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 | |
|---|---|---|---|---|---|---|
4201
CALL
Glaukos
GKOS
$9.49B
| $112K | ﹤0.01% |
18
+8
| +80% | +$563 |
|
|
OPLN
4202
PUT
Openlane
OPLN
$4.28B
| $112K | ﹤0.01% |
+56
| New | +$1.43K |
|
4203
PUT
Medallion Financial
MFIN
$230M
| $112K | ﹤0.01% |
176
+162
| +1,157% | +$874 |
|
4204
CALL
NMI Holdings
NMIH
$3.37B
| $112K | ﹤0.01% |
43
+23
| +115% | +$629 |
|
4205
Telephone and Data Systems
TDS
$3.87B
| $112K | ﹤0.01% |
+4,352
| New | +$121K |
|
|
NSTG
4206
CALL
DELISTED
NanoString Technologies, Inc.
NSTG
| $112K | ﹤0.01% |
52
+46
| +767% | +$1.22K |
|
|
AKS
4207
DELISTED
AK Steel Holding Corp
AKS
| $112K | ﹤0.01% |
49,570
+34,476
| +228% | +$82.8K |
|
|
MTSC
4208
DELISTED
MTS Systems Corp
MTSC
| $112K | ﹤0.01% |
+2,035
| New | +$116K |
|
4209
PUT
BCE
BCE
$20.8B
| $111K | ﹤0.01% |
23
+15
| +188% | +$702 |
|
4210
CALL
Emcor
EME
$29.9B
| $111K | ﹤0.01% |
13
-69
| -84% | -$5.87K |
|
4211
PUT
Hain Celestial
HAIN
$44.6M
| $111K | ﹤0.01% |
52
+4
| +8% | +$84 |
|
4212
PUT
Standard Motor Products
SMP
$902M
| $111K | ﹤0.01% |
23
+10
| +77% | +$458 |
|
|
VRNT
4213
PUT
DELISTED
Verint Systems
VRNT
| $111K | ﹤0.01% |
51
-192
| -79% | -$5.11K |
|
4214
Voyager Therapeutics
VYGR
$181M
| $111K | ﹤0.01% |
6,499
-17,398
| -73% | -$365K |
|
|
ADVM
4215
PUT
DELISTED
Adverum Biotechnologies
ADVM
| $110K | ﹤0.01% |
20
+19
| +1,900% | +$2.14K |
|
4216
Teucrium Sugar Fund
CANE
$74M
| $110K | ﹤0.01% |
+16,525
| New | +$111K |
|
4217
CarGurus
CARG
$3.34B
| $110K | ﹤0.01% |
3,556
+523
| +17% | +$17.8K |
|
|
JMIA
4218
Jumia Technologies
JMIA
$708M
| $110K | ﹤0.01% |
+13,995
| New | +$217K |
|
4219
CALL
Kennametal
KMT
$2.56B
| $110K | ﹤0.01% |
36
-64
| -64% | -$2.04K |
|
4220
PUT
KNOT Offshore Partners
KNOP
$354M
| $110K | ﹤0.01% |
58
+51
| +729% | +$973 |
|
|
MFA
4221
MFA Financial
MFA
$932M
| $110K | ﹤0.01% |
3,746
-5,053
| -57% | -$147K |
|
4222
Newmark Group
NMRK
$2.64B
| $110K | ﹤0.01% |
12,177
+11,009
| +943% | +$102K |
|
4223
Range Resources
RRC
$9.33B
| $110K | ﹤0.01% |
+28,840
| New | +$138K |
|
4224
PUT
Texas Roadhouse
TXRH
$13.7B
| $110K | ﹤0.01% |
21
-293
| -93% | -$15.5K |
|
4225
CALL
W&T Offshore
WTI
$525M
| $110K | ﹤0.01% |
254
+213
| +520% | +$974 |
|
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.