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 | |
|---|---|---|---|---|---|---|
6251
El Pollo Loco
LOCO
$501M
| $30K | ﹤0.01% |
+3,450
| New | +$33.5K |
|
|
DFTX
6252
Definium Therapeutics
DFTX
$5.79B
| $30K | ﹤0.01% |
+9,735
| New | +$40K |
|
6253
PUT
NETGEAR
NTGR
$647M
| $30K | ﹤0.01% |
2,400
-2,200
| -48% | -$29.2K |
|
6254
OR Royalties Inc
OR
$5.61B
| $30K | ﹤0.01% |
+2,569
| New | +$35.1K |
|
6255
CALL
RELX
RELX
$61.9B
| $30K | ﹤0.01% |
+900
| New | +$29.7K |
|
|
SEM
6256
CALL
DELISTED
Select Medical
SEM
| $30K | ﹤0.01% |
2,227
+1,113
| +100% | +$17.2K |
|
|
SJT
6257
San Juan Basin Royalty Trust
SJT
$117M
| $30K | ﹤0.01% |
4,376
-21,037
| -83% | -$151K |
|
6258
ProShares UltraShort Semiconductors
SSG
$50.4M
| $30K | ﹤0.01% |
40
+38
| +1,900% | +$27.7K |
|
6259
BlackRock TCP Capital
TCPC
$270M
| $30K | ﹤0.01% |
2,605
+2,002
| +332% | +$24.1K |
|
|
TPH
6260
CALL
DELISTED
Tri Pointe Homes
TPH
| $30K | ﹤0.01% |
1,100
-5,600
| -84% | -$172K |
|
6261
Mammoth Energy Services
TUSK
$127M
| $30K | ﹤0.01% |
+6,496
| New | +$31.6K |
|
|
UCTT
6262
Ultra Clean Holdings
UCTT
$3.81B
| $30K | ﹤0.01% |
1,033
-511
| -33% | -$17.2K |
|
|
UDMY
6263
PUT
DELISTED
Udemy
UDMY
| $30K | ﹤0.01% |
3,200
-17,200
| -84% | -$180K |
|
6264
CALL
NCR Voyix
VYX
$1.15B
| $30K | ﹤0.01% |
30,481
+7,172
| +31% | +$122K |
|
6265
PUT
XPEL
XPEL
$1.21B
| $30K | ﹤0.01% |
400
-800
| -67% | -$64.3K |
|
|
YALA
6266
Yalla Group
YALA
$815M
| $30K | ﹤0.01% |
5,902
-11,322
| -66% | -$57.6K |
|
6267
CALL
Metallus
MTUS
$839M
| $30K | ﹤0.01% |
1,400
-16,500
| -92% | -$360K |
|
|
LGF.A
6268
DELISTED
Lions Gate Entertainment Corp. Class A Voting Shares
LGF.A
| $30K | ﹤0.01% |
+3,644
| New | +$29K |
|
|
AKTS
6269
DELISTED
Akoustis Technologies Inc
AKTS
| $30K | ﹤0.01% |
40,657
-172,642
| -81% | -$319K |
|
|
SIEN
6270
CALL
DELISTED
Sientra, Inc.
SIEN
| $30K | ﹤0.01% |
11,100
+10,600
| +2,120% | +$32.6K |
|
6271
PUT
Adicet Bio
ACET
$82.5M
| $29K | ﹤0.01% |
1,344
+719
| +115% | +$25.4K |
|
6272
CALL
Enact Holdings
ACT
$6.62B
| $29K | ﹤0.01% |
+1,100
| New | +$30.6K |
|
6273
Adtran
ADTN
$696M
| $29K | ﹤0.01% |
3,553
-20,517
| -85% | -$182K |
|
|
BRT
6274
CALL
BRT Apartments
BRT
$277M
| $29K | ﹤0.01% |
1,700
-3,500
| -67% | -$66.2K |
|
6275
Chunghwa Telecom
CHT
$33.1B
| $29K | ﹤0.01% |
834
+741
| +797% | +$27.1K |
|
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.