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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2626
CALL
Pliant Therapeutics
PLRX
$67.5M
| $960K | ﹤0.01% |
36,100
-700
| -2% | -$19.9K |
|
|
CHGX
2627
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $960K | ﹤0.01% |
29,200
-16,200
| -36% | -$458K |
|
2628
PUT
Bloomin' Brands
BLMN
$680M
| $959K | ﹤0.01% |
37,400
+10,000
| +36% | +$248K |
|
2629
Tidewater
TDW
$3.91B
| $959K | ﹤0.01% |
21,778
+20,886
| +2,341% | +$898K |
|
2630
PUT
Comstock Resources
CRK
$3.97B
| $958K | ﹤0.01% |
88,800
-14,000
| -14% | -$166K |
|
2631
Lyft
LYFT
$5.39B
| $957K | ﹤0.01% |
103,314
+33,556
| +48% | +$405K |
|
|
SJT
2632
CALL
San Juan Basin Royalty Trust
SJT
$117M
| $957K | ﹤0.01% |
91,000
+26,500
| +41% | +$275K |
|
|
CPE
2633
DELISTED
Callon Petroleum Company
CPE
| $957K | ﹤0.01% |
28,632
+26,633
| +1,332% | +$1M |
|
|
EWCZ
2634
CALL
DELISTED
European Wax Center
EWCZ
| $955K | ﹤0.01% |
+50,300
| New | +$881K |
|
2635
Array Technologies
ARRY
$818M
| $954K | ﹤0.01% |
+43,611
| New | +$892K |
|
|
TEN
2636
PUT
Tsakos Energy Navigation Ltd
TEN
$1.19B
| $954K | ﹤0.01% |
49,100
+24,300
| +98% | +$475K |
|
2637
CALL
Coursera
COUR
$1.54B
| $953K | ﹤0.01% |
82,800
+25,100
| +44% | +$325K |
|
2638
CALL
ARS Pharmaceuticals
SPRY
$590M
| $952K | ﹤0.01% |
146,300
+20,300
| +16% | +$156K |
|
2639
PUT
Coty
COTY
$2.33B
| $951K | ﹤0.01% |
78,900
-90,000
| -53% | -$952K |
|
2640
PUT
Allegro MicroSystems
ALGM
$8.58B
| $950K | ﹤0.01% |
19,800
+12,800
| +183% | +$521K |
|
2641
PUT
Invesco Mortgage Capital
IVR
$776M
| $949K | ﹤0.01% |
85,600
-15,700
| -15% | -$202K |
|
2642
Manitowoc
MTW
$516M
| $949K | ﹤0.01% |
55,552
+13,619
| +32% | +$204K |
|
|
DVAX
2643
CALL
DELISTED
Dynavax Technologies
DVAX
| $948K | ﹤0.01% |
96,700
-56,900
| -37% | -$607K |
|
2644
Hecla Mining
HL
$10.2B
| $947K | ﹤0.01% |
149,739
-67,386
| -31% | -$387K |
|
2645
CALL
Republic Services
RSG
$66.7B
| $946K | ﹤0.01% |
7,000
-100
| -1% | -$12.8K |
|
2646
PUT
Dycom Industries
DY
$12.9B
| $945K | ﹤0.01% |
10,100
-100
| -1% | -$9.29K |
|
2647
PUT
Children's Place
PLCE
$53.6M
| $945K | ﹤0.01% |
23,500
| – | – |
|
2648
PUT
Sundial Growers
SNDL
$325M
| $945K | ﹤0.01% |
590,800
-260,600
| -31% | -$511K |
|
|
SI
2649
CALL
DELISTED
Silvergate Capital Corporation
SI
| $944K | ﹤0.01% |
583,200
-122,400
| -17% | -$1.33M |
|
|
HIBB
2650
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $944K | ﹤0.01% |
16,020
+11,481
| +253% | +$771K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.