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 | |
|---|---|---|---|---|---|---|
2826
PUT
Equitable Holdings
EQH
$14.7B
| $961K | ﹤0.01% |
21,900
-2,500
| -10% | -$105K |
|
2827
PUT
Regions Financial
RF
$23.5B
| $960K | ﹤0.01% |
31,800
+3,100
| +11% | +$87K |
|
|
HIVE
2828
HIVE Digital Technologies
HIVE
$867M
| $960K | ﹤0.01% |
263,745
+206,218
| +358% | +$666K |
|
2829
PUT
Harmony Gold Mining
HMY
$11.9B
| $960K | ﹤0.01% |
63,100
-22,800
| -27% | -$379K |
|
2830
PUT
Liberty Global Class C
LBTYK
$3.16B
| $960K | ﹤0.01% |
85,800
-11,400
| -12% | -$132K |
|
2831
CALL
Birkenstock
BIRK
$5.55B
| $960K | ﹤0.01% |
22,300
-37,800
| -63% | -$1.53M |
|
2832
PUT
AnaptysBio
ANAB
$1.52B
| $959K | ﹤0.01% |
14,200
+14,100
| +14,100% | +$855K |
|
2833
CALL
Gevo
GEVO
$346M
| $958K | ﹤0.01% |
638,800
-79,500
| -11% | -$140K |
|
2834
CALL
Cellebrite
CLBT
$2.71B
| $958K | ﹤0.01% |
65,600
+35,500
| +118% | +$469K |
|
2835
CALL
Aquestive Therapeutics
AQST
$587M
| $958K | ﹤0.01% |
230,200
+40,800
| +22% | +$172K |
|
2836
PUT
Century Aluminum
CENX
$3.8B
| $957K | ﹤0.01% |
20,800
-5,200
| -20% | -$313K |
|
2837
CALL
InMode
INMD
$821M
| $956K | ﹤0.01% |
65,400
+30,500
| +87% | +$426K |
|
2838
PUT
TTM Technologies
TTMI
$13.6B
| $954K | ﹤0.01% |
5,100
-62,400
| -92% | -$10.1M |
|
2839
PUT
A.O. Smith
AOS
$7.97B
| $953K | ﹤0.01% |
15,200
+7,000
| +85% | +$424K |
|
2840
CALL
Old Dominion Freight Line
ODFL
$35.9B
| $953K | ﹤0.01% |
4,400
-900
| -17% | -$194K |
|
2841
CALL
Ameren
AEE
$27.5B
| $950K | ﹤0.01% |
8,400
+8,000
| +2,000% | +$884K |
|
2842
PUT
Illumina
ILMN
$40.8B
| $949K | ﹤0.01% |
5,400
-5,100
| -49% | -$747K |
|
|
VOYG
2843
CALL
Voyager Technologies
VOYG
$1.91B
| $948K | ﹤0.01% |
29,400
-14,400
| -33% | -$498K |
|
2844
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.43B
| $948K | ﹤0.01% |
13,900
+900
| +7% | +$45.3K |
|
2845
CALL
Life Time Group Holdings
LTH
$8.93B
| $947K | ﹤0.01% |
23,200
+23,000
| +11,500% | +$730K |
|
2846
CALL
Custom Truck One Source
CTOS
$2.15B
| $947K | ﹤0.01% |
+80,200
| New | +$755K |
|
2847
PUT
ESAB
ESAB
$4.47B
| $947K | ﹤0.01% |
9,600
+9,400
| +4,700% | +$908K |
|
2848
NCR Voyix
VYX
$976M
| $947K | ﹤0.01% |
115,852
+59,770
| +107% | +$421K |
|
2849
CALL
Gladstone Investment Corp
GAIN
$630M
| $946K | ﹤0.01% |
61,200
+12,600
| +26% | +$198K |
|
2850
PUT
Robert Half
RHI
$3.78B
| $946K | ﹤0.01% |
30,800
+22,200
| +258% | +$622K |
|
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.