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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2501
CALL
Tenaris
TS
$29.1B
| $918K | ﹤0.01% |
405
+284
| +235% | +$5.43K |
|
|
XIFR
2502
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $918K | ﹤0.01% |
126
-2
| -2% | -$154 |
|
|
TRTN
2503
CALL
DELISTED
Triton International Limited
TRTN
| $918K | ﹤0.01% |
167
-25
| -13% | -$1.34K |
|
|
BBL
2504
DELISTED
BHP Group Plc American Depositary Shares (Each representing two Ordinary Shares)
BBL
| $918K | ﹤0.01% |
+15,869
| New | +$943K |
|
2505
Campbell Soup
CPB
$6.51B
| $917K | ﹤0.01% |
18,246
-3,265
| -15% | -$156K |
|
2506
Sabesp
SBS
$19.7B
| $917K | ﹤0.01% |
645,236
+172,816
| +37% | +$249K |
|
2507
Conagra Brands
CAG
$7.07B
| $916K | ﹤0.01% |
24,383
+17,499
| +254% | +$619K |
|
2508
Idexx Laboratories
IDXX
$42.9B
| $914K | ﹤0.01% |
+1,869
| New | +$936K |
|
2509
Weyerhaeuser
WY
$17.3B
| $914K | ﹤0.01% |
25,683
+6,558
| +34% | +$223K |
|
2510
CALL
Henry Schein
HSIC
$9.74B
| $913K | ﹤0.01% |
132
+41
| +45% | +$2.77K |
|
|
IPOD
2511
DELISTED
Social Capital Hedosophia Holdings Corp. IV
IPOD
| $913K | ﹤0.01% |
+83,309
| New | +$1.19M |
|
2512
Ecopetrol
EC
$32.9B
| $912K | ﹤0.01% |
71,208
+66,942
| +1,569% | +$865K |
|
2513
Becton Dickinson
BDX
$43.1B
| $911K | ﹤0.01% |
3,844
-22,095
| -85% | -$5.4M |
|
2514
PUT
Herc Holdings
HRI
$5.43B
| $911K | ﹤0.01% |
90
+85
| +1,700% | +$6.88K |
|
2515
CALL
Markel Group
MKL
$25B
| $911K | ﹤0.01% |
+8
| New | +$8.63K |
|
|
P
2516
PUT
Everpure Inc
P
$24.8B
| $911K | ﹤0.01% |
423
+168
| +66% | +$4K |
|
2517
CALL
Veru
VERU
$36.1M
| $911K | ﹤0.01% |
85
+18
| +27% | +$2.27K |
|
2518
ProShares Short QQQ
PSQ
$829M
| $910K | ﹤0.01% |
13,094
-5,244
| -29% | -$368K |
|
2519
PUT
Avnet
AVT
$7.33B
| $909K | ﹤0.01% |
219
-32
| -13% | -$1.24K |
|
2520
CALL
Shoals Technologies Group
SHLS
$1.58B
| $907K | ﹤0.01% |
+261
| New | +$9.25K |
|
2521
PUT
UDR
UDR
$12.9B
| $907K | ﹤0.01% |
207
+56
| +37% | +$2.32K |
|
|
SWAV
2522
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $907K | ﹤0.01% |
6,963
+1,796
| +35% | +$215K |
|
2523
Healthpeak Properties
DOC
$15.4B
| $906K | ﹤0.01% |
+28,575
| New | +$868K |
|
2524
PUT
Johnson Controls International
JCI
$87.5B
| $906K | ﹤0.01% |
152
-971
| -86% | -$53.4K |
|
|
SILV
2525
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $905K | ﹤0.01% |
112,093
+85,324
| +319% | +$782K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.