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 | |
|---|---|---|---|---|---|---|
4901
PUT
Perion Network
PERI
$377M
| $138K | ﹤0.01% |
17,600
-99,900
| -85% | -$837K |
|
4902
CALL
TFS Financial
TFSL
$5.06B
| $138K | ﹤0.01% |
10,800
-1,200
| -10% | -$15.8K |
|
4903
TTEC Holdings
TTEC
$126M
| $138K | ﹤0.01% |
+23,645
| New | +$129K |
|
4904
CALL
Invesco CurrencyShares Australian Dollar Trust
FXA
$97.5M
| $137K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$126K |
|
4905
PUT
Gray Television
GTN
$417M
| $137K | ﹤0.01% |
25,600
| – | – |
|
|
MRSN
4906
DELISTED
Mersana Therapeutics
MRSN
| $137K | ﹤0.01% |
2,914
+1,368
| +88% | +$60.4K |
|
4907
Steven Madden
SHOO
$3.5B
| $137K | ﹤0.01% |
2,814
+2,812
| +140,600% | +$125K |
|
|
SNBR
4908
PUT
DELISTED
Sleep Number
SNBR
| $137K | ﹤0.01% |
7,500
+2,200
| +42% | +$28.8K |
|
4909
PUT
Upbound Group
UPBD
$1.17B
| $137K | ﹤0.01% |
4,300
+400
| +10% | +$12.9K |
|
4910
ProShares Ultra Yen
YCL
$33.1M
| $137K | ﹤0.01% |
5,563
+910
| +20% | +$21.3K |
|
|
ODV
4911
DELISTED
Osisko Development Corp
ODV
| $136K | ﹤0.01% |
64,197
+20,222
| +46% | +$42.3K |
|
|
PPTA
4912
Perpetua Resources
PPTA
$2.37B
| $136K | ﹤0.01% |
+14,564
| New | +$108K |
|
4913
CALL
Vanda Pharmaceuticals
VNDA
$312M
| $136K | ﹤0.01% |
29,200
+13,800
| +90% | +$74K |
|
|
WSR
4914
PUT
DELISTED
Whitestone REIT
WSR
| $136K | ﹤0.01% |
10,100
+100
| +1% | +$1.34K |
|
4915
iShares MSCI Taiwan ETF
EWT
$9.6B
| $135K | ﹤0.01% |
+2,519
| New | +$134K |
|
4916
Direxion Daily GOOGL Bull 2X ETF
GGLL
$871M
| $135K | ﹤0.01% |
+3,649
| New | +$144K |
|
4917
iShares S&P GSCI Commodity-Indexed Trust
GSG
$995M
| $135K | ﹤0.01% |
6,470
-1,926
| -23% | -$40.8K |
|
4918
CALL
Innoviz Technologies
INVZ
$93.2M
| $135K | ﹤0.01% |
164,100
+157,800
| +2,505% | +$120K |
|
4919
Liquidia Corp
LQDA
$7.72B
| $135K | ﹤0.01% |
13,562
-12,328
| -48% | -$135K |
|
|
PVBC
4920
DELISTED
Provident Bancorp
PVBC
| $135K | ﹤0.01% |
12,543
-174
| -1% | -$1.86K |
|
|
RDNW
4921
CALL
RideNow Group
RDNW
$248M
| $135K | ﹤0.01% |
28,300
+27,600
| +3,943% | +$114K |
|
4922
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$300M
| $135K | ﹤0.01% |
4,550
-3,710
| -45% | -$116K |
|
4923
CALL
Tiptree Inc
TIPT
$655M
| $135K | ﹤0.01% |
6,900
+3,500
| +103% | +$65K |
|
4924
PUT
Broadstone Net Lease
BNL
$4.12B
| $134K | ﹤0.01% |
7,100
-43,500
| -86% | -$769K |
|
4925
PUT
Cabot Corp
CBT
$4.55B
| $134K | ﹤0.01% |
1,200
-5,600
| -82% | -$558K |
|
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.