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 | |
|---|---|---|---|---|---|---|
4501
RB Global
RBA
$15B
| $235K | ﹤0.01% |
2,020
-160
| -7% | -$16.8K |
|
4502
PUT
ICU Medical
ICUI
$4.07B
| $235K | ﹤0.01% |
1,600
+1,500
| +1,500% | +$196K |
|
4503
Pembina Pipeline
PBA
$25.9B
| $234K | ﹤0.01% |
+5,070
| New | +$235K |
|
4504
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.91M
| $234K | ﹤0.01% |
5,800
+300
| +5% | +$8.3K |
|
|
MOMO
4505
Hello Group
MOMO
$695M
| $234K | ﹤0.01% |
40,362
+6,722
| +20% | +$40.1K |
|
4506
CALL
Cadiz
CDZI
$301M
| $234K | ﹤0.01% |
56,000
+44,600
| +391% | +$199K |
|
4507
CALL
Genesis Energy
GEL
$1.68B
| $234K | ﹤0.01% |
16,500
| – | – |
|
4508
PUT
Douglas Emmett
DEI
$1.61B
| $234K | ﹤0.01% |
19,800
+19,700
| +19,700% | +$222K |
|
4509
PUT
Columbia Financial
CLBK
$2.92B
| $233K | ﹤0.01% |
24,200
+19,140
| +378% | +$169K |
|
4510
PUT
Donaldson
DCI
$10.1B
| $233K | ﹤0.01% |
2,600
-3,600
| -58% | -$310K |
|
4511
ADMA Biologics
ADMA
$2.25B
| $233K | ﹤0.01% |
27,876
-27,041
| -49% | -$247K |
|
|
AUGO
4512
Aura Minerals Inc
AUGO
$6.67B
| $233K | ﹤0.01% |
3,705
-814
| -18% | -$64.1K |
|
|
FIRY
4513
CALL
Firy Inc
FIRY
$209M
| $233K | ﹤0.01% |
22,900
+22,000
| +2,444% | +$153K |
|
4514
PUT
Williams-Sonoma
WSM
$27.1B
| $233K | ﹤0.01% |
1,000
-8,700
| -90% | -$1.72M |
|
4515
PUT
Avalo Therapeutics
AVTX
$829M
| $233K | ﹤0.01% |
12,600
+6,900
| +121% | +$109K |
|
4516
PUT
Atlas Lithium Corp
ATLX
$72.2M
| $233K | ﹤0.01% |
63,100
-119,000
| -65% | -$531K |
|
4517
Avnet
AVT
$8.45B
| $233K | ﹤0.01% |
+2,620
| New | +$214K |
|
4518
PUT
Hyatt Hotels
H
$15.3B
| $233K | ﹤0.01% |
1,200
+1,000
| +500% | +$175K |
|
4519
PUT
Encompass Health
EHC
$12.2B
| $232K | ﹤0.01% |
2,300
+1,900
| +475% | +$197K |
|
4520
PUT
Arcosa
ACA
$7.17B
| $232K | ﹤0.01% |
1,600
+1,300
| +433% | +$161K |
|
4521
CALL
Vir Biotechnology
VIR
$1.82B
| $232K | ﹤0.01% |
22,800
-65,800
| -74% | -$626K |
|
4522
CALL
IQVIA
IQV
$44.4B
| $232K | ﹤0.01% |
1,200
-2,600
| -68% | -$453K |
|
4523
PUT
Sempra
SRE
$51.1B
| $232K | ﹤0.01% |
2,500
-13,500
| -84% | -$1.26M |
|
4524
CALL
Sonos
SONO
$2.11B
| $231K | ﹤0.01% |
17,100
-5,900
| -26% | -$86.3K |
|
4525
PUT
Nexa Resources
NEXA
$1.64B
| $231K | ﹤0.01% |
18,900
+7,100
| +60% | +$98.9K |
|
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.