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 | |
|---|---|---|---|---|---|---|
4726
Lakeland Industries
LAKE
$108M
| $144K | ﹤0.01% |
9,897
-2,362
| -19% | -$34.6K |
|
|
NOTV
4727
CALL
DELISTED
Inotiv
NOTV
| $144K | ﹤0.01% |
33,300
+800
| +2% | +$5.09K |
|
|
STR
4728
PUT
DELISTED
Sitio Royalties
STR
| $144K | ﹤0.01% |
6,400
+2,400
| +60% | +$59.6K |
|
4729
Tecnoglass
TGLS
$1.99B
| $144K | ﹤0.01% |
3,441
+1,374
| +66% | +$49.2K |
|
4730
PUT
BioVie
BIVI
$9.5M
| $143K | ﹤0.01% |
+177
| New | +$117K |
|
4731
iShares MSCI Chile ETF
ECH
$1,000M
| $143K | ﹤0.01% |
4,976
-7,618
| -60% | -$215K |
|
4732
CALL
Granite Construction
GVA
$5.16B
| $143K | ﹤0.01% |
3,500
+2,700
| +338% | +$110K |
|
4733
Radware
RDWR
$983M
| $143K | ﹤0.01% |
6,650
-33,049
| -83% | -$691K |
|
4734
CALL
Affiliated Managers Group
AMG
$9.51B
| $142K | ﹤0.01% |
1,000
| – | – |
|
4735
Hudbay
HBM
$9.76B
| $142K | ﹤0.01% |
27,142
-37,282
| -58% | -$196K |
|
4736
PUT
ImmunityBio
IBRX
$7.15B
| $142K | ﹤0.01% |
78,300
+58,900
| +304% | +$183K |
|
4737
CALL
LivePerson
LPSN
$22M
| $142K | ﹤0.01% |
2,153
+1,813
| +533% | +$291K |
|
4738
CALL
Mercury Insurance
MCY
$6B
| $142K | ﹤0.01% |
4,500
+4,400
| +4,400% | +$150K |
|
|
PRO
4739
CALL
DELISTED
PROS Holdings
PRO
| $142K | ﹤0.01% |
5,200
+5,000
| +2,500% | +$130K |
|
|
SEE
4740
CALL
DELISTED
Sealed Air
SEE
| $142K | ﹤0.01% |
3,100
-5,300
| -63% | -$263K |
|
4741
Sundial Growers
SNDL
$312M
| $142K | ﹤0.01% |
89,084
-40,083
| -31% | -$78.6K |
|
4742
ProShares UltraPro Russell2000
URTY
$314M
| $142K | ﹤0.01% |
+3,773
| New | +$163K |
|
4743
CALL
Wabash National
WNC
$504M
| $142K | ﹤0.01% |
+5,800
| New | +$151K |
|
4744
Warby Parker
WRBY
$3.19B
| $142K | ﹤0.01% |
13,476
-21,727
| -62% | -$298K |
|
|
GOGL
4745
PUT
DELISTED
Golden Ocean Group
GOGL
| $141K | ﹤0.01% |
14,900
-71,800
| -83% | -$679K |
|
4746
PUT
Immunic
IMUX
$178M
| $141K | ﹤0.01% |
9,520
+6,360
| +201% | +$118K |
|
|
KNDI
4747
CALL
Kandi Technologies Group
KNDI
$66.5M
| $141K | ﹤0.01% |
51,200
-203,700
| -80% | -$516K |
|
4748
PUT
LegalZoom.com
LZ
$1.45B
| $141K | ﹤0.01% |
15,100
-57,300
| -79% | -$485K |
|
4749
Redwire
RDW
$1.86B
| $141K | ﹤0.01% |
46,719
+35,995
| +336% | +$106K |
|
|
RNAM
4750
DELISTED
Avidity Biosciences
RNAM
| $141K | ﹤0.01% |
9,247
+7,941
| +608% | +$175K |
|
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.