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 | |
|---|---|---|---|---|---|---|
2351
CALL
TG Therapeutics
TGTX
$8.58B
| $646K | ﹤0.01% |
1,152
-923
| -44% | -$6.43K |
|
2352
Willis Towers Watson
WTW
$27.9B
| $646K | ﹤0.01% |
3,349
+2,931
| +701% | +$572K |
|
2353
The Mosaic Company
MOS
$7.09B
| $643K | ﹤0.01% |
+31,382
| New | +$683K |
|
2354
PUT
QuinStreet
QNST
$870M
| $643K | ﹤0.01% |
511
+399
| +356% | +$5.44K |
|
2355
PUT
Appian
APPN
$1.74B
| $641K | ﹤0.01% |
135
-11
| -8% | -$515 |
|
2356
CALL
Mercury Systems
MRCY
$6.2B
| $641K | ﹤0.01% |
79
+24
| +44% | +$1.9K |
|
2357
Targa Resources
TRGP
$60.4B
| $641K | ﹤0.01% |
+15,981
| New | +$610K |
|
2358
CALL
Anterix
ATEX
$1.83B
| $640K | ﹤0.01% |
+177
| New | +$7.46K |
|
2359
PUT
FMC
FMC
$1.42B
| $640K | ﹤0.01% |
74
-132
| -64% | -$11.3K |
|
2360
PUT
T. Rowe Price
TROW
$25B
| $639K | ﹤0.01% |
56
-111
| -66% | -$12.4K |
|
|
LADR
2361
CALL
Ladder Capital
LADR
$1.25B
| $638K | ﹤0.01% |
370
+359
| +3,264% | +$6.07K |
|
2362
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| – | – |
0
| – | – |
|
2363
CALL
Boston Properties
BXP
$11B
| $635K | ﹤0.01% |
49
-12
| -20% | -$1.56K |
|
2364
MGIC Investment
MTG
$6.27B
| $635K | ﹤0.01% |
50,486
+48,202
| +2,110% | +$622K |
|
2365
CALL
DHT Holdings
DHT
$2.97B
| $634K | ﹤0.01% |
1,031
+889
| +626% | +$5.11K |
|
2366
CALL
Moody's
MCO
$81.7B
| $634K | ﹤0.01% |
31
+22
| +244% | +$4.61K |
|
|
WDR
2367
CALL
DELISTED
Waddell & Reed Financial, Inc.
WDR
| $633K | ﹤0.01% |
369
+317
| +610% | +$5.31K |
|
2368
ING
ING
$93.8B
| $632K | ﹤0.01% |
60,483
-90,293
| -60% | -$950K |
|
2369
Waste Management
WM
$95.9B
| $632K | ﹤0.01% |
5,497
-13,774
| -71% | -$1.61M |
|
2370
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.28B
| $630K | ﹤0.01% |
+16,707
| New | +$624K |
|
2371
CALL
GameStop
GME
$9.5B
| $630K | ﹤0.01% |
4,572
-1,576
| -26% | -$1.7K |
|
2372
US Foods
USFD
$21.4B
| $629K | ﹤0.01% |
+15,316
| New | +$591K |
|
2373
PUT
Boot Barn
BOOT
$4.55B
| $628K | ﹤0.01% |
180
+95
| +112% | +$3.16K |
|
2374
PUT
Jack in the Box
JACK
$278M
| $628K | ﹤0.01% |
69
-27
| -28% | -$2.25K |
|
2375
PUT
Cadence Design Systems
CDNS
$90B
| $627K | ﹤0.01% |
95
-35
| -27% | -$2.46K |
|
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.