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 | |
|---|---|---|---|---|---|---|
|
TLN
826
CALL
Talen Energy Corp
TLN
$14.6B
| $8.88M | 0.01% |
23,100
+8,200
| +55% | +$3.01M |
|
827
CALL
Toast
TOST
$17.7B
| $8.87M | 0.01% |
319,000
+22,100
| +7% | +$576K |
|
828
CALL
Opendoor
OPEN
$2.5B
| $8.86M | 0.01% |
2,839,500
+74,300
| +3% | +$356K |
|
829
CALL
Bilibili
BILI
$6.13B
| $8.81M | 0.01% |
517,300
+297,400
| +135% | +$6.02M |
|
830
CALL
PPG Industries
PPG
$23.9B
| $8.78M | 0.01% |
72,400
+54,800
| +311% | +$6.1M |
|
831
PUT
BlackBerry
BB
$4.82B
| $8.76M | 0.01% |
692,700
+585,900
| +549% | +$4.09M |
|
832
PUT
Knight Transportation
KNX
$10.4B
| $8.76M | 0.01% |
112,500
+56,300
| +100% | +$3.9M |
|
833
CALL
MPLX
MPLX
$57.6B
| $8.75M | 0.01% |
155,400
-71,600
| -32% | -$3.99M |
|
834
CALL
CME Group
CME
$95.1B
| $8.74M | 0.01% |
39,600
+19,400
| +96% | +$5.37M |
|
|
EXE
835
CALL
Expand Energy Corp
EXE
$20.1B
| $8.74M | 0.01% |
95,800
-91,200
| -49% | -$8.66M |
|
836
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$125M
| $8.72M | 0.01% |
394,300
+57,700
| +17% | +$1.57M |
|
837
CALL
Enbridge
ENB
$104B
| $8.71M | 0.01% |
160,600
-24,800
| -13% | -$1.36M |
|
838
CALL
Caesars Entertainment
CZR
$6.03B
| $8.67M | 0.01% |
287,400
-189,700
| -40% | -$5.35M |
|
839
CALL
Nutanix
NTNX
$18.4B
| $8.66M | 0.01% |
169,900
+155,000
| +1,040% | +$7M |
|
840
CALL
United States Copper Index Fund
CPER
$759M
| $8.63M | 0.01% |
228,800
-39,100
| -15% | -$1.47M |
|
841
CALL
The GEO Group
GEO
$4.11B
| $8.62M | 0.01% |
291,600
-190,900
| -40% | -$4.33M |
|
842
PUT
AerCap
AER
$23.5B
| $8.57M | 0.01% |
58,800
+30,200
| +106% | +$4.29M |
|
843
PUT
Pagaya Technologies
PGY
$1.47B
| $8.57M | 0.01% |
469,400
+290,200
| +162% | +$4.12M |
|
844
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.2B
| $8.56M | 0.01% |
+16,391
| New | +$8.19M |
|
|
845
CALL
AerCap
AER
$23.5B
| $8.56M | 0.01% |
58,700
+6,600
| +13% | +$937K |
|
846
CALL
PNC Financial Services
PNC
$90B
| $8.54M | 0.01% |
34,700
+7,500
| +28% | +$1.68M |
|
847
CALL
Kimberly-Clark
KMB
$32.7B
| $8.54M | 0.01% |
77,800
+43,600
| +127% | +$4.32M |
|
|
PSKY
848
CALL
Paramount Skydance Corp
PSKY
$11.2B
| $8.51M | 0.01% |
863,300
+375,900
| +77% | +$3.96M |
|
849
CALL
Cytokinetics
CYTK
$8.99B
| $8.5M | 0.01% |
99,800
-33,500
| -25% | -$2.41M |
|
850
PUT
Bank of Montreal
BMO
$120B
| $8.5M | 0.01% |
48,100
+13,900
| +41% | +$2.18M |
|
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.