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 | |
|---|---|---|---|---|---|---|
801
CALL
Duke Energy
DUK
$88.4B
| $9.22M | 0.01% |
72,800
+7,200
| +11% | +$908K |
|
802
CALL
O'Reilly Automotive
ORLY
$69.7B
| $9.19M | 0.01% |
99,800
+44,000
| +79% | +$4.01M |
|
803
Cigna
CI
$71.9B
| $9.19M | 0.01% |
33,324
-64,879
| -66% | -$18.3M |
|
804
CALL
Viking Therapeutics
VKTX
$4.15B
| $9.17M | 0.01% |
235,000
-40,600
| -15% | -$1.31M |
|
805
PUT
Varonis Systems
VRNS
$5.31B
| $9.16M | 0.01% |
218,300
+176,600
| +424% | +$5.18M |
|
806
CALL
Advance Auto Parts
AAP
$2.52B
| $9.13M | 0.01% |
146,700
-5,900
| -4% | -$335K |
|
807
PUT
Energy Transfer Partners
ET
$69.5B
| $9.11M | 0.01% |
476,400
+109,900
| +30% | +$2.13M |
|
808
CALL
Restaurant Brands International
QSR
$25B
| $9.09M | 0.01% |
125,400
+49,200
| +65% | +$3.75M |
|
809
PUT
Kimberly-Clark
KMB
$32.7B
| $9.09M | 0.01% |
82,800
-15,000
| -15% | -$1.49M |
|
810
CALL
CarMax
KMX
$8.12B
| $9.09M | 0.01% |
171,800
-36,200
| -17% | -$1.58M |
|
811
Comcast
CMCSA
$77.8B
| $9.08M | 0.01% |
370,028
+251,640
| +213% | +$6.49M |
|
812
CALL
Planet Labs
PL
$6.34B
| $9.07M | 0.01% |
273,800
-52,500
| -16% | -$1.94M |
|
813
Fortinet
FTNT
$127B
| $9.07M | 0.01% |
59,034
+20,705
| +54% | +$2.39M |
|
|
KOCG
814
CALL
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $9.05M | 0.01% |
171,900
+27,900
| +19% | +$1.47M |
|
815
CALL
Aflac
AFL
$57B
| $9.05M | 0.01% |
77,200
+32,600
| +73% | +$3.75M |
|
816
CALL
APA Corp
APA
$15B
| $9.05M | 0.01% |
277,900
-233,400
| -46% | -$8.76M |
|
817
CALL
Pinterest
PINS
$10.7B
| $9.03M | 0.01% |
429,600
-212,700
| -33% | -$4.27M |
|
818
PUT
Centene
CNC
$30.5B
| $9.03M | 0.01% |
140,700
+38,500
| +38% | +$2.06M |
|
|
PENG
819
CALL
Penguin Solutions Inc
PENG
$2.88B
| $9.01M | 0.01% |
118,600
+110,300
| +1,329% | +$5.02M |
|
820
PUT
MaxLinear
MXL
$8.51B
| $8.97M | 0.01% |
70,100
+69,400
| +9,914% | +$4.91M |
|
821
Vistra
VST
$46.5B
| $8.96M | 0.01% |
56,502
+43,047
| +320% | +$6.68M |
|
822
PUT
Medtronic
MDT
$113B
| $8.93M | 0.01% |
114,100
+63,100
| +124% | +$5.09M |
|
823
PUT
Toast
TOST
$17.7B
| $8.92M | 0.01% |
320,700
+256,100
| +396% | +$6.68M |
|
824
CALL
Generac Holdings
GNRC
$12.3B
| $8.9M | 0.01% |
30,400
-13,000
| -30% | -$3.26M |
|
825
PUT
Vishay Intertechnology
VSH
$4.99B
| $8.9M | 0.01% |
+165,400
| New | +$6.77M |
|
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.