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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
726
PUT
Tyson Foods
TSN
$20B
| $17.2M | 0.01% |
288,600
-35,600
| -11% | -$2.17M |
|
727
CALL
Riot Platforms
RIOT
$9.02B
| $17.2M | 0.01% |
2,313,200
+14,800
| +0.6% | +$128K |
|
728
CALL
Mondelez International
MDLZ
$77.1B
| $17.1M | 0.01% |
232,000
-18,800
| -7% | -$1.32M |
|
729
PUT
PENN Entertainment
PENN
$2.71B
| $17.1M | 0.01% |
906,200
+222,100
| +32% | +$4.23M |
|
730
PUT
Deckers Outdoor
DECK
$13.4B
| $17M | 0.01% |
106,900
-484,700
| -82% | -$73.9M |
|
731
PUT
BioNTech
BNTX
$23.3B
| $17M | 0.01% |
142,900
+8,000
| +6% | +$735K |
|
732
CALL
Seagate
STX
$207B
| $17M | 0.01% |
154,900
+24,200
| +19% | +$2.47M |
|
733
CALL
Tractor Supply
TSCO
$15.9B
| $16.9M | 0.01% |
291,000
+92,000
| +46% | +$4.95M |
|
734
PUT
Microchip Technology
MCHP
$44.2B
| $16.9M | 0.01% |
210,200
-30,200
| -13% | -$2.49M |
|
735
PUT
C3.ai
AI
$1.27B
| $16.8M | 0.01% |
695,400
-468,600
| -40% | -$11.9M |
|
736
CALL
Ralph Lauren
RL
$22.1B
| $16.8M | 0.01% |
86,900
-7,800
| -8% | -$1.35M |
|
737
PUT
Builders FirstSource
BLDR
$7.59B
| $16.8M | 0.01% |
86,700
-8,700
| -9% | -$1.44M |
|
738
PUT
KLA
KLAC
$286B
| $16.8M | 0.01% |
217,000
+73,000
| +51% | +$5.73M |
|
739
PUT
AMC Entertainment Holdings
AMC
$2.04B
| $16.7M | 0.01% |
3,679,300
+1,662,000
| +82% | +$8.28M |
|
740
Humana
HUM
$47.4B
| $16.7M | 0.01% |
52,818
+32,317
| +158% | +$11.5M |
|
741
CALL
Fluor
FLR
$7.44B
| $16.7M | 0.01% |
350,400
+131,700
| +60% | +$6.21M |
|
|
742
CALL
BioNTech
BNTX
$23.3B
| $16.7M | 0.01% |
140,600
+48,100
| +52% | +$4.42M |
|
743
PUT
Rio Tinto
RIO
$149B
| $16.7M | 0.01% |
234,300
-127,300
| -35% | -$8.18M |
|
744
Alphabet (Google) Class C
GOOG
$3.88T
| $16.6M | 0.01% |
99,464
+87,898
| +760% | +$14.9M |
|
745
PUT
Sunrun
RUN
$2.48B
| $16.5M | 0.01% |
914,600
+75,600
| +9% | +$1.34M |
|
746
PUT
Energy Transfer Partners
ET
$70.3B
| $16.4M | 0.01% |
1,023,500
+97,900
| +11% | +$1.58M |
|
747
CALL
Nice
NICE
$5.09B
| $16.4M | 0.01% |
94,200
-51,900
| -36% | -$8.91M |
|
748
PUT
Cheniere Energy
LNG
$57B
| $16.3M | 0.01% |
90,800
-38,500
| -30% | -$6.92M |
|
749
PUT
Nu Holdings
NU
$68.5B
| $16.3M | 0.01% |
1,195,600
-56,200
| -4% | -$756K |
|
750
PUT
APA Corp
APA
$12.9B
| $16.3M | 0.01% |
665,700
+222,400
| +50% | +$6.24M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.