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 | |
|---|---|---|---|---|---|---|
3826
PUT
Allot
ALLT
$364M
| $403K | ﹤0.01% |
136,000
+61,800
| +83% | +$186K |
|
3827
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.66B
| $403K | ﹤0.01% |
18,100
+13,900
| +331% | +$310K |
|
3828
CALL
News Corp Class B
NWS
$17.3B
| $403K | ﹤0.01% |
15,100
-1,300
| -8% | -$36.7K |
|
3829
CALL
Suburban Propane Partners
SPH
$1.25B
| $403K | ﹤0.01% |
22,500
+8,200
| +57% | +$148K |
|
|
OLK
3830
PUT
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $403K | ﹤0.01% |
15,500
-100
| -0.6% | -$2.58K |
|
3831
Clean Harbors
CLH
$16B
| $402K | ﹤0.01% |
+1,666
| New | +$392K |
|
|
SEE
3832
PUT
DELISTED
Sealed Air
SEE
| $402K | ﹤0.01% |
11,100
-173,900
| -94% | -$6.07M |
|
3833
Glaukos
GKOS
$8.68B
| $401K | ﹤0.01% |
3,079
+843
| +38% | +$105K |
|
3834
Direxion Daily FTSE China Bear 3X ETF
YANG
$89.4M
| $401K | ﹤0.01% |
4,823
+2,650
| +122% | +$442K |
|
|
ALTR
3835
CALL
DELISTED
Altair Engineering Inc
ALTR
| $401K | ﹤0.01% |
+4,200
| New | +$381K |
|
3836
CALL
AppFolio
APPF
$6.38B
| $400K | ﹤0.01% |
1,700
-700
| -29% | -$164K |
|
|
ARI
3837
PUT
Apollo Commercial Real Estate
ARI
$884M
| $400K | ﹤0.01% |
43,600
+20,500
| +89% | +$209K |
|
3838
Meritage Homes
MTH
$5.01B
| $400K | ﹤0.01% |
+3,906
| New | +$369K |
|
3839
CALL
Brookfield Infrastructure
BIPC
$5.12B
| $399K | ﹤0.01% |
9,200
+1,900
| +26% | +$73.9K |
|
3840
CALL
Concentrix
CNXC
$1.54B
| $399K | ﹤0.01% |
7,800
-38,200
| -83% | -$2.56M |
|
|
LNW
3841
CALL
DELISTED
Light & Wonder
LNW
| $399K | ﹤0.01% |
4,400
-8,700
| -66% | -$912K |
|
3842
PUT
MakeMyTrip
MMYT
$5.07B
| $399K | ﹤0.01% |
4,300
-10,100
| -70% | -$953K |
|
3843
CALL
Algonquin Power & Utilities
AQN
$4.74B
| $398K | ﹤0.01% |
73,200
-3,500
| -5% | -$19.9K |
|
3844
Jacobs Solutions
J
$16.3B
| $397K | ﹤0.01% |
3,069
-2,495
| -45% | -$301K |
|
3845
CALL
LCI Industries
LCII
$2.61B
| $397K | ﹤0.01% |
3,300
+800
| +32% | +$90.4K |
|
3846
PUT
Paysafe
PSFE
$465M
| $397K | ﹤0.01% |
17,700
+500
| +3% | +$10.4K |
|
3847
CALL
Broadstone Net Lease
BNL
$4.32B
| $396K | ﹤0.01% |
20,900
+1,700
| +9% | +$30.1K |
|
3848
CALL
INmune Bio
INMB
$44.9M
| $396K | ﹤0.01% |
73,600
+67,800
| +1,169% | +$482K |
|
|
MAPS
3849
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $396K | ﹤0.01% |
455,400
+125,900
| +38% | +$125K |
|
3850
PUT
Portillo's
PTLO
$340M
| $396K | ﹤0.01% |
29,400
-59,300
| -67% | -$662K |
|
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.