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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
EVRI
5051
CALL
DELISTED
Everi Holdings
EVRI
| $103K | ﹤0.01% |
7,800
-14,500
| -65% | -$206K |
|
5052
PUT
Jack in the Box
JACK
$312M
| $103K | ﹤0.01% |
1,500
-1,500
| -50% | -$128K |
|
5053
PUT
CS Disco
LAW
$254M
| $103K | ﹤0.01% |
15,600
+10,500
| +206% | +$91.5K |
|
5054
Phinia Inc
PHIN
$2.7B
| $103K | ﹤0.01% |
+3,877
| New | +$107K |
|
5055
CALL
Rogers Communications
RCI
$18.4B
| $103K | ﹤0.01% |
2,700
-4,900
| -64% | -$206K |
|
|
SPTN
5056
CALL
DELISTED
SpartanNash
SPTN
| $103K | ﹤0.01% |
4,700
-7,400
| -61% | -$163K |
|
5057
PUT
Interface
TILE
$1.96B
| $103K | ﹤0.01% |
10,600
-1,000
| -9% | -$9.7K |
|
5058
CALL
W&T Offshore
WTI
$515M
| $103K | ﹤0.01% |
23,700
-4,200
| -15% | -$17.3K |
|
|
ADVM
5059
CALL
DELISTED
Adverum Biotechnologies
ADVM
| $102K | ﹤0.01% |
6,860
+4,630
| +208% | +$83.1K |
|
5060
CALL
Credicorp
BAP
$32B
| $102K | ﹤0.01% |
800
+700
| +700% | +$102K |
|
5061
CALL
Custom Truck One Source
CTOS
$2.26B
| $102K | ﹤0.01% |
16,500
-3,000
| -15% | -$19.8K |
|
5062
PUT
Sprinklr
CXM
$1.45B
| $102K | ﹤0.01% |
7,400
+1,300
| +21% | +$18.6K |
|
|
EB
5063
PUT
DELISTED
Eventbrite
EB
| $102K | ﹤0.01% |
10,400
+6,600
| +174% | +$67.6K |
|
|
MREO
5064
CALL
Mereo BioPharma
MREO
$50.3M
| $102K | ﹤0.01% |
79,100
+22,700
| +40% | +$30.1K |
|
|
OGI
5065
CALL
Organigram Holdings
OGI
$136M
| $102K | ﹤0.01% |
77,900
+57,325
| +279% | +$86.4K |
|
5066
CALL
SiTime
SITM
$15.8B
| $102K | ﹤0.01% |
900
-3,300
| -79% | -$407K |
|
5067
CALL
Sensata Technologies
ST
$6.98B
| $102K | ﹤0.01% |
2,700
+200
| +8% | +$8.06K |
|
5068
CALL
TFI International
TFII
$11B
| $102K | ﹤0.01% |
800
-300
| -27% | -$38.1K |
|
5069
US Commodity Index
USCI
$369M
| $102K | ﹤0.01% |
+1,735
| New | +$101K |
|
|
WNS
5070
CALL
DELISTED
WNS Holdings
WNS
| $102K | ﹤0.01% |
1,500
+600
| +67% | +$40.5K |
|
5071
PUT
Commault Systems
CVLT
$4.82B
| $101K | ﹤0.01% |
1,500
| – | – |
|
|
DENN
5072
DELISTED
Denny's
DENN
| $101K | ﹤0.01% |
+11,986
| New | +$121K |
|
5073
PUT
Amdocs
DOX
$5.87B
| $101K | ﹤0.01% |
+1,200
| New | +$108K |
|
|
IAS
5074
DELISTED
Integral Ad Science
IAS
| $101K | ﹤0.01% |
+8,528
| New | +$132K |
|
5075
IPG Photonics
IPGP
$3.6B
| $101K | ﹤0.01% |
+1,002
| New | +$113K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.