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 | |
|---|---|---|---|---|---|---|
2851
PUT
Boot Barn
BOOT
$4.67B
| $1.29M | ﹤0.01% |
13,600
+9,700
| +249% | +$802K |
|
2852
CALL
Ericsson
ERIC
$31.6B
| $1.29M | ﹤0.01% |
234,700
+78,600
| +50% | +$443K |
|
2853
CALL
Travel + Leisure Co
TNL
$4.63B
| $1.29M | ﹤0.01% |
26,400
+22,900
| +654% | +$978K |
|
|
DFTX
2854
CALL
Definium Therapeutics
DFTX
$5.68B
| $1.29M | ﹤0.01% |
137,400
-186,000
| -58% | -$1.06M |
|
2855
PUT
MSCI
MSCI
$41.1B
| $1.29M | ﹤0.01% |
2,300
-13,600
| -86% | -$7.65M |
|
2856
CALL
HUB Group
HUBG
$2.93B
| $1.29M | ﹤0.01% |
29,800
-34,200
| -53% | -$1.5M |
|
2857
CALL
Owens Corning
OC
$11.5B
| $1.28M | ﹤0.01% |
7,700
-200
| -3% | -$30.5K |
|
2858
NRG Energy
NRG
$29.2B
| $1.28M | ﹤0.01% |
+18,943
| New | +$1.06M |
|
2859
CALL
LKQ Corp
LKQ
$6.69B
| $1.28M | ﹤0.01% |
24,000
+6,100
| +34% | +$303K |
|
2860
CALL
MDU Resources
MDU
$4.38B
| $1.28M | ﹤0.01% |
91,694
+91,333
| +25,300% | +$1.06M |
|
2861
PUT
Costamare
CMRE
$1.9B
| $1.28M | ﹤0.01% |
112,700
-428,800
| -79% | -$4.75M |
|
2862
Petrobras
PBR
$117B
| $1.28M | ﹤0.01% |
+84,118
| New | +$1.37M |
|
2863
CALL
Ultragenyx Pharmaceutical
RARE
$2.68B
| $1.28M | ﹤0.01% |
27,400
+4,600
| +20% | +$217K |
|
2864
Payoneer
PAYO
$2.41B
| $1.28M | ﹤0.01% |
263,148
+250,940
| +2,056% | +$1.22M |
|
|
CTLT
2865
CALL
DELISTED
CATALENT, INC.
CTLT
| $1.27M | ﹤0.01% |
22,600
-29,500
| -57% | -$1.6M |
|
2866
CALL
Snap-on
SNA
$21B
| $1.27M | ﹤0.01% |
4,300
-6,600
| -61% | -$1.87M |
|
2867
Southwest Airlines
LUV
$22.3B
| $1.27M | ﹤0.01% |
+43,521
| New | +$1.35M |
|
|
CRON
2868
CALL
Cronos Group
CRON
$1.07B
| $1.27M | ﹤0.01% |
485,100
+411,900
| +563% | +$883K |
|
2869
PBF Energy
PBF
$7.25B
| $1.26M | ﹤0.01% |
21,976
-82,679
| -79% | -$4.05M |
|
2870
PUT
Sprout Social
SPT
$505M
| $1.26M | ﹤0.01% |
21,200
+200
| +1% | +$12.2K |
|
|
FLNA
2871
CALL
Filana Therapeutics
FLNA
$44.1M
| $1.26M | ﹤0.01% |
91,500
-70,700
| -44% | -$1.63M |
|
|
WIRE
2872
PUT
DELISTED
Encore Wire Corp
WIRE
| $1.26M | ﹤0.01% |
4,800
+2,600
| +118% | +$590K |
|
2873
CALL
Gran Tierra Energy
GTE
$240M
| $1.26M | ﹤0.01% |
176,600
-352,500
| -67% | -$1.96M |
|
2874
CALL
Magna International
MGA
$18B
| $1.26M | ﹤0.01% |
23,100
-32,100
| -58% | -$1.77M |
|
2875
CALL
Arch Capital
ACGL
$36.3B
| $1.26M | ﹤0.01% |
13,600
+10,500
| +339% | +$888K |
|
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.