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 | |
|---|---|---|---|---|---|---|
4551
CALL
Beam Therapeutics
BEAM
$2.53B
| $227K | ﹤0.01% |
6,600
-3,300
| -33% | -$99.6K |
|
4552
CALL
Mid Penn Bancorp
MPB
$906M
| $226K | ﹤0.01% |
6,500
+4,900
| +306% | +$162K |
|
4553
TMC The Metals Company
TMC
$1.65B
| $226K | ﹤0.01% |
51,114
-73,977
| -59% | -$386K |
|
4554
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.8B
| $226K | ﹤0.01% |
5,100
-700
| -12% | -$35K |
|
|
BSOL
4555
CALL
Bitwise Solana Staking ETF
BSOL
$967M
| $226K | ﹤0.01% |
22,600
-15,700
| -41% | -$171K |
|
|
TGEN
4556
CALL
Tecogen Inc
TGEN
$89.1M
| $226K | ﹤0.01% |
43,300
+8,200
| +23% | +$41.1K |
|
4557
CALL
Clearway Energy Class C
CWEN
$6.01B
| $226K | ﹤0.01% |
6,600
-3,400
| -34% | -$132K |
|
|
DPRO
4558
PUT
Draganfly
DPRO
$230M
| $225K | ﹤0.01% |
41,600
-11,600
| -22% | -$67.2K |
|
4559
Grid Dynamics Holdings
GDYN
$620M
| $225K | ﹤0.01% |
39,630
+26,148
| +194% | +$162K |
|
4560
Invesco DB US Dollar Index Bearish Fund
UDN
$103M
| $225K | ﹤0.01% |
12,600
-17,881
| -59% | -$325K |
|
4561
CALL
Vishay Precision Group
VPG
$955M
| $225K | ﹤0.01% |
1,500
+600
| +67% | +$55.7K |
|
4562
CALL
3D Systems Corp
DDD
$585M
| $224K | ﹤0.01% |
74,100
+44,000
| +146% | +$120K |
|
|
SHAZ
4563
SharonAI Holdings
SHAZ
$1.94B
| $224K | ﹤0.01% |
+2,642
| New | +$149K |
|
4564
Apogee Enterprises
APOG
$748M
| $224K | ﹤0.01% |
4,890
+4,728
| +2,919% | +$177K |
|
4565
PUT
Procept Biorobotics
PRCT
$1.04B
| $224K | ﹤0.01% |
9,900
-900
| -8% | -$22.5K |
|
4566
CALL
Xenon Pharmaceuticals
XENE
$3.61B
| $223K | ﹤0.01% |
3,700
-47,600
| -93% | -$2.64M |
|
4567
ArriVent BioPharma
AVBP
$1.46B
| $223K | ﹤0.01% |
+6,428
| New | +$190K |
|
4568
CALL
NovaGold Resources
NG
$2.88B
| $223K | ﹤0.01% |
37,400
+19,500
| +109% | +$162K |
|
4569
PUT
RUM Group Inc
RUM
$3.83B
| $223K | ﹤0.01% |
35,200
+13,600
| +63% | +$96.6K |
|
4570
Myers Industries
MYE
$1.18B
| $223K | ﹤0.01% |
+6,317
| New | +$149K |
|
4571
CALL
Ollie's Bargain Outlet
OLLI
$5.15B
| $223K | ﹤0.01% |
2,900
+1,000
| +53% | +$83.4K |
|
|
OPLN
4572
CALL
Openlane
OPLN
$4.22B
| $223K | ﹤0.01% |
+5,400
| New | +$189K |
|
4573
CALL
MGP Ingredients
MGPI
$286M
| $223K | ﹤0.01% |
12,700
+12,500
| +6,250% | +$227K |
|
|
SRTA
4574
CALL
Strata Critical Medical Inc
SRTA
$451M
| $222K | ﹤0.01% |
42,200
-23,200
| -35% | -$122K |
|
4575
CALL
Vuzix
VUZI
$234M
| $222K | ﹤0.01% |
76,600
+49,500
| +183% | +$156K |
|
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.