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 | |
|---|---|---|---|---|---|---|
2901
Axsome Therapeutics
AXSM
$12.3B
| $1.23M | ﹤0.01% |
15,386
-5,427
| -26% | -$456K |
|
2902
CALL
Advanced Energy
AEIS
$11.7B
| $1.22M | ﹤0.01% |
12,000
+11,000
| +1,100% | +$1.12M |
|
2903
CALL
Lazard
LAZ
$4.23B
| $1.22M | ﹤0.01% |
29,200
-4,800
| -14% | -$187K |
|
2904
CALL
Ligand Pharmaceuticals
LGND
$5.95B
| $1.22M | ﹤0.01% |
16,700
+1,200
| +8% | +$88.5K |
|
2905
PUT
Transmedics
TMDX
$2.57B
| $1.22M | ﹤0.01% |
16,500
+13,600
| +469% | +$1.12M |
|
2906
Bloom Energy
BE
$53.5B
| $1.22M | ﹤0.01% |
108,495
+61,498
| +131% | +$676K |
|
2907
CALL
Amneal Pharmaceuticals
AMRX
$5.78B
| $1.22M | ﹤0.01% |
201,100
-7,400
| -4% | -$41.7K |
|
2908
PUT
Hecla Mining
HL
$10.2B
| $1.22M | ﹤0.01% |
252,700
+129,800
| +106% | +$518K |
|
2909
PUT
Birkenstock
BIRK
$7.64B
| $1.21M | ﹤0.01% |
25,700
-13,600
| -35% | -$649K |
|
|
JKS
2910
CALL
JinkoSolar
JKS
$799M
| $1.21M | ﹤0.01% |
48,200
+7,100
| +17% | +$195K |
|
2911
PUT
VICI Properties
VICI
$29.5B
| $1.21M | ﹤0.01% |
40,700
+15,200
| +60% | +$456K |
|
2912
CALL
Bio-Rad Laboratories Class A
BIO
$8.47B
| $1.21M | ﹤0.01% |
3,500
-700
| -17% | -$230K |
|
2913
CALL
MKS Inc
MKSI
$21.3B
| $1.21M | ﹤0.01% |
9,100
-4,400
| -33% | -$511K |
|
2914
PUT
Flex
FLEX
$42.5B
| $1.21M | ﹤0.01% |
46,300
+30,907
| +201% | +$811K |
|
2915
PUT
NexGen Energy
NXE
$6.17B
| $1.21M | ﹤0.01% |
155,600
+27,500
| +21% | +$204K |
|
2916
PUT
PTC
PTC
$14.5B
| $1.21M | ﹤0.01% |
6,400
-14,200
| -69% | -$2.56M |
|
2917
CALL
Establishment Labs
ESTA
$2.71B
| $1.21M | ﹤0.01% |
23,700
-28,600
| -55% | -$1.15M |
|
2918
CALL
Flowserve
FLS
$9.29B
| $1.21M | ﹤0.01% |
26,400
-1,500
| -5% | -$63.2K |
|
2919
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$868M
| $1.2M | ﹤0.01% |
22,200
+4,100
| +23% | +$191K |
|
2920
PUT
Texas Roadhouse
TXRH
$13.2B
| $1.2M | ﹤0.01% |
7,800
-48,000
| -86% | -$6.58M |
|
2921
PUT
HF Sinclair
DINO
$16.4B
| $1.2M | ﹤0.01% |
19,900
-34,500
| -63% | -$1.96M |
|
2922
PUT
Genco Shipping & Trading
GNK
$1.1B
| $1.2M | ﹤0.01% |
59,100
-17,000
| -22% | -$314K |
|
2923
PUT
Forward Air
FWRD
$466M
| $1.2M | ﹤0.01% |
38,600
+36,500
| +1,738% | +$1.53M |
|
2924
PUT
Fluence Energy
FLNC
$1.8B
| $1.2M | ﹤0.01% |
69,200
-3,900
| -5% | -$71.3K |
|
|
GTLS
2925
DELISTED
Chart Industries
GTLS
| $1.2M | ﹤0.01% |
+7,277
| New | +$977K |
|
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.