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 | |
|---|---|---|---|---|---|---|
|
IAS
6976
CALL
DELISTED
Integral Ad Science
IAS
| $13K | ﹤0.01% |
+1,100
| New | +$17K |
|
6977
iRadimed
IRMD
$1.21B
| $13K | ﹤0.01% |
+294
| New | +$13.7K |
|
|
JBGS
6978
CALL
JBG SMITH
JBGS
$845M
| $13K | ﹤0.01% |
900
-500
| -36% | -$7.74K |
|
6979
PUT
MediaAlpha
MAX
$754M
| $13K | ﹤0.01% |
1,600
+1,300
| +433% | +$11.6K |
|
6980
PUT
Merchants Bancorp
MBIN
$2.57B
| $13K | ﹤0.01% |
500
-300
| -38% | -$8.66K |
|
6981
PUT
Merit Medical Systems
MMSI
$4.8B
| $13K | ﹤0.01% |
+200
| New | +$14.4K |
|
6982
CALL
Monro
MNRO
$428M
| $13K | ﹤0.01% |
500
-3,300
| -87% | -$114K |
|
6983
CALL
Movado Group
MOV
$843M
| $13K | ﹤0.01% |
500
-1,700
| -77% | -$46.3K |
|
6984
PUT
Manitowoc
MTW
$497M
| $13K | ﹤0.01% |
900
| – | – |
|
|
ADAM
6985
PUT
Adamas Trust
ADAM
$784M
| $13K | ﹤0.01% |
1,600
-1,100
| -41% | -$10.4K |
|
|
OCFT
6986
CALL
DELISTED
OneConnect Financial Technology
OCFT
| $13K | ﹤0.01% |
4,300
+800
| +23% | +$2.83K |
|
|
OLP
6987
CALL
One Liberty Properties
OLP
$546M
| $13K | ﹤0.01% |
700
-400
| -36% | -$7.96K |
|
6988
OPAL Fuels
OPAL
$64.7M
| $13K | ﹤0.01% |
+1,703
| New | +$12.5K |
|
6989
PUT
OptimizeRx
OPRX
$120M
| $13K | ﹤0.01% |
1,700
+800
| +89% | +$8.71K |
|
|
OTLY
6990
Oatly Group
OTLY
$481M
| $13K | ﹤0.01% |
+774
| New | +$22.5K |
|
|
PCH
6991
PUT
DELISTED
PotlatchDeltic
PCH
| $13K | ﹤0.01% |
300
-100
| -25% | -$4.94K |
|
|
PHX
6992
DELISTED
PHX Minerals
PHX
| $13K | ﹤0.01% |
3,733
+1,634
| +78% | +$5.48K |
|
|
PKST
6993
CALL
DELISTED
Peakstone Realty Trust
PKST
| $13K | ﹤0.01% |
800
+500
| +167% | +$10.6K |
|
6994
PUT
Pilgrim's Pride
PPC
$7.11B
| $13K | ﹤0.01% |
600
+200
| +50% | +$4.87K |
|
|
PRPH
6995
DELISTED
ProPhase Labs
PRPH
| $13K | ﹤0.01% |
319
-139
| -30% | -$8.14K |
|
6996
Replimune Group
REPL
$444M
| $13K | ﹤0.01% |
764
-40,568
| -98% | -$797K |
|
6997
CALL
Resources Connection
RGP
$139M
| $13K | ﹤0.01% |
900
+400
| +80% | +$6.29K |
|
6998
CALL
Rogers Corp
ROG
$2.11B
| $13K | ﹤0.01% |
100
-1,500
| -94% | -$224K |
|
6999
CALL
Red Robin
RRGB
$140M
| $13K | ﹤0.01% |
1,700
-100
| -6% | -$1.19K |
|
7000
Schwab US REIT ETF
SCHH
$11.7B
| $13K | ﹤0.01% |
765
+17
| +2% | +$327 |
|
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.