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 | |
|---|---|---|---|---|---|---|
2776
PUT
SandRidge Energy
SD
$510M
| $817K | ﹤0.01% |
56,700
-12,800
| -18% | -$196K |
|
2777
CALL
First Horizon
FHN
$12.1B
| $816K | ﹤0.01% |
45,900
+27,800
| +154% | +$618K |
|
2778
CALL
Gulfport Energy Corp
GPOR
$2.83B
| $816K | ﹤0.01% |
+10,200
| New | +$739K |
|
2779
UBS Group
UBS
$170B
| $815K | ﹤0.01% |
+38,202
| New | +$797K |
|
|
MRSN
2780
CALL
DELISTED
Mersana Therapeutics
MRSN
| $814K | ﹤0.01% |
7,928
+7,908
| +39,540% | +$1.11M |
|
2781
PUT
Canadian National Railway
CNI
$78.3B
| $813K | ﹤0.01% |
6,900
-22,800
| -77% | -$2.69M |
|
|
VRE
2782
PUT
DELISTED
Veris Residential
VRE
| $812K | ﹤0.01% |
55,500
+55,200
| +18,400% | +$880K |
|
2783
CALL
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $811K | ﹤0.01% |
18,000
+16,500
| +1,100% | +$770K |
|
2784
PUT
Old National Bancorp
ONB
$10.1B
| $811K | ﹤0.01% |
56,300
+47,700
| +555% | +$808K |
|
2785
PUT
Gaotu Techedu
GOTU
$372M
| $810K | ﹤0.01% |
192,100
-439,300
| -70% | -$1.71M |
|
2786
CALL
indie Semiconductor
INDI
$733M
| $810K | ﹤0.01% |
76,800
-97,800
| -56% | -$874K |
|
2787
CALL
Companhia Siderúrgica Nacional
SID
$1.43B
| $810K | ﹤0.01% |
264,000
+49,000
| +23% | +$158K |
|
2788
CALL
Alpha and Omega Semiconductor
AOSL
$923M
| $808K | ﹤0.01% |
30,000
+27,200
| +971% | +$790K |
|
2789
Flowserve
FLS
$9.25B
| $807K | ﹤0.01% |
+23,764
| New | +$796K |
|
|
UNVR
2790
DELISTED
Univar Solutions Inc.
UNVR
| $804K | ﹤0.01% |
+22,960
| New | +$779K |
|
|
MACK
2791
CALL
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $804K | ﹤0.01% |
65,500
+30,900
| +89% | +$363K |
|
|
AKRO
2792
CALL
DELISTED
Akero Therapeutics
AKRO
| $803K | ﹤0.01% |
21,000
-2,900
| -12% | -$129K |
|
2793
Ecolab
ECL
$75.6B
| $802K | ﹤0.01% |
4,850
+1,268
| +35% | +$198K |
|
2794
PUT
Ferguson
FERG
$44.7B
| $802K | ﹤0.01% |
6,000
-2,100
| -26% | -$292K |
|
2795
CALL
Theravance Biopharma
TBPH
$874M
| $802K | ﹤0.01% |
74,000
-44,700
| -38% | -$473K |
|
2796
CALL
ACV Auctions
ACVA
$1.35B
| $801K | ﹤0.01% |
62,100
+60,900
| +5,075% | +$666K |
|
2797
PUT
TG Therapeutics
TGTX
$8.58B
| $801K | ﹤0.01% |
53,300
-249,200
| -82% | -$3.79M |
|
2798
PUT
Life Time Group Holdings
LTH
$9.42B
| $799K | ﹤0.01% |
50,100
-52,900
| -51% | -$907K |
|
2799
CALL
Rocket Lab Corp
RKLB
$39.9B
| $799K | ﹤0.01% |
198,000
+4,500
| +2% | +$20.2K |
|
2800
PUT
Equinor
EQNR
$95.9B
| $798K | ﹤0.01% |
28,100
+21,400
| +319% | +$646K |
|
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.