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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4301
PUT
Rhythm Pharmaceuticals
RYTM
$7.29B
| $280K | ﹤0.01% |
6,100
+2,900
| +91% | +$91.5K |
|
|
SFIX
4302
PUT
Stitch Fix
SFIX
$563M
| $280K | ﹤0.01% |
78,500
+700
| +0.9% | +$2.47K |
|
4303
Beam Global
BEEM
$21.6M
| $279K | ﹤0.01% |
39,400
+31,190
| +380% | +$196K |
|
4304
CALL
Lightwave Logic
LWLG
$823M
| $279K | ﹤0.01% |
56,100
-2,400
| -4% | -$11.3K |
|
4305
CALL
OGE Energy
OGE
$9.86B
| $279K | ﹤0.01% |
8,000
+6,800
| +567% | +$235K |
|
4306
PUT
Radian Group
RDN
$5.27B
| $279K | ﹤0.01% |
9,800
+6,000
| +158% | +$158K |
|
4307
PUT
Upwork
UPWK
$1.18B
| $279K | ﹤0.01% |
18,800
-28,600
| -60% | -$369K |
|
4308
US Foods
USFD
$22.5B
| $279K | ﹤0.01% |
+6,146
| New | +$254K |
|
4309
PUT
Helmerich & Payne
HP
$3.34B
| $278K | ﹤0.01% |
7,700
+2,800
| +57% | +$108K |
|
4310
CALL
Medallion Financial
MFIN
$229M
| $278K | ﹤0.01% |
28,300
+26,600
| +1,565% | +$221K |
|
|
BECN
4311
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $278K | ﹤0.01% |
3,200
| – | – |
|
4312
CALL
Vita Coco
COCO
$3.91B
| $277K | ﹤0.01% |
10,800
-300
| -3% | -$8.14K |
|
4313
CALL
KB Financial Group
KB
$39.7B
| $277K | ﹤0.01% |
6,700
+1,700
| +34% | +$68.8K |
|
4314
CALL
Kymera Therapeutics
KYMR
$8.64B
| $277K | ﹤0.01% |
10,900
+2,000
| +22% | +$35.8K |
|
4315
Vanguard High Dividend Yield ETF
VYM
$80.9B
| $277K | ﹤0.01% |
2,486
+212
| +9% | +$22.3K |
|
|
SQSP
4316
CALL
DELISTED
Squarespace, Inc.
SQSP
| $277K | ﹤0.01% |
8,400
-13,400
| -61% | -$392K |
|
|
EVBG
4317
PUT
DELISTED
Everbridge, Inc. Common Stock
EVBG
| $277K | ﹤0.01% |
11,400
+6,000
| +111% | +$129K |
|
4318
CALL
Applied Industrial Technologies
AIT
$12.3B
| $276K | ﹤0.01% |
1,600
+800
| +100% | +$130K |
|
4319
Stantec
STN
$8.18B
| $276K | ﹤0.01% |
+3,448
| New | +$239K |
|
|
AMED
4320
CALL
DELISTED
Amedisys
AMED
| $275K | ﹤0.01% |
2,900
+2,000
| +222% | +$187K |
|
4321
CALL
Flywire
FLYW
$2.05B
| $275K | ﹤0.01% |
11,900
+1,400
| +13% | +$35.3K |
|
4322
iShares US Technology ETF
IYW
$22.7B
| $275K | ﹤0.01% |
+2,245
| New | +$254K |
|
4323
PagSeguro Digital
PAGS
$2.67B
| $275K | ﹤0.01% |
22,086
-93,175
| -81% | -$857K |
|
4324
CALL
Phreesia
PHR
$687M
| $275K | ﹤0.01% |
11,900
+7,600
| +177% | +$131K |
|
4325
CALL
Portillo's
PTLO
$343M
| $275K | ﹤0.01% |
17,300
+6,300
| +57% | +$97.3K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.