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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3626
OneSpan
OSPN
$572M
| $367K | ﹤0.01% |
+24,782
| New | +$386K |
|
|
NVEI
3627
CALL
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $366K | ﹤0.01% |
12,400
+3,000
| +32% | +$106K |
|
|
TRTN
3628
CALL
DELISTED
Triton International Limited
TRTN
| $366K | ﹤0.01% |
4,400
-18,500
| -81% | -$1.5M |
|
3629
PUT
Ameriprise Financial
AMP
$48.3B
| $365K | ﹤0.01% |
1,100
+900
| +450% | +$277K |
|
3630
Playtika
PLTK
$1.51B
| $365K | ﹤0.01% |
31,532
+19,585
| +164% | +$212K |
|
3631
Star Bulk Carriers
SBLK
$3.12B
| $365K | ﹤0.01% |
20,627
+1,844
| +10% | +$35.5K |
|
|
GGRP
3632
CALL
Glimpse Group
GGRP
$19.4M
| $365K | ﹤0.01% |
102,800
-11,600
| -10% | -$47.6K |
|
3633
CALL
Voyager Therapeutics
VYGR
$184M
| $365K | ﹤0.01% |
31,900
+2,200
| +7% | +$22.8K |
|
3634
PUT
Build-A-Bear
BBW
$443M
| $364K | ﹤0.01% |
17,000
+12,800
| +305% | +$280K |
|
|
ATSG
3635
PUT
DELISTED
Air Transport Services Group
ATSG
| $364K | ﹤0.01% |
19,300
+2,200
| +13% | +$40.9K |
|
|
ARCE
3636
CALL
DELISTED
Arco Platform Limited Class A Common Shares
ARCE
| $364K | ﹤0.01% |
+30,000
| New | +$356K |
|
|
GRFS
3637
CALL
Grifois
GRFS
$5.44B
| $363K | ﹤0.01% |
39,700
+700
| +2% | +$5.78K |
|
3638
CALL
Cytokinetics
CYTK
$10.8B
| $362K | ﹤0.01% |
11,100
+6,500
| +141% | +$240K |
|
|
AJRD
3639
PUT
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $362K | ﹤0.01% |
6,600
+6,400
| +3,200% | +$355K |
|
3640
PUT
Designer Brands
DBI
$322M
| $361K | ﹤0.01% |
35,800
+33,000
| +1,179% | +$272K |
|
3641
Okta
OKTA
$23.7B
| $361K | ﹤0.01% |
5,217
-30,825
| -86% | -$2.34M |
|
|
VTNR
3642
DELISTED
Vertex Energy, Inc
VTNR
| $361K | ﹤0.01% |
+57,891
| New | +$408K |
|
3643
Greif
GEF
$4.74B
| $360K | ﹤0.01% |
+5,230
| New | +$336K |
|
3644
CALL
LivaNova
LIVN
$4.51B
| $360K | ﹤0.01% |
7,000
+3,500
| +100% | +$164K |
|
3645
Sunoco
SUN
$14.4B
| $360K | ﹤0.01% |
8,277
+819
| +11% | +$36.3K |
|
3646
CALL
NCR Voyix
VYX
$1.19B
| $360K | ﹤0.01% |
23,309
+6,194
| +36% | +$89.4K |
|
|
RAPT
3647
CALL
DELISTED
RAPT Therapeutics
RAPT
| $359K | ﹤0.01% |
2,400
-63
| -3% | -$9.81K |
|
|
BKI
3648
DELISTED
Black Knight, Inc. Common Stock
BKI
| $359K | ﹤0.01% |
6,020
+5,920
| +5,920% | +$332K |
|
3649
PUT
Anavex Life Sciences
AVXL
$238M
| $358K | ﹤0.01% |
44,100
+8,600
| +24% | +$73.7K |
|
3650
CALL
Kymera Therapeutics
KYMR
$8.73B
| $358K | ﹤0.01% |
15,600
-91,300
| -85% | -$2.62M |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.