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 | |
|---|---|---|---|---|---|---|
3601
PUT
Nexstar Media Group
NXST
$5.92B
| $637K | ﹤0.01% |
3,700
-20,500
| -85% | -$3.44M |
|
3602
CALL
The Greenbrier Companies
GBX
$1.6B
| $635K | ﹤0.01% |
12,200
-8,000
| -40% | -$385K |
|
3603
Leggett & Platt
LEG
$1.47B
| $635K | ﹤0.01% |
33,210
+16,863
| +103% | +$367K |
|
3604
CALL
Roivant Sciences
ROIV
$24.3B
| $635K | ﹤0.01% |
60,300
-75,500
| -56% | -$814K |
|
|
SKX
3605
DELISTED
Skechers
SKX
| $635K | ﹤0.01% |
+10,379
| New | +$634K |
|
3606
Zai Lab
ZLAB
$2.1B
| $634K | ﹤0.01% |
39,627
+24,834
| +168% | +$523K |
|
3607
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $633K | ﹤0.01% |
15,000
-45,900
| -75% | -$1.67M |
|
3608
CALL
Rentokil
RTO
$14.5B
| $633K | ﹤0.01% |
21,000
+20,900
| +20,900% | +$580K |
|
3609
Community Health Systems
CYH
$393M
| $632K | ﹤0.01% |
180,625
+26,794
| +17% | +$90.6K |
|
3610
PUT
Twist Bioscience
TWST
$5.51B
| $631K | ﹤0.01% |
18,400
-48,200
| -72% | -$1.74M |
|
3611
CALL
Porch Group
PRCH
$1.38B
| $630K | ﹤0.01% |
146,200
+88,800
| +155% | +$265K |
|
3612
PUT
Parsons
PSN
$6.64B
| $630K | ﹤0.01% |
7,600
-18,300
| -71% | -$1.33M |
|
3613
Resideo Technologies
REZI
$5.55B
| $630K | ﹤0.01% |
28,126
+15,829
| +129% | +$313K |
|
|
CAN
3614
Canaan Creative
CAN
$178M
| $629K | ﹤0.01% |
+414,237
| New | +$702K |
|
3615
PUT
Vanguard S&P 500 Growth ETF
VOOG
$25.2B
| $627K | ﹤0.01% |
+12,600
| New | +$608K |
|
3616
CALL
Arcus Biosciences
RCUS
$3.4B
| $626K | ﹤0.01% |
33,200
+6,700
| +25% | +$116K |
|
3617
CALL
AMN Healthcare
AMN
$1.35B
| $625K | ﹤0.01% |
10,000
+8,400
| +525% | +$571K |
|
3618
Celestica
CLS
$40.3B
| $623K | ﹤0.01% |
+13,864
| New | +$526K |
|
3619
Madison Square Garden
MSGS
$9.58B
| $623K | ﹤0.01% |
+3,379
| New | +$628K |
|
|
LSXMA
3620
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $622K | ﹤0.01% |
20,943
-4,726
| -18% | -$142K |
|
3621
PUT
Ametek
AME
$55.3B
| $621K | ﹤0.01% |
3,400
-7,900
| -70% | -$1.36M |
|
3622
PUT
AdvanSix
ASIX
$551M
| $620K | ﹤0.01% |
21,700
+19,900
| +1,106% | +$532K |
|
3623
CALL
VistaGen Therapeutics
VTGN
$9.55M
| $620K | ﹤0.01% |
117,600
+74,700
| +174% | +$359K |
|
|
GTHX
3624
CALL
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $618K | ﹤0.01% |
143,100
+62,600
| +78% | +$218K |
|
3625
PUT
C4 Therapeutics
CCCC
$393M
| $617K | ﹤0.01% |
75,600
-141,600
| -65% | -$1.1M |
|
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.