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 | |
|---|---|---|---|---|---|---|
4826
Tower Semiconductor
TSEM
$21.2B
| $133K | ﹤0.01% |
+3,145
| New | +$131K |
|
|
PGTI
4827
CALL
DELISTED
PGT, Inc.
PGTI
| $133K | ﹤0.01% |
5,300
+3,800
| +253% | +$80.6K |
|
|
PGTI
4828
PUT
DELISTED
PGT, Inc.
PGTI
| $133K | ﹤0.01% |
5,300
+1,700
| +47% | +$36K |
|
|
HEP
4829
CALL
DELISTED
Holly Energy Partners, L.P.
HEP
| $133K | ﹤0.01% |
7,700
-40,800
| -84% | -$751K |
|
4830
PUT
Vanguard Total Bond Market
BND
$158B
| $132K | ﹤0.01% |
1,800
-6,700
| -79% | -$490K |
|
4831
Customers Bancorp
CUBI
$2.66B
| $132K | ﹤0.01% |
+7,153
| New | +$195K |
|
4832
ProShares UltraShort Energy
DUG
$21.2M
| $132K | ﹤0.01% |
2,543
+62
| +2% | +$3.18K |
|
|
HUYA
4833
Huya Inc
HUYA
$558M
| $132K | ﹤0.01% |
36,817
-49,305
| -57% | -$232K |
|
4834
PUT
MGIC Investment
MTG
$6.47B
| $132K | ﹤0.01% |
9,900
-1,800
| -15% | -$24.2K |
|
4835
CALL
Perella Weinberg Partners
PWP
$1.08B
| $132K | ﹤0.01% |
14,600
-2,500
| -15% | -$25K |
|
4836
CALL
Avita Medical
RCEL
$137M
| $132K | ﹤0.01% |
9,500
+7,200
| +313% | +$76.6K |
|
4837
PUT
Reinsurance Group of America
RGA
$15.5B
| $132K | ﹤0.01% |
1,000
-2,600
| -72% | -$368K |
|
4838
Yext
YEXT
$573M
| $132K | ﹤0.01% |
13,801
+7,522
| +120% | +$57.9K |
|
|
PWSC
4839
PUT
DELISTED
PowerSchool Holdings, Inc.
PWSC
| $132K | ﹤0.01% |
6,700
+6,600
| +6,600% | +$144K |
|
4840
AirSculpt Technologies
AIRS
$307M
| $131K | ﹤0.01% |
+26,178
| New | +$145K |
|
|
BZUN
4841
PUT
Baozun
BZUN
$179M
| $131K | ﹤0.01% |
21,900
+9,100
| +71% | +$60K |
|
4842
PUT
Denison Mines
DNN
$2.43B
| $131K | ﹤0.01% |
120,700
-23,400
| -16% | -$28.9K |
|
4843
CALL
Fresenius Medical Care
FMS
$13.4B
| $131K | ﹤0.01% |
6,200
-3,000
| -33% | -$57.4K |
|
4844
CALL
Kinetik
KNTK
$3.72B
| $131K | ﹤0.01% |
+4,200
| New | +$129K |
|
4845
CALL
ResMed
RMD
$31.1B
| $131K | ﹤0.01% |
600
-800
| -57% | -$174K |
|
4846
CALL
Sensus Healthcare
SRTS
$46.9M
| $131K | ﹤0.01% |
25,200
-15,300
| -38% | -$110K |
|
4847
CALL
Simpson Manufacturing
SSD
$7.79B
| $131K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$115K |
|
|
GAZ
4848
DELISTED
iPath Series B Bloomberg Natural Gas Total Return Sub-Index ETN
GAZ
| $131K | ﹤0.01% |
12,066
+11,984
| +14,615% | +$172K |
|
4849
PUT
AudioEye
AEYE
$71.5M
| $130K | ﹤0.01% |
18,400
+16,900
| +1,127% | +$96.2K |
|
4850
PUT
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $130K | ﹤0.01% |
3,600
-1,200
| -25% | -$73.3K |
|
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.