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 | |
|---|---|---|---|---|---|---|
4576
PUT
Monro
MNRO
$414M
| $220K | ﹤0.01% |
7,500
+4,200
| +127% | +$118K |
|
4577
PUT
Old Republic International
ORI
$10.9B
| $220K | ﹤0.01% |
7,500
-2,300
| -23% | -$64.7K |
|
4578
PUT
Seanergy Maritime Holdings
SHIP
$349M
| $220K | ﹤0.01% |
28,100
-50,800
| -64% | -$317K |
|
4579
CALL
Zevra Therapeutics
ZVRA
$578M
| $220K | ﹤0.01% |
33,600
+4,600
| +16% | +$21.5K |
|
4580
PUT
ABM Industries
ABM
$2.89B
| $219K | ﹤0.01% |
4,900
+3,900
| +390% | +$165K |
|
|
AKRO
4581
PUT
DELISTED
Akero Therapeutics
AKRO
| $219K | ﹤0.01% |
9,400
-63,000
| -87% | -$1.24M |
|
4582
Digimarc Corp
DMRC
$143M
| $219K | ﹤0.01% |
6,086
+228
| +4% | +$7.22K |
|
4583
CALL
Amdocs
DOX
$6.03B
| $219K | ﹤0.01% |
+2,500
| New | +$208K |
|
|
NVMI
4584
PUT
Nova
NVMI
$11.7B
| $219K | ﹤0.01% |
1,600
-8,200
| -84% | -$948K |
|
4585
QuickLogic
QUIK
$211M
| $219K | ﹤0.01% |
+15,872
| New | +$171K |
|
4586
USA Compression Partners
USAC
$3.69B
| $219K | ﹤0.01% |
+9,616
| New | +$238K |
|
4587
CALL
Vroom Inc
VRM
$36.4M
| $219K | ﹤0.01% |
4,555
-1,888
| -29% | -$123K |
|
|
4588
ABM Industries
ABM
$2.89B
| $218K | ﹤0.01% |
4,870
+4,219
| +648% | +$178K |
|
4589
loanDepot
LDI
$548M
| $218K | ﹤0.01% |
62,079
+60,324
| +3,437% | +$113K |
|
4590
CALL
Oppenheimer Holdings
OPY
$1.18B
| $218K | ﹤0.01% |
5,300
+1,200
| +29% | +$45.9K |
|
4591
PetMed Express
PETS
$42.3M
| $218K | ﹤0.01% |
+28,865
| New | +$237K |
|
4592
Companhia Siderúrgica Nacional
SID
$1.37B
| $218K | ﹤0.01% |
55,541
-113,630
| -67% | -$329K |
|
4593
CALL
Smith & Nephew
SNN
$13.7B
| $218K | ﹤0.01% |
8,000
+5,600
| +233% | +$139K |
|
4594
Shutterstock
SSTK
$209M
| $218K | ﹤0.01% |
+4,521
| New | +$191K |
|
4595
CALL
Healthpeak Properties
DOC
$15.5B
| $217K | ﹤0.01% |
11,000
+5,200
| +90% | +$91.5K |
|
|
IAS
4596
PUT
DELISTED
Integral Ad Science
IAS
| $217K | ﹤0.01% |
15,100
-200
| -1% | -$2.68K |
|
4597
CALL
J&J Snack Foods
JJSF
$1.49B
| $217K | ﹤0.01% |
+1,300
| New | +$211K |
|
4598
PUT
Relmada Therapeutics
RLMD
$540M
| $217K | ﹤0.01% |
52,600
+4,400
| +9% | +$13K |
|
4599
CALL
Talos Energy
TALO
$2.38B
| $217K | ﹤0.01% |
15,300
-23,300
| -60% | -$341K |
|
4600
PUT
Alpha Pro Tech
APT
$49.9M
| $216K | ﹤0.01% |
41,000
+13,400
| +49% | +$61.5K |
|
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.