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
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3726
PUT
Pediatrix Medical
MD
$2.21B
| $171K | ﹤0.01% |
76
+35
| +85% | +$798 |
|
3727
Portland General Electric
POR
$5.92B
| $171K | ﹤0.01% |
3,046
+2,265
| +290% | +$126K |
|
3728
Molson Coors Class B
TAP
$7.97B
| $171K | ﹤0.01% |
2,989
-10,550
| -78% | -$572K |
|
|
BNFT
3729
DELISTED
Benefitfocus, Inc.
BNFT
| $171K | ﹤0.01% |
7,183
+6,520
| +983% | +$167K |
|
|
CZZ
3730
CALL
DELISTED
Cosan Limited
CZZ
| $171K | ﹤0.01% |
115
+112
| +3,733% | +$1.6K |
|
3731
AutoNation
AN
$7.37B
| $170K | ﹤0.01% |
+3,361
| New | +$158K |
|
3732
Dycom Industries
DY
$12.1B
| $170K | ﹤0.01% |
+3,340
| New | +$169K |
|
3733
Lennar Class A
LEN
$21.1B
| $170K | ﹤0.01% |
3,158
-37,037
| -92% | -$1.8M |
|
|
PR
3734
PUT
Permian Resources
PR
$16.5B
| $170K | ﹤0.01% |
377
+359
| +1,994% | +$1.93K |
|
3735
CALL
West Pharmaceutical
WST
$23.7B
| $170K | ﹤0.01% |
12
+6
| +100% | +$826 |
|
|
FSCT
3736
PUT
DELISTED
ForeScout Technologies, Inc. Common Stock
FSCT
| $170K | ﹤0.01% |
45
+26
| +137% | +$950 |
|
|
HCR
3737
CALL
DELISTED
Hi-Crush Inc. Common Stock
HCR
| $170K | ﹤0.01% |
981
+364
| +59% | +$699 |
|
|
STML
3738
DELISTED
Stemline Therapeutics, Inc.
STML
| $170K | ﹤0.01% |
16,334
+12,896
| +375% | +$169K |
|
3739
Angi Inc
ANGI
$252M
| $169K | ﹤0.01% |
2,394
+1,440
| +151% | +$148K |
|
3740
Mercury Systems
MRCY
$5.97B
| $169K | ﹤0.01% |
2,090
-7,427
| -78% | -$587K |
|
3741
CALL
United Natural Foods
UNFI
$3.07B
| $169K | ﹤0.01% |
147
+75
| +104% | +$716 |
|
3742
PUT
AAR Corp
AIR
$5.62B
| $168K | ﹤0.01% |
+41
| New | +$1.72K |
|
3743
PUT
Banc of California
BANC
$3.27B
| $168K | ﹤0.01% |
119
+68
| +133% | +$982 |
|
3744
PUT
Vanguard Total Bond Market
BND
$158B
| $168K | ﹤0.01% |
+20
| New | +$1.68K |
|
3745
CALL
Curtiss-Wright
CW
$26.9B
| $168K | ﹤0.01% |
13
+6
| +86% | +$755 |
|
3746
Equity Residential
EQR
$25.5B
| $168K | ﹤0.01% |
1,951
-158
| -7% | -$12.9K |
|
3747
CALL
Comfort Systems
FIX
$57.2B
| $168K | ﹤0.01% |
38
+35
| +1,167% | +$1.53K |
|
3748
CALL
Cloudflare
NET
$93.7B
| $168K | ﹤0.01% |
+91
| New | +$1.76K |
|
3749
Rithm Capital
RITM
$5.46B
| $168K | ﹤0.01% |
+10,756
| New | +$161K |
|
3750
CALL
Winnebago Industries
WGO
$908M
| $168K | ﹤0.01% |
44
+8
| +22% | +$291 |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.