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 | |
|---|---|---|---|---|---|---|
|
TMHC
4726
CALL
DELISTED
Taylor Morrison
TMHC
| $192K | ﹤0.01% |
3,600
+1,700
| +89% | +$76K |
|
|
LAR
4727
PUT
Lithium Argentina AG
LAR
$906M
| $192K | ﹤0.01% |
+30,400
| New | +$183K |
|
4728
PUT
Federal Agricultural Mortgage Class A
AGM.A
$1.66B
| $191K | ﹤0.01% |
1,000
-100
| -9% | -$12.6K |
|
4729
CALL
AZZ Inc
AZZ
$4.24B
| $191K | ﹤0.01% |
3,300
-2,900
| -47% | -$143K |
|
4730
Innoviva
INVA
$1.6B
| $191K | ﹤0.01% |
+11,955
| New | +$167K |
|
4731
Schwab US TIPS ETF
SCHP
$16.4B
| $191K | ﹤0.01% |
+7,328
| New | +$186K |
|
4732
Vanguard Consumer Discretionary ETF
VCR
$5.97B
| $191K | ﹤0.01% |
629
+338
| +116% | +$94.2K |
|
4733
Domo
DOMO
$171M
| $190K | ﹤0.01% |
18,557
+459
| +3% | +$4.24K |
|
4734
CALL
Edgewise Therapeutics
EWTX
$4.28B
| $190K | ﹤0.01% |
+17,400
| New | +$122K |
|
4735
PUT
Gossamer Bio
GOSS
$101M
| $190K | ﹤0.01% |
208,300
-2,000
| -1% | -$1.48K |
|
4736
CALL
POSCO
PKX
$14.7B
| $190K | ﹤0.01% |
2,000
-14,800
| -88% | -$1.34M |
|
|
DAWN
4737
CALL
DELISTED
Day One Biopharmaceuticals
DAWN
| $189K | ﹤0.01% |
13,000
-500
| -4% | -$6.06K |
|
4738
CALL
Teekay
TK
$996M
| $188K | ﹤0.01% |
26,300
-13,700
| -34% | -$94.6K |
|
|
QVCGA
4739
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $188K | ﹤0.01% |
4,302
+658
| +18% | +$22.6K |
|
|
INFN
4740
DELISTED
Infinera Corporation Common Stock
INFN
| $188K | ﹤0.01% |
+39,645
| New | +$156K |
|
4741
CALL
BlackLine
BL
$1.9B
| $187K | ﹤0.01% |
3,000
-10,400
| -78% | -$588K |
|
4742
CALL
Dana Inc
DAN
$2.88B
| $187K | ﹤0.01% |
12,800
+4,800
| +60% | +$63.7K |
|
4743
CALL
FNB Corp
FNB
$6.76B
| $187K | ﹤0.01% |
13,600
+12,300
| +946% | +$146K |
|
4744
Pagaya Technologies
PGY
$1.35B
| $187K | ﹤0.01% |
+11,304
| New | +$184K |
|
4745
CALL
Simplify US Equity PLUS Convexity ETF
SPYC
$109M
| $187K | ﹤0.01% |
7,100
+2,800
| +65% | +$80.9K |
|
4746
CALL
Taboola.com
TBLA
$1.41B
| $187K | ﹤0.01% |
43,400
+42,500
| +4,722% | +$161K |
|
|
UCTT
4747
CALL
Ultra Clean Holdings
UCTT
$3.12B
| $187K | ﹤0.01% |
5,500
+4,600
| +511% | +$128K |
|
4748
PUT
CONMED
CNMD
$1.3B
| $186K | ﹤0.01% |
1,700
-20,000
| -92% | -$2.07M |
|
|
KLG
4749
PUT
DELISTED
WK Kellogg Co
KLG
| $186K | ﹤0.01% |
+14,200
| New | +$160K |
|
|
PLL
4750
PUT
DELISTED
Piedmont Lithium
PLL
| $186K | ﹤0.01% |
6,600
-24,700
| -79% | -$725K |
|
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.