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 | |
|---|---|---|---|---|---|---|
6401
PUT
BJ's Restaurants
BJRI
$1.56B
| $25K | ﹤0.01% |
+1,100
| New | +$33.8K |
|
6402
Blackbaud
BLKB
$1.82B
| $25K | ﹤0.01% |
+358
| New | +$26.4K |
|
|
BRFS
6403
DELISTED
BRF SA
BRFS
| $25K | ﹤0.01% |
12,667
+1,988
| +19% | +$3.88K |
|
6404
PUT
Compañía de Minas Buenaventura
BVN
$8.09B
| $25K | ﹤0.01% |
3,000
-92,500
| -97% | -$741K |
|
6405
PUT
CBIZ
CBZ
$3B
| $25K | ﹤0.01% |
+500
| New | +$26.9K |
|
6406
Clene
CLNN
$64.4M
| $25K | ﹤0.01% |
2,618
+157
| +6% | +$2.17K |
|
6407
Cogent Biosciences
COGT
$7.07B
| $25K | ﹤0.01% |
+2,629
| New | +$31.2K |
|
6408
Invesco China Technology ETF
CQQQ
$2.99B
| $25K | ﹤0.01% |
712
-292
| -29% | -$11.6K |
|
6409
PUT
Dime Commercial Bancshares
DCOM
$1.8B
| $25K | ﹤0.01% |
1,300
-9,400
| -88% | -$196K |
|
6410
CALL
Douglas Emmett
DEI
$2.02B
| $25K | ﹤0.01% |
2,000
-7,700
| -79% | -$104K |
|
|
DOG
6411
ProShares Short Dow30
DOG
$110M
| $25K | ﹤0.01% |
+761
| New | +$24.6K |
|
6412
PUT
8x8 Inc
EGHT
$262M
| $25K | ﹤0.01% |
10,200
-100
| -1% | -$355 |
|
6413
CALL
Enova International
ENVA
$6.31B
| $25K | ﹤0.01% |
500
-2,700
| -84% | -$141K |
|
6414
PUT
Evolus
EOLS
$396M
| $25K | ﹤0.01% |
2,800
+2,500
| +833% | +$22.4K |
|
6415
PUT
First Hawaiian
FHB
$3.4B
| $25K | ﹤0.01% |
+1,400
| New | +$27K |
|
6416
Franklin Wireless
FKWL
$27.3M
| $25K | ﹤0.01% |
7,917
-7,889
| -50% | -$25.8K |
|
6417
Forrester Research
FORR
$189M
| $25K | ﹤0.01% |
866
+605
| +232% | +$18.6K |
|
6418
CALL
Hain Celestial
HAIN
$44.4M
| $25K | ﹤0.01% |
2,500
+1,500
| +150% | +$17.3K |
|
6419
CALL
Fusion Fuel Green
HTOO
$18.3M
| $25K | ﹤0.01% |
809
-220
| -21% | -$13.9K |
|
6420
CALL
KNOT Offshore Partners
KNOP
$358M
| $25K | ﹤0.01% |
3,800
-1,000
| -21% | -$5.65K |
|
6421
PUT
Kratos Defense & Security Solutions
KTOS
$8.66B
| $25K | ﹤0.01% |
1,700
-100
| -6% | -$1.49K |
|
|
KZR
6422
PUT
DELISTED
Kezar Life Sciences
KZR
| $25K | ﹤0.01% |
2,180
+1,270
| +140% | +$22.5K |
|
6423
PUT
LifeMD
LFMD
$176M
| $25K | ﹤0.01% |
4,100
+600
| +17% | +$2.6K |
|
6424
Lemonade
LMND
$3.76B
| $25K | ﹤0.01% |
2,181
+1,428
| +190% | +$22.9K |
|
6425
CALL
Matrix Service
MTRX
$320M
| $25K | ﹤0.01% |
+2,200
| New | +$16.7K |
|
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.