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 | |
|---|---|---|---|---|---|---|
926
PUT
Pool Corp
POOL
$6.68B
| $13.8M | 0.01% |
34,300
+12,300
| +56% | +$4.81M |
|
927
CALL
Royal Gold
RGLD
$16.9B
| $13.8M | 0.01% |
113,000
+46,900
| +71% | +$5.3M |
|
928
PUT
BILL Holdings
BILL
$4.11B
| $13.7M | 0.01% |
199,800
-115,300
| -37% | -$8.06M |
|
929
PUT
SentinelOne
S
$5.96B
| $13.7M | 0.01% |
586,500
+262,400
| +81% | +$6.86M |
|
930
CALL
Burlington
BURL
$21.4B
| $13.7M | 0.01% |
58,800
-114,300
| -66% | -$23.3M |
|
931
PUT
NXP Semiconductors
NXPI
$70B
| $13.7M | 0.01% |
55,100
-91,600
| -62% | -$21.2M |
|
932
CALL
Mobileye
MBLY
$6.29B
| $13.6M | 0.01% |
421,800
+339,600
| +413% | +$9.64M |
|
933
CALL
Kenvue
KVUE
$36.3B
| $13.5M | 0.01% |
630,900
-2,372,600
| -79% | -$48.2M |
|
934
CALL
GameStop
GME
$9.58B
| $13.5M | 0.01% |
1,081,100
-161,700
| -13% | -$2.34M |
|
935
CALL
Celestica
CLS
$38.5B
| $13.5M | 0.01% |
299,700
+100,100
| +50% | +$3.8M |
|
936
C3.ai
AI
$1.27B
| $13.5M | 0.01% |
497,130
+444,594
| +846% | +$12.5M |
|
937
CALL
Stryker
SYK
$122B
| $13.5M | 0.01% |
37,600
-11,300
| -23% | -$3.8M |
|
938
CALL
Vale
VALE
$63.1B
| $13.4M | 0.01% |
1,102,000
-37,500
| -3% | -$506K |
|
939
PUT
The Mosaic Company
MOS
$7.08B
| $13.4M | 0.01% |
413,700
-45,000
| -10% | -$1.43M |
|
|
WBA
940
DELISTED
Walgreens Boots Alliance
WBA
| $13.4M | 0.01% |
618,631
+431,256
| +230% | +$9.58M |
|
941
CALL
Paychex
PAYX
$39.4B
| $13.4M | 0.01% |
109,200
+61,000
| +127% | +$7.4M |
|
942
PUT
Sony
SONY
$122B
| $13.4M | 0.01% |
779,500
+163,500
| +27% | +$3.01M |
|
943
CALL
Iovance Biotherapeutics
IOVA
$2.29B
| $13.4M | 0.01% |
901,000
+272,800
| +43% | +$3.18M |
|
944
PUT
Axos Financial
AX
$5.42B
| $13.3M | 0.01% |
246,900
-51,300
| -17% | -$2.7M |
|
945
CALL
Exelon
EXC
$48.4B
| $13.3M | 0.01% |
354,800
-27,800
| -7% | -$993K |
|
946
PUT
BHP
BHP
$212B
| $13.3M | 0.01% |
230,900
-205,100
| -47% | -$12.3M |
|
947
CALL
McKesson
MCK
$96.5B
| $13.3M | 0.01% |
24,800
-22,500
| -48% | -$11.4M |
|
948
PUT
J.M. Smucker
SJM
$12.4B
| $13.3M | 0.01% |
105,700
-5,500
| -5% | -$696K |
|
949
PUT
Insulet
PODD
$11B
| $13.3M | 0.01% |
77,600
+24,400
| +46% | +$4.55M |
|
950
CALL
Planet Fitness
PLNT
$4.29B
| $13.2M | 0.01% |
211,200
+57,200
| +37% | +$3.82M |
|
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.