772
PUT
FedEx
FDX
$67.7B
| $9.69M | 0.01% |
71,300
+2,500
| +4% | +$908K |
|
773
CALL
Flex
FLEX
$42.4B
| $9.69M | 0.01% |
59,800
-23,800
| -28% | -$2.89M |
|
774
AST SpaceMobile
ASTS
$18.5B
| $9.67M | 0.01% |
108,871
+52,615
| +94% | +$4.59M |
|
775
CALL
NuScale Power
SMR
$3.46B
| $9.67M | 0.01% |
963,900
+297,000
| +45% | +$3.35M |
|
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.