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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2576
CALL
Omeros
OMER
$709M
| $44K | ﹤0.01% |
194
-1
| -0.5% | -$19 |
|
2577
PUT
RTX Corp
RTX
$287B
| $44K | ﹤0.01% |
3,640
-2,441
| -40% | -$185K |
|
2578
PUT
Sarepta Therapeutics
SRPT
$1.66B
| $44K | ﹤0.01% |
1,206
+218
| +22% | +$11.5K |
|
2579
PUT
LendingTree
TREE
$544M
| $44K | ﹤0.01% |
324
+63
| +24% | +$17.9K |
|
|
UNIT
2580
CALL
Uniti Group
UNIT
$2.63B
| $44K | ﹤0.01% |
843
+410
| +95% | +$6.76K |
|
2581
PUT
VeriSign
VRSN
$25.3B
| $44K | ﹤0.01% |
444
+289
| +186% | +$32.3K |
|
|
CMRX
2582
PUT
DELISTED
Chimerix, Inc.
CMRX
| $44K | ﹤0.01% |
+227
| New | +$1.08K |
|
|
ATCO
2583
PUT
DELISTED
Atlas Corp.
ATCO
| $44K | ﹤0.01% |
393
+51
| +15% | +$333 |
|
|
NEOS
2584
CALL
DELISTED
Neos Therapeutics, Inc
NEOS
| $44K | ﹤0.01% |
+174
| New | +$1.67K |
|
|
MCEP
2585
DELISTED
Mid-Con Energy Partners, LP
MCEP
| $44K | ﹤0.01% |
+1,886
| New | +$41K |
|
|
ELLI
2586
DELISTED
Ellie Mae Inc
ELLI
| $44K | ﹤0.01% |
497
-58
| -10% | -$5.13K |
|
2587
CALL
Archer Daniels Midland
ADM
$41.4B
| $43K | ﹤0.01% |
738
-474
| -39% | -$19.5K |
|
2588
CALL
Adient
ADNT
$1.6B
| $43K | ﹤0.01% |
311
-263
| -46% | -$21.2K |
|
2589
CALL
ATI
ATI
$27B
| $43K | ﹤0.01% |
182
-192
| -51% | -$4.57K |
|
2590
PUT
Best Buy
BBY
$18B
| $43K | ﹤0.01% |
793
-1,100
| -58% | -$65.1K |
|
|
BPMC
2591
CALL
DELISTED
Blueprint Medicines
BPMC
| $43K | ﹤0.01% |
37
+7
| +23% | +$493 |
|
2592
Cracker Barrel
CBRL
$1.2B
| $43K | ﹤0.01% |
+273
| New | +$42.8K |
|
2593
Compugen
CGEN
$216M
| $43K | ﹤0.01% |
17,479
+17,213
| +6,471% | +$51.2K |
|
2594
PUT
Genesco
GCO
$396M
| $43K | ﹤0.01% |
1,000
+967
| +2,930% | +$26.6K |
|
2595
PUT
Goodyear
GT
$2.07B
| $43K | ﹤0.01% |
933
-9
| -1% | -$286 |
|
2596
CALL
ICICI Bank
IBN
$106B
| $43K | ﹤0.01% |
+639
| New | +$5.89K |
|
2597
CALL
Lesaka Technologies
LSAK
$388M
| $43K | ﹤0.01% |
228
+145
| +175% | +$1.47K |
|
2598
Mitek Systems
MITK
$762M
| $43K | ﹤0.01% |
+4,884
| New | +$44.5K |
|
2599
CALL
Post Holdings
POST
$4.12B
| $43K | ﹤0.01% |
454
-214
| -32% | -$11.4K |
|
2600
VanEck Rare Earth/Strategic Metals ETF
REMX
$2.03B
| $43K | ﹤0.01% |
484
-121
| -20% | -$10.1K |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.