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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3876
CALL
International Seaways
INSW
$4.63B
| $494K | ﹤0.01% |
9,300
-25,200
| -73% | -$1.31M |
|
3877
State Street SPDR S&P Insurance ETF
KIE
$671M
| $494K | ﹤0.01% |
9,497
+3,191
| +51% | +$155K |
|
3878
PUT
Teucrium Agricultural Fund
TAGS
$19.3M
| $493K | ﹤0.01% |
44,900
-40,600
| -47% | -$1.15M |
|
3879
CALL
TransDigm Group
TDG
$73.2B
| $492K | ﹤0.01% |
400
-4,400
| -92% | -$4.95M |
|
3880
CALL
Upbound Group
UPBD
$1.26B
| $492K | ﹤0.01% |
14,000
+9,100
| +186% | +$304K |
|
3881
CALL
Genworth Financial
GNW
$3.85B
| $491K | ﹤0.01% |
76,500
+12,800
| +20% | +$80.1K |
|
3882
Iovance Biotherapeutics
IOVA
$2.1B
| $491K | ﹤0.01% |
33,195
-340,872
| -91% | -$3.97M |
|
3883
Moody's
MCO
$83.9B
| $490K | ﹤0.01% |
1,247
-365
| -23% | -$141K |
|
3884
PUT
Nokia
NOK
$49.9B
| $490K | ﹤0.01% |
138,600
+5,400
| +4% | +$19.2K |
|
3885
PUT
Bausch + Lomb
BLCO
$5.92B
| $489K | ﹤0.01% |
28,300
+20,000
| +241% | +$311K |
|
3886
CALL
EXL Service
EXLS
$4.66B
| $489K | ﹤0.01% |
15,400
+2,400
| +18% | +$74.7K |
|
|
AGNT
3887
PUT
AGNT Inc
AGNT
$661M
| $489K | ﹤0.01% |
47,400
-140,900
| -75% | -$1.73M |
|
3888
Aehr Test Systems
AEHR
$2.28B
| $488K | ﹤0.01% |
39,434
+1,695
| +4% | +$28.2K |
|
3889
CALL
Brookfield Infrastructure Partners
BIP
$19.3B
| $486K | ﹤0.01% |
15,600
+13,600
| +680% | +$413K |
|
3890
DXP Enterprises
DXPE
$2.49B
| $486K | ﹤0.01% |
+9,052
| New | +$340K |
|
3891
CALL
Polestar Automotive Holding UK
PSNY
$2.03B
| $486K | ﹤0.01% |
10,520
-3,237
| -24% | -$175K |
|
3892
CALL
Flowers Foods
FLO
$1.6B
| $484K | ﹤0.01% |
20,400
+13,100
| +179% | +$299K |
|
|
MASI
3893
CALL
DELISTED
Masimo
MASI
| $484K | ﹤0.01% |
3,300
-99,900
| -97% | -$12.9M |
|
3894
Invesco S&P 500 Low Volatility ETF
SPLV
$7.28B
| $484K | ﹤0.01% |
7,352
-33,173
| -82% | -$2.12M |
|
3895
PUT
BBVA Argentina
BBAR
$3.85B
| $483K | ﹤0.01% |
57,000
+15,700
| +38% | +$98.1K |
|
3896
CALL
Bakkt Inc
BKKT
$334M
| $483K | ﹤0.01% |
42,048
+25,176
| +149% | +$677K |
|
3897
Eagle Materials
EXP
$6.86B
| $483K | ﹤0.01% |
1,779
-4,524
| -72% | -$1.07M |
|
|
MESO
3898
CALL
Mesoblast
MESO
$1.87B
| $483K | ﹤0.01% |
96,500
+49,500
| +105% | +$105K |
|
3899
CALL
Principal Financial Group
PFG
$24.5B
| $483K | ﹤0.01% |
5,600
+1,400
| +33% | +$112K |
|
3900
CALL
Arcturus Therapeutics
ARCT
$163M
| $482K | ﹤0.01% |
14,300
-29,100
| -67% | -$1.03M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.