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 | |
|---|---|---|---|---|---|---|
3201
PUT
BorgWarner
BWA
$13.2B
| $817K | ﹤0.01% |
22,800
+6,000
| +36% | +$214K |
|
|
PPLI
3202
PUT
People Inc
PPLI
$3.1B
| $817K | ﹤0.01% |
19,016
+3,535
| +23% | +$138K |
|
3203
PUT
Rayonier Advanced Materials
RYAM
$565M
| $816K | ﹤0.01% |
201,700
+48,700
| +32% | +$160K |
|
3204
PUT
Iridium Communications
IRDM
$4.85B
| $814K | ﹤0.01% |
19,800
+12,700
| +179% | +$503K |
|
3205
CALL
Cogent Communications
CCOI
$594M
| $813K | ﹤0.01% |
10,700
+4,600
| +75% | +$307K |
|
3206
PUT
VICI Properties
VICI
$29.4B
| $812K | ﹤0.01% |
25,500
+2,100
| +9% | +$61.7K |
|
3207
iShares MSCI China ETF
MCHI
$6.04B
| $811K | ﹤0.01% |
19,923
-22,583
| -53% | -$952K |
|
3208
CALL
Trex
TREX
$4.51B
| $811K | ﹤0.01% |
9,800
-23,400
| -70% | -$1.55M |
|
3209
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $810K | ﹤0.01% |
6,600
-300
| -4% | -$35.8K |
|
3210
CALL
Glaukos
GKOS
$9.02B
| $810K | ﹤0.01% |
10,200
-4,300
| -30% | -$293K |
|
|
HBI
3211
PUT
DELISTED
Hanesbrands
HBI
| $810K | ﹤0.01% |
181,700
-89,600
| -33% | -$365K |
|
3212
PUT
Principal Financial Group
PFG
$23.6B
| $810K | ﹤0.01% |
10,300
+6,600
| +178% | +$478K |
|
3213
TeraWulf
WULF
$9.15B
| $810K | ﹤0.01% |
+337,893
| New | +$460K |
|
3214
PUT
Unum
UNM
$13.8B
| $809K | ﹤0.01% |
17,900
+2,000
| +13% | +$91.1K |
|
3215
Fortuna Silver Mines
FSM
$2.59B
| $807K | ﹤0.01% |
+209,197
| New | +$699K |
|
3216
CALL
Otter Tail
OTTR
$3.88B
| $807K | ﹤0.01% |
9,500
+8,500
| +850% | +$656K |
|
3217
CALL
Rithm Capital
RITM
$5.09B
| $807K | ﹤0.01% |
75,600
-60,300
| -44% | -$600K |
|
3218
PUT
Brookfield Renewable
BEPC
$6.12B
| $806K | ﹤0.01% |
28,000
+22,500
| +409% | +$574K |
|
3219
iShares Russell 1000 ETF
IWB
$47.7B
| $806K | ﹤0.01% |
+3,075
| New | +$753K |
|
3220
PUT
Medifast
MED
$108M
| $806K | ﹤0.01% |
12,000
+8,300
| +224% | +$578K |
|
3221
iShares MSCI Hong Kong ETF
EWH
$1.22B
| $805K | ﹤0.01% |
46,382
+44,258
| +2,084% | +$757K |
|
|
SLNO
3222
PUT
DELISTED
Soleno Therapeutics
SLNO
| $805K | ﹤0.01% |
+20,000
| New | +$569K |
|
3223
PUT
Tilray
TLRY
$479M
| $805K | ﹤0.01% |
35,180
+3,070
| +10% | +$59.2K |
|
3224
CALL
WillScot Mobile Mini Holdings
WSC
$4.8B
| $805K | ﹤0.01% |
18,100
+5,000
| +38% | +$202K |
|
3225
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $804K | ﹤0.01% |
16,000
-39,800
| -71% | -$1.08M |
|
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.