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 | Held Since | |
|---|---|---|---|---|---|---|---|
6676
CALL
Alamo Group
ALG
$1.78B
| $32.9K | ﹤0.01% |
+200
| New | +$32.3K |
2026 Q2
0 quarters
|
|
6677
Dream Finders Homes
DFH
$935M
| $32.8K | ﹤0.01% |
1,900
-362
| -16% | -$5.32K |
2024 Q3
7 quarters
|
|
6678
Ocugen
OCGN
$244M
| $32.7K | ﹤0.01% |
+21,381
| New | +$32.5K |
2026 Q2
0 quarters
|
|
6679
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$882M
| $32.6K | ﹤0.01% |
746
-531
| -42% | -$25.5K |
2025 Q4
2 quarters
|
|
6680
CALL
Niu Technologies
NIU
$144M
| $32.6K | ﹤0.01% |
16,200
| – | – |
2025 Q1
5 quarters
|
|
6681
Tradr 2X Long U Daily ETF
UNX
$1.36M
| $32.6K | ﹤0.01% |
+2,820
| New | +$29.7K |
2026 Q2
0 quarters
|
|
6682
CALL
Diversified Healthcare Trust
DHC
$1.89B
| $32.6K | ﹤0.01% |
+3,500
| New | +$28.7K |
2026 Q2
0 quarters
|
|
6683
PUT
Bread Financial
BFH
$3.91B
| $32.5K | ﹤0.01% |
+300
| New | +$26.9K |
2026 Q2
0 quarters
|
|
6684
CALL
Novanta
NOVT
$5.53B
| $32.4K | ﹤0.01% |
200
+100
| +100% | +$14.5K |
2026 Q1
1 quarter
|
|
6685
State Street SPDR Portfolio High Yield Bond ETF
SPHY
$11.8B
| $32.4K | ﹤0.01% |
1,383
-810
| -37% | -$19K |
2026 Q1
1 quarter
|
|
6686
PUT
Invesco Mortgage Capital
IVR
$597M
| $32.4K | ﹤0.01% |
4,100
-14,400
| -78% | -$116K |
2026 Q1
1 quarter
|
|
6687
PUT
AC Immune
ACIU
$236M
| $32.4K | ﹤0.01% |
13,600
+13,500
| +13,500% | +$37.2K |
2025 Q4
2 quarters
|
|
6688
CALL
Autohome
ATHM
$2.37B
| $32.4K | ﹤0.01% |
+1,700
| New | +$30.7K |
2026 Q2
0 quarters
|
|
6689
CALL
Franklin Electric
FELE
$4.42B
| $32.2K | ﹤0.01% |
300
+200
| +200% | +$20.1K |
2026 Q1
1 quarter
|
|
6690
First Trust Exchange-Traded Fund II First Trust Indxx Global Agriculture ETF
FTAG
$13.9M
| $32.1K | ﹤0.01% |
1,111
+983
| +768% | +$28.9K |
2026 Q1
1 quarter
|
|
6691
PUT
AppFolio
APPF
$7.65B
| $32.1K | ﹤0.01% |
+200
| New | +$31.9K |
2026 Q2
0 quarters
|
|
6692
PUT
Lifecore Biomedical
LFCR
$244M
| $32K | ﹤0.01% |
6,100
-3,300
| -35% | -$16.6K |
2024 Q3
7 quarters
|
|
6693
Roundhill Gold Miners WeeklyPay ETF
GDXW
$59.5M
| $32K | ﹤0.01% |
882
+334
| +61% | +$16K |
2026 Q1
1 quarter
|
|
6694
VanEck Social Sentiment ETF
BUZZ
$91M
| $32K | ﹤0.01% |
866
+656
| +312% | +$23.3K |
2025 Q4
2 quarters
|
|
6695
CALL
HBT Financial
HBT
$1.35B
| $32K | ﹤0.01% |
1,000
-100
| -9% | -$2.88K |
2026 Q1
1 quarter
|
|
6696
PUT
Mercury Insurance
MCY
$5.7B
| $32K | ﹤0.01% |
300
-100
| -25% | -$9.8K |
2026 Q1
1 quarter
|
|
6697
Franklin Covey
FC
$211M
| $31.9K | ﹤0.01% |
1,302
+1,288
| +9,200% | +$29.4K |
2025 Q4
2 quarters
|
|
6698
PUT
DXC Technology
DXC
$2.59B
| $31.9K | ﹤0.01% |
3,600
-11,600
| -76% | -$120K |
2017 Q4
34 quarters
|
|
6699
CALL
DELISTED
CBL& Associates Properties, Inc.
CBL
| $31.9K | ﹤0.01% |
600
-100
| -14% | -$5.31K |
2022 Q3
15 quarters
|
|
6700
CALL
Metallus
MTUS
$847M
| $31.8K | ﹤0.01% |
+1,700
| New | +$31.9K |
2026 Q2
0 quarters
|
|
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.