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 | |
|---|---|---|---|---|---|---|
3026
CALL
SBA Communications
SBAC
$18.4B
| $890K | ﹤0.01% |
3,700
-3,500
| -49% | -$776K |
|
3027
Fastly Inc
FSLY
$3.17B
| $888K | ﹤0.01% |
117,329
-61,933
| -35% | -$430K |
|
3028
Melco Resorts & Entertainment
MLCO
$2.1B
| $887K | ﹤0.01% |
113,883
+22,258
| +24% | +$131K |
|
3029
CALL
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.81B
| $886K | ﹤0.01% |
18,600
+17,100
| +1,140% | +$773K |
|
3030
PUT
Eos Energy Enterprises
EOSE
$1.23B
| $885K | ﹤0.01% |
298,300
+135,900
| +84% | +$288K |
|
3031
Procore
PCOR
$6.46B
| $884K | ﹤0.01% |
+14,325
| New | +$879K |
|
3032
CALL
Antero Midstream
AM
$10.8B
| $883K | ﹤0.01% |
58,700
+17,700
| +43% | +$258K |
|
3033
PUT
Array Technologies
ARRY
$818M
| $883K | ﹤0.01% |
133,800
+60,300
| +82% | +$496K |
|
3034
PUT
Seadrill
SDRL
$2.81B
| $882K | ﹤0.01% |
22,200
+400
| +2% | +$18.4K |
|
3035
PUT
Camping World
CWH
$363M
| $881K | ﹤0.01% |
36,400
-98,900
| -73% | -$2.13M |
|
3036
PUT
Procept Biorobotics
PRCT
$950M
| $881K | ﹤0.01% |
11,000
+5,900
| +116% | +$419K |
|
3037
Rockwell Automation
ROK
$51.4B
| $881K | ﹤0.01% |
3,282
-1,157
| -26% | -$307K |
|
3038
PUT
Newell Brands
NWL
$2.16B
| $879K | ﹤0.01% |
114,500
+53,000
| +86% | +$380K |
|
3039
CALL
Tradeweb Markets
TW
$21.3B
| $878K | ﹤0.01% |
7,100
+6,000
| +545% | +$680K |
|
3040
PUT
Capricor Therapeutics
CAPR
$1.14B
| $877K | ﹤0.01% |
57,700
+54,500
| +1,703% | +$270K |
|
3041
GigaCloud Technology
GCT
$1.35B
| $877K | ﹤0.01% |
+38,201
| New | +$917K |
|
3042
US Foods
USFD
$21.4B
| $877K | ﹤0.01% |
14,274
-20,155
| -59% | -$1.13M |
|
3043
CALL
Shoals Technologies Group
SHLS
$1.58B
| $876K | ﹤0.01% |
156,200
+46,700
| +43% | +$279K |
|
3044
CALL
Portillo's
PTLO
$315M
| $875K | ﹤0.01% |
65,000
+2,200
| +4% | +$24.6K |
|
3045
SharkNinja
SN
$21B
| $875K | ﹤0.01% |
+8,053
| New | +$700K |
|
3046
PUT
Navient
NAVI
$774M
| $874K | ﹤0.01% |
56,100
+6,500
| +13% | +$100K |
|
3047
Teekay
TK
$975M
| $872K | ﹤0.01% |
94,850
+90,002
| +1,856% | +$748K |
|
3048
PUT
Equity Residential
EQR
$25.4B
| $871K | ﹤0.01% |
11,700
-2,800
| -19% | -$202K |
|
3049
CALL
Fulcrum Therapeutics
FULC
$248M
| $868K | ﹤0.01% |
243,300
+151,500
| +165% | +$1.12M |
|
3050
PUT
Box
BOX
$4.02B
| $867K | ﹤0.01% |
26,500
+2,700
| +11% | +$78.8K |
|
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.