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 | |
|---|---|---|---|---|---|---|
976
Maplebear
CART
$10B
| $12.7M | 0.01% |
341,197
+295,578
| +648% | +$8.65M |
|
977
Marvell Technology
MRVL
$188B
| $12.7M | 0.01% |
179,491
+133,687
| +292% | +$9.16M |
|
978
PUT
International Flavors & Fragrances
IFF
$18.8B
| $12.7M | 0.01% |
147,500
+26,000
| +21% | +$2.09M |
|
979
CALL
BHP
BHP
$212B
| $12.6M | 0.01% |
218,900
-30,700
| -12% | -$1.84M |
|
980
CALL
Coherent
COHR
$61.3B
| $12.6M | 0.01% |
208,300
+35,200
| +20% | +$1.93M |
|
981
PUT
Plug Power
PLUG
$3.06B
| $12.6M | 0.01% |
3,650,200
+1,303,600
| +56% | +$4.84M |
|
982
CALL
iShares Gold Trust
IAU
$62.9B
| $12.6M | 0.01% |
298,800
-208,200
| -41% | -$8.16M |
|
983
PUT
Prologis
PLD
$135B
| $12.5M | 0.01% |
96,200
+25,100
| +35% | +$3.28M |
|
|
MPT
984
PUT
Medical Properties Trust
MPT
$2.87B
| $12.5M | 0.01% |
2,663,900
+1,242,100
| +87% | +$4.76M |
|
985
PUT
BRC Group Holdings
RILY
$279M
| $12.5M | 0.01% |
591,400
+233,700
| +65% | +$4.69M |
|
986
PUT
C.H. Robinson
CHRW
$24.2B
| $12.5M | 0.01% |
164,300
+40,500
| +33% | +$3.17M |
|
987
PUT
Semtech
SMTC
$12.9B
| $12.5M | 0.01% |
454,900
+423,600
| +1,353% | +$9.05M |
|
988
Cytokinetics
CYTK
$11.1B
| $12.5M | 0.01% |
+178,309
| New | +$13.8M |
|
989
PUT
British American Tobacco
BTI
$129B
| $12.5M | 0.01% |
409,800
-48,700
| -11% | -$1.47M |
|
990
Chevron
CVX
$387B
| $12.5M | 0.01% |
79,204
-120,665
| -60% | -$18.2M |
|
991
PUT
DuPont de Nemours
DD
$18.6B
| $12.5M | 0.01% |
380,408
+45,649
| +14% | +$4.06M |
|
992
CALL
Cognizant
CTSH
$20.3B
| $12.5M | 0.01% |
170,100
+63,500
| +60% | +$4.85M |
|
993
PUT
Automatic Data Processing
ADP
$97.1B
| $12.5M | 0.01% |
49,900
-71,000
| -59% | -$17.3M |
|
994
PUT
Polaris
PII
$4.13B
| $12.4M | 0.01% |
124,300
-41,400
| -25% | -$3.8M |
|
995
CALL
DigitalOcean
DOCN
$15.3B
| $12.4M | 0.01% |
325,900
+74,200
| +29% | +$2.76M |
|
996
PUT
Avis
CAR
$5.62B
| $12.4M | 0.01% |
101,300
-68,400
| -40% | -$9.44M |
|
997
PUT
M&T Bank
MTB
$35.6B
| $12.4M | 0.01% |
85,000
+33,100
| +64% | +$4.59M |
|
|
TYNS
998
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $12.4M | 0.01% |
110,200
-133,100
| -55% | -$14.9M |
|
999
CALL
Chemours
CC
$2.63B
| $12.3M | 0.01% |
469,400
+359,100
| +326% | +$10.2M |
|
1000
CALL
Fidelity National Information Services
FIS
$20.7B
| $12.3M | 0.01% |
166,100
-21,500
| -11% | -$1.4M |
|
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.