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 | |
|---|---|---|---|---|---|---|
5776
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.47B
| $57K | ﹤0.01% |
6,700
-12,000
| -64% | -$105K |
|
5777
PUT
Liberty Energy
LBRT
$3.05B
| $57K | ﹤0.01% |
4,500
+1,700
| +61% | +$25.1K |
|
5778
PUT
Mativ Holdings
MATV
$481M
| $57K | ﹤0.01% |
2,700
-10,900
| -80% | -$269K |
|
5779
PUT
Ramaco Resources Class A
METC
$599M
| $57K | ﹤0.01% |
6,718
-19,225
| -74% | -$180K |
|
5780
CALL
NETGEAR
NTGR
$648M
| $57K | ﹤0.01% |
3,100
+2,400
| +343% | +$45K |
|
5781
PUT
PAR Technology
PAR
$699M
| $57K | ﹤0.01% |
1,700
-400
| -19% | -$13.3K |
|
5782
PUT
Paymentus
PAY
$4.29B
| $57K | ﹤0.01% |
6,500
+3,800
| +141% | +$32.1K |
|
5783
Rocket Pharmaceuticals
RCKT
$340M
| $57K | ﹤0.01% |
+3,385
| New | +$66.3K |
|
5784
CALL
Steris
STE
$22.3B
| $57K | ﹤0.01% |
+300
| New | +$58K |
|
5785
Turkcell
TKC
$4.68B
| $57K | ﹤0.01% |
13,333
+5,245
| +65% | +$24K |
|
5786
Thermo Fisher Scientific
TMO
$213B
| $57K | ﹤0.01% |
100
| – | – |
|
5787
CALL
UMB Financial
UMBF
$11.1B
| $57K | ﹤0.01% |
+1,000
| New | +$81.3K |
|
5788
Utz Brands
UTZ
$1.25B
| $57K | ﹤0.01% |
+3,466
| New | +$57.4K |
|
5789
CALL
GeneDx Holdings
WGS
$1.93B
| $57K | ﹤0.01% |
+4,809
| New | +$64.1K |
|
|
KEEL
5790
PUT
Keel Infrastructure Corp
KEEL
$2.4B
| $56K | ﹤0.01% |
57,800
+17,500
| +43% | +$16.4K |
|
5791
PUT
Vita Coco
COCO
$3.82B
| $56K | ﹤0.01% |
2,900
+100
| +4% | +$1.57K |
|
5792
iShares MSCI Australia ETF
EWA
$1.39B
| $56K | ﹤0.01% |
+2,479
| New | +$58K |
|
5793
CALL
Lakeland Financial Corp
LKFN
$1.56B
| $56K | ﹤0.01% |
+900
| New | +$62.8K |
|
5794
CALL
Marcus Corp
MCS
$897M
| $56K | ﹤0.01% |
3,500
-100
| -3% | -$1.53K |
|
5795
PUT
Medpace
MEDP
$16.1B
| $56K | ﹤0.01% |
300
-200
| -40% | -$41.4K |
|
5796
PUT
Sabre
SABR
$731M
| $56K | ﹤0.01% |
13,100
-418,100
| -97% | -$2.39M |
|
|
SEM
5797
CALL
DELISTED
Select Medical
SEM
| $56K | ﹤0.01% |
4,083
-6,311
| -61% | -$92.9K |
|
5798
SM Energy
SM
$7.8B
| $56K | ﹤0.01% |
+1,995
| New | +$60.9K |
|
5799
PUT
West Fraser Timber
WFG
$5.08B
| $56K | ﹤0.01% |
+800
| New | +$61.5K |
|
|
SLCA
5800
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $56K | ﹤0.01% |
+4,759
| New | +$56.6K |
|
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.