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 | |
|---|---|---|---|---|---|---|
2451
Conduent
CNDT
$230M
| $583K | ﹤0.01% |
93,767
+69,435
| +285% | +$537K |
|
|
TPH
2452
DELISTED
Tri Pointe Homes
TPH
| $583K | ﹤0.01% |
+38,820
| New | +$529K |
|
2453
PUT
Harrow
HROW
$1.43B
| $582K | ﹤0.01% |
1,037
-149
| -13% | -$976 |
|
2454
CALL
ING
ING
$93.8B
| $582K | ﹤0.01% |
557
-818
| -59% | -$8.6K |
|
2455
CALL
Insperity
NSP
$1.85B
| $581K | ﹤0.01% |
59
+18
| +44% | +$1.95K |
|
2456
PUT
PDF Solutions
PDFS
$2.13B
| $581K | ﹤0.01% |
445
-12
| -3% | -$151 |
|
|
ARNA
2457
PUT
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $581K | ﹤0.01% |
127
+105
| +477% | +$5.9K |
|
2458
Funko
FNKO
$323M
| $580K | ﹤0.01% |
+28,235
| New | +$653K |
|
2459
CALL
Home BancShares
HOMB
$6.21B
| $580K | ﹤0.01% |
309
+308
| +30,800% | +$5.76K |
|
2460
PUT
NMI Holdings
NMIH
$3.25B
| $580K | ﹤0.01% |
221
+212
| +2,356% | +$5.8K |
|
|
UFS
2461
CALL
DELISTED
DOMTAR CORPORATION (New)
UFS
| $580K | ﹤0.01% |
162
-109
| -40% | -$4.05K |
|
2462
First Bancorp
FBP
$4.4B
| $579K | ﹤0.01% |
+58,071
| New | +$589K |
|
2463
PUT
Guidewire Software
GWRE
$11.5B
| $579K | ﹤0.01% |
55
-143
| -72% | -$14.4K |
|
2464
PUT
KKR & Co
KKR
$89.2B
| $579K | ﹤0.01% |
216
+176
| +440% | +$4.64K |
|
|
SUM
2465
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $579K | ﹤0.01% |
265
-925
| -78% | -$18.3K |
|
2466
Gold Fields
GFI
$29.2B
| $578K | ﹤0.01% |
+117,549
| New | +$640K |
|
2467
CALL
BWX Technologies
BWXT
$16B
| $577K | ﹤0.01% |
101
+90
| +818% | +$5.03K |
|
2468
CareDx
CDNA
$1.92B
| $577K | ﹤0.01% |
25,530
+24,379
| +2,118% | +$675K |
|
2469
PUT
GDS Holdings
GDS
$6.34B
| $577K | ﹤0.01% |
144
+104
| +260% | +$4.19K |
|
2470
ProShares Ultra Bloomberg Crude Oil
UCO
$457M
| $577K | ﹤0.01% |
+5,701
| New | +$640K |
|
2471
PUT
Alaunos Therapeutics
TCRT
$4.74M
| $576K | ﹤0.01% |
9
+2
| +29% | +$1.59K |
|
|
MRO
2472
DELISTED
Marathon Oil Corporation
MRO
| $576K | ﹤0.01% |
+46,976
| New | +$607K |
|
|
HOME
2473
DELISTED
At Home Group Inc.
HOME
| $576K | ﹤0.01% |
59,963
+7,071
| +13% | +$48.3K |
|
|
ANSS
2474
CALL
DELISTED
Ansys
ANSS
| $575K | ﹤0.01% |
26
-1
| -4% | -$211 |
|
2475
Direxion Daily S&P Oil & Gas Exp. & Prod. Bear 2X ETF
DRIP
$103M
| $575K | ﹤0.01% |
88
+24
| +38% | +$168K |
|
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.