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 | |
|---|---|---|---|---|---|---|
2726
GXO Logistics
GXO
$5.18B
| $1.05M | ﹤0.01% |
20,666
-4,097
| -17% | -$212K |
|
|
ORKA
2727
PUT
Oruka Therapeutics
ORKA
$5.59B
| $1.05M | ﹤0.01% |
11,000
-8,300
| -43% | -$553K |
|
2728
PUT
Alcon
ALC
$31.2B
| $1.05M | ﹤0.01% |
15,600
+8,300
| +114% | +$581K |
|
2729
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$82.9M
| $1.05M | ﹤0.01% |
8,200
+6,800
| +486% | +$878K |
|
|
RGTX
2730
PUT
Defiance Daily Target 2X Long RGTI ETF
RGTX
$51.7M
| $1.05M | ﹤0.01% |
29,600
-9,500
| -24% | -$222K |
|
2731
CALL
Alliant Energy
LNT
$16.5B
| $1.05M | ﹤0.01% |
13,700
+8,100
| +145% | +$590K |
|
2732
First Trust NASDAQ Cybersecurity ETF
CIBR
$16.8B
| $1.04M | ﹤0.01% |
+11,626
| New | +$892K |
|
2733
CALL
CG Oncology
CGON
$5.95B
| $1.04M | ﹤0.01% |
14,700
+1,100
| +8% | +$71.9K |
|
2734
CALL
Intellia Therapeutics
NTLA
$1.65B
| $1.04M | ﹤0.01% |
61,700
-346,200
| -85% | -$4.85M |
|
|
OPRA
2735
CALL
Opera Ltd
OPRA
$1.57B
| $1.04M | ﹤0.01% |
52,400
+400
| +0.8% | +$7.07K |
|
2736
MSCI
MSCI
$40.1B
| $1.04M | ﹤0.01% |
1,855
+1,235
| +199% | +$721K |
|
|
KRMN
2737
CALL
Karman Holdings
KRMN
$4.73B
| $1.04M | ﹤0.01% |
20,800
+13,100
| +170% | +$847K |
|
2738
CALL
Starwood Property Trust
STWD
$5.32B
| $1.04M | ﹤0.01% |
63,300
-3,000
| -5% | -$52.2K |
|
2739
CALL
Vestis
VSTS
$1.8B
| $1.04M | ﹤0.01% |
71,400
+70,400
| +7,040% | +$785K |
|
2740
Zimmer Biomet
ZBH
$17.4B
| $1.04M | ﹤0.01% |
12,032
+5,145
| +75% | +$451K |
|
|
KLAR
2741
Klarna Group
KLAR
$4.85B
| $1.03M | ﹤0.01% |
+51,035
| New | +$804K |
|
2742
ProShares UltraPro Short QQQ
SQQQ
$2.17B
| $1.03M | ﹤0.01% |
28,410
-60,233
| -68% | -$2.91M |
|
2743
Lamb Weston
LW
$5.99B
| $1.03M | ﹤0.01% |
23,841
-11,131
| -32% | -$480K |
|
2744
CALL
Under Armour Class C
UA
$1.88B
| $1.03M | ﹤0.01% |
162,300
-45,800
| -22% | -$264K |
|
2745
Lennar Class A
LEN
$19.8B
| $1.03M | ﹤0.01% |
11,351
+7,889
| +228% | +$705K |
|
|
AMRZ
2746
Amrize Ltd
AMRZ
$20.9B
| $1.03M | ﹤0.01% |
19,267
+1,586
| +9% | +$85.9K |
|
2747
PUT
CDW
CDW
$16.9B
| $1.03M | ﹤0.01% |
7,300
+3,700
| +103% | +$465K |
|
2748
Crane Co
CR
$12B
| $1.02M | ﹤0.01% |
+4,594
| New | +$866K |
|
2749
HDFC Bank
HDB
$118B
| $1.02M | ﹤0.01% |
39,645
-5,266
| -12% | -$132K |
|
2750
PUT
DaVita
DVA
$11.4B
| $1.02M | ﹤0.01% |
4,600
+1,400
| +44% | +$254K |
|
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.