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 | |
|---|---|---|---|---|---|---|
|
APLT
5851
DELISTED
Applied Therapeutics
APLT
| $51K | ﹤0.01% |
+6,071
| New | +$35.8K |
|
5852
PUT
Astec Industries
ASTE
$1.16B
| $51K | ﹤0.01% |
+1,600
| New | +$51.4K |
|
5853
CALL
Atea Pharmaceuticals
AVIR
$376M
| $51K | ﹤0.01% |
15,500
-2,400
| -13% | -$8.7K |
|
5854
CALL
Century Communities
CCS
$1.91B
| $51K | ﹤0.01% |
500
+200
| +67% | +$19.1K |
|
5855
PUT
Castle Biosciences
CSTL
$849M
| $51K | ﹤0.01% |
+1,800
| New | +$45.8K |
|
|
CTO
5856
CTO Realty Growth
CTO
$824M
| $51K | ﹤0.01% |
2,717
+2,185
| +411% | +$41.6K |
|
5857
Daktronics
DAKT
$955M
| $51K | ﹤0.01% |
+3,972
| New | +$54.9K |
|
5858
PUT
Ethan Allen Interiors
ETD
$570M
| $51K | ﹤0.01% |
1,600
+1,000
| +167% | +$30.2K |
|
5859
PUT
Idacorp
IDA
$7.92B
| $51K | ﹤0.01% |
500
-700
| -58% | -$69.9K |
|
5860
nCino
NCNO
$2.02B
| $51K | ﹤0.01% |
+1,629
| New | +$51.6K |
|
5861
CALL
Nurix Therapeutics
NRIX
$2.41B
| $51K | ﹤0.01% |
2,300
-1,900
| -45% | -$43K |
|
|
ORGN
5862
DELISTED
Origin Materials
ORGN
| $51K | ﹤0.01% |
1,123
+975
| +659% | +$35.3K |
|
|
OTLY
5863
PUT
Oatly Group
OTLY
$465M
| $51K | ﹤0.01% |
2,990
-475
| -14% | -$8.92K |
|
5864
PUT
Rocket Pharmaceuticals
RCKT
$340M
| $51K | ﹤0.01% |
2,800
-700
| -20% | -$14.3K |
|
5865
CALL
Zumiez
ZUMZ
$332M
| $51K | ﹤0.01% |
2,400
-4,700
| -66% | -$112K |
|
5866
PUT
BBB Foods
TBBB
$4.98B
| $51K | ﹤0.01% |
1,700
+1,500
| +750% | +$42K |
|
|
CHUY
5867
CALL
DELISTED
Chuy's Holdings, Inc. Common Stock
CHUY
| $51K | ﹤0.01% |
+4,400
| New | +$153K |
|
|
AIV
5868
CALL
Aimco
AIV
$387M
| $50K | ﹤0.01% |
5,600
+1,000
| +22% | +$8.89K |
|
5869
CALL
Ardagh Metal Packaging
AMBP
$2.83B
| $50K | ﹤0.01% |
13,400
-29,900
| -69% | -$106K |
|
5870
CALL
America Movil
AMX
$76.1B
| $50K | ﹤0.01% |
3,100
-1,300
| -30% | -$22K |
|
5871
BioAtla
BCAB
$5.46M
| $50K | ﹤0.01% |
+570
| New | +$47.8K |
|
5872
CALL
Popular Inc
BPOP
$11.2B
| $50K | ﹤0.01% |
500
-3,200
| -86% | -$312K |
|
5873
PUT
Torrid Holdings
CURV
$254M
| $50K | ﹤0.01% |
12,900
+4,000
| +45% | +$26.9K |
|
|
CWBC
5874
CALL
Community West Bancshares
CWBC
$679M
| $50K | ﹤0.01% |
2,600
+2,200
| +550% | +$43.3K |
|
|
EFC
5875
CALL
Ellington Financial
EFC
$1.67B
| $50K | ﹤0.01% |
3,900
-27,800
| -88% | -$359K |
|
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.