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 | |
|---|---|---|---|---|---|---|
901
CALL
On Holding
ONON
$10B
| $7.88M | ﹤0.01% |
222,400
-14,600
| -6% | -$534K |
|
902
PUT
SAP
SAP
$243B
| $7.88M | ﹤0.01% |
51,100
+33,800
| +195% | +$5.76M |
|
903
PUT
Navitas Semiconductor
NVTS
$3.2B
| $7.86M | ﹤0.01% |
438,400
+241,200
| +122% | +$4.6M |
|
904
CALL
Sysco
SYY
$37.6B
| $7.85M | ﹤0.01% |
93,900
+70,900
| +308% | +$5.37M |
|
905
PUT
APA Corp
APA
$15B
| $7.85M | ﹤0.01% |
240,900
-44,600
| -16% | -$1.67M |
|
|
KEEL
906
Keel Infrastructure Corp
KEEL
$2.35B
| $7.84M | ﹤0.01% |
1,366,617
+44,963
| +3% | +$193K |
|
907
CALL
Southern Copper
SCCO
$172B
| $7.84M | ﹤0.01% |
45,540
+17,432
| +62% | +$3.13M |
|
908
CALL
Bitdeer Technologies
BTDR
$3.13B
| $7.77M | ﹤0.01% |
489,700
-10,700
| -2% | -$154K |
|
909
PUT
Toronto Dominion Bank
TD
$198B
| $7.76M | ﹤0.01% |
63,900
-23,500
| -27% | -$2.57M |
|
910
PUT
Atlassian
TEAM
$47.5B
| $7.76M | ﹤0.01% |
99,700
+13,100
| +15% | +$1.07M |
|
911
PUT
Union Pacific
UNP
$163B
| $7.75M | ﹤0.01% |
28,500
-41,000
| -59% | -$10.8M |
|
912
PUT
Cintas
CTAS
$79.9B
| $7.74M | ﹤0.01% |
45,500
+33,300
| +273% | +$5.76M |
|
913
PUT
TPG
TPG
$7.4B
| $7.74M | ﹤0.01% |
190,800
+55,000
| +41% | +$2.31M |
|
914
PUT
Celsius Holdings
CELH
$7.08B
| $7.73M | ﹤0.01% |
264,000
+74,400
| +39% | +$2.35M |
|
915
Akamai
AKAM
$16.4B
| $7.72M | ﹤0.01% |
65,275
+46,872
| +255% | +$5.84M |
|
|
KEEL
916
PUT
Keel Infrastructure Corp
KEEL
$2.35B
| $7.71M | ﹤0.01% |
1,342,900
+98,000
| +8% | +$421K |
|
917
CALL
Southern Company
SO
$95.3B
| $7.7M | ﹤0.01% |
80,400
-65,400
| -45% | -$6.16M |
|
918
PUT
Wheaton Precious Metals
WPM
$64.9B
| $7.69M | ﹤0.01% |
68,500
+15,000
| +28% | +$1.95M |
|
919
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $7.69M | ﹤0.01% |
76,700
+30,600
| +66% | +$2.68M |
|
920
PUT
Digital Realty Trust
DLR
$66.3B
| $7.69M | ﹤0.01% |
42,800
+27,800
| +185% | +$5.32M |
|
|
P
921
CALL
Everpure Inc
P
$42B
| $7.68M | ﹤0.01% |
97,500
+22,700
| +30% | +$1.66M |
|
922
CALL
JPMorgan Inflation Managed Bond ETF
JCPI
$880M
| $7.66M | ﹤0.01% |
124,600
+26,000
| +26% | +$1.26M |
|
923
CALL
Wendy's
WEN
$1.25B
| $7.66M | ﹤0.01% |
923,500
+322,200
| +54% | +$2.3M |
|
924
PUT
EOG Resources
EOG
$73.6B
| $7.63M | ﹤0.01% |
58,800
-8,400
| -13% | -$1.14M |
|
925
PUT
Ondas Inc
ONDS
$4.45B
| $7.59M | ﹤0.01% |
921,200
-736,600
| -44% | -$7.27M |
|
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.