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 | |
|---|---|---|---|---|---|---|
2776
CALL
Option Care Health
OPCH
$3.4B
| $1.4M | ﹤0.01% |
41,600
+38,200
| +1,124% | +$1.24M |
|
|
JNPR
2777
DELISTED
Juniper Networks
JNPR
| $1.39M | ﹤0.01% |
+37,611
| New | +$1.37M |
|
2778
Casey's General Stores
CASY
$31.9B
| $1.39M | ﹤0.01% |
4,373
+3,345
| +325% | +$977K |
|
2779
CALL
Eos Energy Enterprises
EOSE
$1.23B
| $1.39M | ﹤0.01% |
1,352,400
-668,200
| -33% | -$679K |
|
2780
PUT
Paylocity
PCTY
$6.71B
| $1.39M | ﹤0.01% |
8,100
-8,600
| -51% | -$1.42M |
|
2781
PUT
Toro Company
TTC
$8.93B
| $1.39M | ﹤0.01% |
15,200
+10,000
| +192% | +$922K |
|
2782
CALL
Progress Software
PRGS
$1.55B
| $1.39M | ﹤0.01% |
26,100
+25,600
| +5,120% | +$1.41M |
|
|
LUCK
2783
CALL
Lucky Strike Entertainment
LUCK
$938M
| $1.39M | ﹤0.01% |
101,400
+4,100
| +4% | +$52.9K |
|
2784
CALL
Sanmina
SANM
$11.2B
| $1.39M | ﹤0.01% |
+22,300
| New | +$1.3M |
|
2785
argenx
ARGX
$57.4B
| $1.39M | ﹤0.01% |
3,520
-926
| -21% | -$359K |
|
|
2786
PUT
Option Care Health
OPCH
$3.4B
| $1.39M | ﹤0.01% |
41,300
+38,200
| +1,232% | +$1.24M |
|
2787
CALL
EPAM Systems
EPAM
$4.69B
| $1.38M | ﹤0.01% |
5,000
-23,300
| -82% | -$6.86M |
|
2788
PUT
Crane Co
CR
$13.1B
| $1.38M | ﹤0.01% |
+10,200
| New | +$1.26M |
|
2789
PUT
NCR Atleos
NATL
$3.52B
| $1.38M | ﹤0.01% |
69,800
+69,500
| +23,167% | +$1.49M |
|
2790
CALL
Agilon Health
AGL
$1.64B
| $1.38M | ﹤0.01% |
9,028
+4,084
| +83% | +$680K |
|
2791
PUT
Addus HomeCare
ADUS
$2.14B
| $1.37M | ﹤0.01% |
13,300
+9,800
| +280% | +$916K |
|
2792
PUT
EyePoint Inc
EYPT
$1.02B
| $1.37M | ﹤0.01% |
66,300
-70,600
| -52% | -$1.75M |
|
2793
CALL
Fiverr
FVRR
$376M
| $1.37M | ﹤0.01% |
65,000
-4,100
| -6% | -$103K |
|
2794
PUT
Lennox International
LII
$18.8B
| $1.37M | ﹤0.01% |
2,800
+2,000
| +250% | +$910K |
|
2795
CALL
Applied Optoelectronics
AAOI
$8.04B
| $1.37M | ﹤0.01% |
98,700
-18,900
| -16% | -$319K |
|
|
ZIMV
2796
PUT
DELISTED
ZimVie
ZIMV
| $1.36M | ﹤0.01% |
82,800
-295,000
| -78% | -$5.26M |
|
2797
Establishment Labs
ESTA
$2.72B
| $1.36M | ﹤0.01% |
+26,771
| New | +$1.07M |
|
2798
CALL
Perion Network
PERI
$367M
| $1.36M | ﹤0.01% |
60,600
-500
| -0.8% | -$12.7K |
|
|
ATXS
2799
DELISTED
Astria Therapeutics
ATXS
| $1.36M | ﹤0.01% |
96,681
+81,001
| +517% | +$1.01M |
|
2800
Zimmer Biomet
ZBH
$17.7B
| $1.36M | ﹤0.01% |
+10,290
| New | +$1.29M |
|
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.